Hsu, Chen-Chih (2020) Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/6T02-4X35.
Graphene, a single layer of carbon atoms forming a honeycomb lattice structure, has been considered a wonder material for both scientific research and technological applications. Structural distortions in nano-materials can induce dramatic changes in their electronic properties. In particular, strained graphene can result in both charging effects and pseudo-magnetic fields, so that controlled strain on a perfect graphene lattice can be tailored to yield desirable electronic properties.
In the first part of this thesis (Chapter 2 to 5), we explore a new approach to manipulating the topological states in monolayer graphene via nanoscale strain engineering. By placing strain-free monolayer graphene on architected nanostructures to induce global inversion symmetry breaking, we demonstrate the development of giant pseudo-magnetic fields, global valley polarization, and periodic one-dimensional topological channels for protected propagation of chiral modes in strained graphene. We have also observed pseudo-magnetic field-induced quantum oscillations and valley Hall signals, including quantum valley Hall effect, by transport measurements at 1.8K.
The second part of this thesis focuses on the development and applications of other graphene-based nanostructures. We report PECVD techniques for the synthesis of various graphene and graphene-based nanostructures, including horizontal growth of graphene sheets, vertical growth of graphene nanostructures such as graphene nanostripes with large aspect ratios, and direct and selective deposition of multi-layer graphene on nanostructured substrates. By properly controlling the gas environment of the plasma, it is found that no active heating is necessary for the PECVD growth processes and that high-yield growth can take place in a single step on a variety of surfaces, including metallic, semiconducting, and insulating materials.
Item Type:
Thesis (Dissertation (Ph.D.))
Subject Keywords:
Graphene; strain; pseudomagnetic field; valley hall effect; valleytronics; graphene nanostripes
Degree Grantor:
California Institute of Technology
Division:
Physics, Mathematics and Astronomy
Major Option:
Physics
Thesis Availability:
Public (worldwide access)
Research Advisor(s):
Thesis Committee:
Defense Date:
16 December 2019
Record Number:
CaltechTHESIS:03172020-153749505
Persistent URL:
DOI:
10.7907/6T02-4X35
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Description
DOI
Article adapted for Chapters 2 and 3.
DOI
Article adapted for Chapters 2 and 4.
DOI
Article adapted for Chapters 3 and 7.
DOI
Article adapted for Chapter 6.
Author
ORCID
Hsu, Chen-Chih
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Superconducting Proximity Effect in Graphene
dc.contributor.advisor
Kim, Philip
dc.contributor.author
Huang, Ko-Fan
dc.date.accessioned
2020-10-16T14:31:28Z
dc.date.created
2020-05
dc.date.issued
2020-05-14
dc.date.submitted
2020
dc.identifier.citation
Huang, Ko-Fan. 2020. Superconducting Proximity Effect in Graphene. Doctoral dissertation, Harvard University, Graduate School of Arts & Sciences.
Graphene is a popular candidate when it comes to the study of the superconductivity proximity effect. However, experiments have mainly been focusing on the transport behavior in two-terminal Josephson junctions. This dissertation presents unconventional transport experiments which study aspects of the proximity effect that were previously unexplored. The first experiment investigates systematically the graphene (G) - superconductor (S) hybrid system with a controllable interfacial barrier strength. We demonstrate how the Andreev process can be modulated by the magnetic field and the carrier density in graphene. The second study focuses on the multi-terminal S-G-S junction with a loop which hosts Andreev bound states (ABS) in higher dimensions. Under specific voltage configurations, we are able to capture the elusive quartet-- a state composed of four entangled electrons that is responsible for nonlocal supercurrents. With the Josephson junction biased, the system becomes periodically driven and is analyzed in the framework of Floquet theory. The associated dynamical energy spectrum can be modified with gate control and probed via a phase difference achieved by flux threaded through the device loop. Altogether, we have opened up new possibilities for the manipulation of Andreev bound states, creating a playground potentially for topological states.
Supercapacitors are the promising next-generation energy storage devices that bridge the gap between traditional capacitors and batteries, but still require their electrode material to be further developed. Here, this thesis aims at design and development of the graphene-based porous structures as the supercapacitor electrode for efficient electrochemical energy storage. Step-by-step research is carried out by firstly investigating the effect of graphene-oxide precursors, then enhancing the specific capacitance of a single electrode, and finally increasing the overall performance (in terms of the energy density and power density) at the entire device level. The details of these three main work in the PhD project are as follows: (1) Graphene-based materials are highly desirable for supercapacitors, but vary considerably in reported properties despite being prepared by similar procedures; therefore, a clear route to improve the performance is currently lacking. Here, a direct correlation between the initial oxidation of graphene-oxide precursors and final supercapacitor performance is demonstrated. Building on this significant understanding, the optimized three-dimensional graphene frameworks achieve a superior gravimetric capacitance of 330 F g-1 in an aqueous electrolyte. This extraordinary performance is also validated in various electrolytes at a device level. In a commercially used organic electrolyte, an excellent volumetric energy density of 51 Wh L-1 can be delivered, which significantly outperforms the state-of-the-art commercial carbon-based devices. Furthermore, solid-state supercapacitor with a gel electrolyte shows an impressive capacitance of 285 F g-1 with a rate capability of 79% at 20 A g-1 and capacitance retention of 93% after 20,000 cycles. This study presents a versatile design principle for engineering chemically derived graphene towards diverse applications in energy storage. (2) Graphene-oxide (GO) based porous structures are highly desirable for supercapacitors, as the charge storage and transfer can be enhanced by advancement in the synthesis. Here, this study presents an effective route of, first, synthesis of a three dimensional assembly of GO sheets in a spherical architecture by flash-freezing of GO dispersion, and then development of hierarchical porous graphene networks by facile thermal-shock reduction of GO spheres. Thus, this process leads to a superior gravimetric specific capacitance of ~306 F g−1 at 1.0 A g−1, with a capacitance retention of 93% after 10,000 cycles. The values represent a significant capacitance enhancement by 30–50% compared with the GO powder equivalent, and are among the highest reported for GO-based structures from different chemical reduction routes. Furthermore, a solid-state flexible supercapacitor is fabricated by constructing the porous graphene networks with polymer gel electrolyte, exhibiting an excellent areal specific capacitance of 220 mF cm−2 at 1.0 mA cm−2 with exceptional cyclic stability. The work reveals the synthetic and further processing effects of GO-based materials to enhance their structure-performance relationships for capacitive energy storage. (3) Supercapacitors have shown extraordinary promise for miniaturized electronics and electric vehicles, but are usually limited by electrodes with rather low volumetric performance largely due to the inefficient utilization of pores in charge storage. Herein, this study designs a freestanding graphene laminate film electrode with highly efficient pore-utilization for compact capacitive energy storage. The interlayer spacing of this film can be precisely adjusted, which enables a tunable porosity. By systematically tailoring the pore size for the electrolyte ions, pores are utilized optimally and thereby the volumetric capacitance is maximized. Consequently, the fabricated supercapacitor delivers a record-high stack volumetric energy density of 88.1 Wh L-1 in an ionic liquid electrolyte, representing a critical breakthrough for optimizing the porosity towards compact energy storage. Moreover, the optimized film electrode is assembled into an ionogel-based all-solid-state flexible smart device with multiple optional output and superior stability, demonstrating enormous potential as portable power supply in practical applications.
Type:
Thesis (Doctoral)
Qualification:
Ph.D
Title:
Design of graphene-based structures for capacitive energy storage
Event:
UCL (University College London)
Open access status:
An open access version is available from UCL Discovery
Graphene-semiconductor heterojunctions and devices public deposited.
In this thesis we explore the potential of versatile graphene-semiconductor heterojunctions in photodetection and field-effect transistor (FET) applications.
The first part of the thesis studies near-infrared photodiode (NIR PD) based on a graphene- n-Si heterojunction in which graphene is used as the absorbing medium. Graphene is chosen for its absorption in NIR wavelengths to which Si is not responsive. Most graphene detectors in the literature are photoconductors that have a high dark current. The graphene-Si heterojunction PD has a large Schottky barrier height that suppresses the dark current and enhances the current rectification and the photon detectivity.
The fabricated graphene-Si heterojunction PD under conventional telecommunication 1.3 (1.5)- μ m illumination exhibits a responsivity of 3 (0.2) mA/W, an internal quantum efficiency of 14 (0.6) %, a noise-equivalent power of 1.5 (30) pW/Hz 0.5 , and a specific detectivity of 3 (0.1)x10⁹ cm Hz 0.5 /W. An unexpected tunnel oxide is observed at the graphene-Si interface, further reducing the dark current. The performance in terms of sensitivity and noise is comparable to the commercially available discrete germanium NIR PDs due to its low dark current density on the order of 10 fA/ μ m 2 . The Si CMOS-compatible PD based on graphene-Si heterojunction provides a promising route to realize a critical component for monolithically integrated Si photonic interconnects.
The second part of the thesis focuses on a novel graphene junction FET (GJFET) gated by a graphene-semiconductor heterojunction. The majority of graphene transistors in the literature -- including MOSFETs, barristors, and tunneling FETs -- have a heavily-doped Si back gate separated from the graphene channel by a conventional or high-K dielectric layer. The threshold voltage of individual transistors cannot be tuned easily in such designs, and have an additional problem with shorted back gates. In GJFETs, a Schottky junction is formed as graphene is placed on a semi conductor, resulting in a depletion region inside the semiconductor that induces a complementary charge in the graphene. Changing the reverse bias across the graphene-semiconductor junction modulates the depletion region width and thereby changes the total charge in graphene. The charge density of the graphene is also modulated by the doping density of the semiconductor substrate. The GJFET structure provides a solution for Dirac voltage tuning and back gate isolation by location-specific doping on a single device wafer.
A detailed understanding of the device is obtained through the design, fabrication, and analysis of GJFETs with atmospheric pressure chemical-vapor deposited graphene on n-type Si and 4H-SiC substrates of various doping densities. A variable depletion width model is built to numerically simulate the performance. A representative n-Si (4.5x10 15 cm -3 ) GJFET exhibits an on-off ratio of 3.8, an intrinsic hole density of 8x10 11 cm -2 , and a Dirac voltage of 14.1 V. Fitting the transfer characteristic of the Si GJFET with our device model yields an electron and hole mobility of 300 and 1300 cm 2 /V·s respectively. The tunability of the threshold voltage by varying the substrate doping density is also demonstrated. With an increasing substrate doping from 8x10 14 to 2x10 16 cm -3 , the threshold of the Si GJFET decreases from 24.9 V to 3.8 V. With even higher doping density (5x10 18 cm -3 ) in n + -4H-SiC, the Dirac voltage of the GJFET is further reduced to 1.5 V. These results also demonstrate the feasibility of integrating GJFET with semiconductor substrates other than Si, widening their potential for use in high-frequency electronics.
Ou, Tzu-Min
Electrical, Computer and Energy Engineering (ECEE)
Quantized heat flow as a probe of thermal equilibration and edge structures of quantum Hall phases in graphene
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Saurabh Kumar Srivastav 0
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
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Reports the first experiments on quantized heat flow in graphene
Nominated as an outstanding PhD theses by the Indian Institute for Science
Provides a detailed introduction on the electronic properties of graphene in zero and quantizing magnetic field
Part of the book series: Springer Theses (Springer Theses)
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About this book.
This book describes the quantized thermal conductance measurements of integer and several fractional quantum Hall (QH) states realized in graphene devices. Although the electrical conductance quantization of the QH effect in graphene was demonstrated in 2005, a heat flow study of QH states needed to be included. This becomes particularly essential for the hole-conjugate fractional QH phases, where counterpropagating edge modes lead to complex transport behavior. The experimental results reported in this thesis are the first set of experiments done for the quantized heat flow in graphene devices since the first mechanical isolation of graphene flakes. The book devotes two detailed introductory chapters to the electronic properties of the graphene and its bilayer and trilayer parts at zero magnetic fields, and to the essential physics of the integer and fractional quantum Hall (FQH) states, the topological order of FQH phases and the experiments that can detect them.
The book has a dedicated chapter for the details of the device fabrication and thermal conductance measurement technique. The rest of the chapters are dedicated to the systematic and detailed documentation of the new experimental findings of quantized heat flow in quantum Hall phases in graphene.
fractional quantum Hall states
Integer quantum Hall states
Quantized Heat flow
graphene devices
Thermal Noise
Thermal equilibration
Topological orders
Edge states
Upstream modes
Neutral modes
Authors and Affiliations
Saurabh Kumar Srivastav
About the author
Bibliographic information.
Book Title : Quantized heat flow as a probe of thermal equilibration and edge structures of quantum Hall phases in graphene
Authors : Saurabh Kumar Srivastav
Series Title : Springer Theses
Publisher : Springer Cham
eBook Packages : Physics and Astronomy , Physics and Astronomy (R0)
Copyright Information : The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2024
Hardcover ISBN : 978-3-031-67050-3 Due: 09 September 2024
Softcover ISBN : 978-3-031-67053-4 Due: 09 September 2024
eBook ISBN : 978-3-031-67051-0 Due: 09 September 2024
Series ISSN : 2190-5053
Series E-ISSN : 2190-5061
Edition Number : 1
Number of Illustrations : 6 b/w illustrations
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Ngei K. (2016). “Characterization And Performance Evaluation Of Graphene Films As Counter Electrodes For Dye Sensitized Solar Cells”. Unpublished Thesis, Juja: JKUAT .
has been cited by the following article:
Enhancing the Performance of Titanium Dioxide Compact Layer on Epitaxial Graphene and Fluorine Tin Oxide Heterojunctions
1 Department of Physics, Jomo Kenyatta University of Agriculture and Technology Nairobi, Kenya
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Title: electrical switching of chirality in rhombohedral graphene chern insulators.
Abstract: A Chern insulator hosts topologically protected chiral edge currents with quantized conductance characterized by its Chern number. Switching the chirality of the Chern insulator, namely, the direction of the edge current, is highly challenging due to topologically forbidden backscattering but is of considerable importance for the design of topological devices. Nevertheless, this can be achieved by reversing the sign of the Chern number through a topological phase transition. Here, we report electrically switchable chirality in rhombohedral heptalayer graphene-based Chern insulators. The surface flat band and giant Berry curvature in rhombohedral multilayer graphene provide a highly tunable platform for engineering the topological states. By introducing moire superlattices in rhombohedral heptalayer graphene, we observed a cascade of topological phase transitions at quarter electron filling of a moire band. The Chern number can be continuously tuned from 0, -1, 1 to 2 by electric fields, manifesting as a large anomalous Hall effect and following Streda's formula. Sign reversal and the anomalous Hall effect also occurred at non-integer fillings, suggesting the possibility of electrically tunable topological phase transitions within the regime of fractional Chern insulators. Our work establishes rhombohedral heptalayer graphene moire superlattices as a versatile platform for topological engineering. The realization of switchable chirality enhances the potential application of chiral edge currents in topological circuit interconnects.
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Technology, Applications & Opportunities November 20 - 21, 2019 2019-11-20 2019-11-21 | Santa Clara Convention Center, CA, USA
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Why Graphene & 2D Materials USA 2019?
Focus on commercial progress, real application development, and commercially-relevant innovation
Connect suppliers and customers from a variety of end user industries
Accelerate value chain creation by co-hosting suppliers, intermediary compounders/formulators, end users
Cross-fertilize business by co-locating with highly synergetic events such as printed electronics, wearable technologies, electric vehicles and 3D printing
Analyst-designed agenda and networking opportunities
What is Graphene & 2D Materials?
The graphene industry is going through an interesting period. The number of suppliers has grown, resulting in increased production capacity worldwide. There is continued appetite for investment and the end user interest in graphene and its potential grows surprisingly fast. End users from many industries now want to evaluate graphene and suppliers are increasingly building up very robust pipelines.
The go-to-market strategy is still largely based on substituting existing materials. Here, graphene is still in the realm of offering more for more (or the same at the best) although a more-for-same value proposition may soon be reached if cost reductions exceed their current rapid trajectory.
The first wave of products have already hit the markets. Most are small volumes and somewhat gimmicky, capitalising on the good brand of 'graphene'. The best however is to yet to come as new applications steadily make their way through the long and winding qualification tunnels.
IDTechEx Show!
Graphene & 2D Materials is part of the IDTechEx Show! and co-located alongside a series of synergistic events on electric vehicles, energy storage, internet of things, printed electronics, sensors and wearable. Each of these is a full two-day executive conference, co-located with a common exhibition. We co-locate these events because there is strong overlap across these topics, exposing you to the full relevant supply chains and customer and supplier bases, saving you time and money from attending separate events.
Experience the event
North America's largest event on graphene
Demonstration Street
An area in the exhibition dedicated to showing a full range of interactive products and prototypes.
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Hear market and technology insight from users, suppliers and academics at the conference.
End-user Forum
Learn what users need through a diverse range of case studies and question a panel of end-users on their needs and experiences.
Masterclasses
Clear the confusion with impartial technical and market insight from experts in interactive consultancy-style sessions.
Company Tours
Take advantage of being in Silicon Valley, an area of excellence for these technologies, and attend a tour to local leading organizations.
1-to-1 Strategic Help
Arrange a 1-to-1 meeting with technical and business analysts in order to help you understand the topic and your opportunities.
Relevant conference topics and co-located exhibition - over 3500 people in total.
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See live demonstrators from early stage companies.
What attendees say about this event
It was a meaningful and very informative event, a good opportunity to understand the current global trend of graphene and its application. Incubation Alliance
This event was a good combination of application-related conference talks and the opportunity for in-depth discussions at the exhibition booths. Infineon
The event presented the latest developments in commercial applications of graphene & provided a unique platform to help create the value chains. Tata Steel
A great opportunity to network with a R&D, start-up and end-user company, all in the same day. Decathlon
The Printed Electronics USA show was very successful for our company. We were met with great interest and already know after one week that several of the potential customers we met are very serious. Thank you IDTechEx for your good organization and service. DB Patterning
We thoroughly enjoyed this year's event. The conferences were very informative and we were exposed to plenty of new and exciting technologies that we believe can help our company reach the next level. Looking forward to next year. GGI International
For Printed Electronics, there is no other event that holds a candle to this one. Kodak
This event is really focused on real things, real devices and people are focused on concrete business. Thales
It was the most business oriented graphene and nanotechnology conference that we have attended. We have made many contacts and also partners. Advanced Graphene Products
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Lyten secures $4 million u.s. department of energy grant to accelerate commercialization of high-capacity, long cycle-life lithium-sulfur batteries.
The U.S. Department of Energy is investing in lithium-sulfur battery chemistry as part of a strategy to support technologies that can alleviate supply chain concerns for EV batteries and increase EV driving range.
SAN JOSE, Calif., January 30, 2024 --( BUSINESS WIRE )--Lyten, Inc., a supermaterial applications company and leader in 3D Graphene materials, announced today it has secured a $4 million grant from the U.S. Department of Energy (DoE) to accelerate the manufacturing of its advanced lithium-sulfur battery technology.
The grant, awarded by the DoE’s Energy Efficiency and Renewable Energy / Vehicle Technologies Office, specifically targets lithium-sulfur technologies that can alleviate offshore supply chain risk for EV batteries and increase EV driving range. Utilizing abundantly available and low-cost sulfur, the lithium-sulfur chemistry has the potential to deliver greater than twice the energy density of lithium-ion NMC (nickel, manganese, cobalt) chemistries. Additionally, the chemistry does not require critical minerals such as nickel and cobalt in the cathode or graphite in the anode, enabling a locally sourced, locally manufactured EV battery.
The DoE grant awards for lithium-sulfur follow the passage of National Defense Authorization Act, signed into law last month with bi-partisan support, which will prohibit the U.S. Defense Department from buying batteries produced by China’s largest manufacturers starting in October 2027. This ban reinforces the urgency to accelerate the development and rapid scale up of rechargeable cells with alternative battery chemistries, like lithium-sulfur, that offer localized supply chains for strategic defense applications and high energy density to support mobility and transportation electrification.
"We are encouraged by both the Department of Defense and Department of Energy’s support for alternative battery technologies, in particular breakthrough technologies like lithium-sulfur that are critical to establishing energy security and supply chain independence," said Dan Cook, CEO and co-founder of Lyten. "The U.S. has an opportunity to gain the lead in technological breakthroughs necessary to overcome barriers holding back mass scale electrification."
The DoE award is supporting both private industry and university research as part of this round of funding for lithium-sulfur. For this grant, Lyten is working with Stanford University, the University of Texas-Austin, and industrial partner Arcadium Lithium (formed via merger of Livent and Allkem). Separately, Lyten is a subrecipient on a DoE grant awarded to Purdue University to improve modeling capabilities for lithium-sulfur cells.
Lithium-sulfur is a chemistry known for decades to potentially hold two to three times the energy density of lithium-ion but was not envisioned to come into the market until the 2030s due to material science challenges. Lyten has accelerated this timeline by using its 3D Graphene material to develop a sulfur-graphene composite cathode. In June 2023, Lyten opened a semi-automated, lithium-sulfur pilot line producing pouch and cylindrical cells on its 145,000-square-foot campus in Silicon Valley and will begin to deliver non-EV cells commercially in 2024.
In 3Q 2023, Lyten announced it had raised $200 million through a Series B round, bringing total investment up to $410 million to scale 3D Graphene applications and lithium-sulfur battery manufacturing. Lyten investors include a broad range of industry leaders, including Stellantis (third-largest auto manufacturer in the world), FedEx, Honeywell, and Walbridge.
Lyten Lyten is a supermaterial applications company. Lyten’s proprietary processes permanently sequester carbon from methane in the form of 3D Graphene and utilize the tunable supermaterial to develop decarbonizing applications. Lyten is currently commercializing next-generation lithium-sulfur batteries for use in the automotive, aerospace, defense, and other markets; a next-generation polymer composite that can reduce the amount of plastic used by up to half while maintaining structural and impact strength; and next-generation sensors that significantly increase detection sensitivity and selectivity for use in automotive, industrial, health, and safety applications.
Lyten is led by a group of experienced executives from across Automotive, Energy, Batteries, Semiconductors, Manufacturing and Defense, lists more than 410 patent matters, and is currently manufacturing Lyten 3D Graphene material and its applications in San Jose, California. Lyten was founded in 2015. For more information, visit https://lyten.com .
View source version on businesswire.com: https://www.businesswire.com/news/home/20240130889450/en/
(PDF) Thesis Title: Fabrication and Characterization of CVD Graphene
1: Schematic representation of an isolated graphene sheet [163
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Physics and Applications of Graphene-Based Nanostructures and Nano-Meta
Abstract. Graphene, a single layer of carbon atoms forming a honeycomb lattice structure, has been considered a wonder material for both scientific research and technological applications. Structural distortions in nano-materials can induce dramatic changes in their electronic properties. In particular, strained graphene can result in both ...
Graphene-metal interactions beyond Van der Waals forces
This thesis aims to provide insights into graphene-metal interactions by analyze novel phenomena and develop practical applications. First, we modified the graphene-copper interface to prevent the growths of thicker graphene islands in order to grow a uniform bilayer graphene (2LG), by introducing the concept of interface adhesive energy.
Synthesis, Processing, and Electrical Characterization of Graphene
scalable graphene synthesis techniques such as chemical vapor deposition (CVD), as well as the subsequent fabrication of graphene devices. This thesis establishes and investigates the procedures for fabricating graphene devices from beginning to end. It begins with a study of the graphene synthesis process by CVD on freestanding copper foils.
Superconducting Proximity Effect in Graphene
dc.description.abstract. Graphene is a popular candidate when it comes to the study of the superconductivity proximity effect. However, experiments have mainly been focusing on the transport behavior in two-terminal Josephson junctions. This dissertation presents unconventional transport experiments which study aspects of the proximity effect ...
Graphene synthesis, characterization and its applications: A review
Graphene is a carbon nanomaterial made of two-dimensional layers of a single atom thick planar sheet of sp 2-bonded carbon atoms packed tightly in a honeycomb lattice crystal [13], [17].Graphene's structure is similar to lots of benzene rings jointed where hydrogen atoms are replaced by the carbon atoms Fig. 1 a and is considered as hydrophobic because of the absence of oxygen groups [10].
Graphene research and their outputs: Status and prospect
Abstract. Among various 2D materials, graphene has received extensive research attention in the last 2-3 decades due to its fascinating properties. The discovery of graphene provided an immense boost up and new dimension to materials research and nanotechnology. The multidisciplinary characteristics of graphene havea wide range of applications ...
Design of graphene-based structures for capacitive energy storage
Here, this thesis aims at design and development of the graphene-based porous structures as the supercapacitor electrode for efficient electrochemical energy storage. Step-by-step research is carried out by firstly investigating the effect of graphene-oxide precursors, then enhancing the specific capacitance of a single electrode, and finally ...
PhD Thesis Dissertation "Graphene: FET and metal contact modeling"
The extracted v alue of the contact capacitance per unitary. width is CC= 9 38 pF mm, and its value per unitary surface is 4 68 fF/mm 2. This. value is compatible with the presence of a thin ...
Fundamental physical properties of graphene reinforced concrete
Thesis or dissertation. Publisher. University of Exeter. Degree Title. PhD in Engineering. Abstract. ... Graphene, a two-dimensional sheet of carbon atoms arranged in a hexagonal lattice, is the most promising nanomaterial for composites' reinforcement to this date, due to it's exceptional strength, ability to retain original shape after strain ...
PDF Theoretical Studies of The Epitaxial Growth of Graphene
1650 C. Regions covered by one, two, and three layers of graphene are shown as light, moderate, and dark gray, respectively. The latter two occur at SiC step edges. (b)-(d), KMC simulation images of monolayer graphene strips with E~kT=0, 5:8, and 11:6, respectively. The total coverage =0:25. Light gray lines and the right edges of graphene
Synthesis of graphene
Graphene, a two-dimensional material of sp2 hybridization carbon atoms, has fascinated much attention in recent years owing to its extraordinary electronic, optical, magnetic, thermal, and mechanical properties as well as large specific surface area. For the tremendous application of graphene in nano-electronics, it is essential to fabricate high-quality graphene in large production. There are ...
Graduate Thesis Or Dissertation
The first part of the thesis studies near-infrared photodiode (NIR PD) based on a graphene- n-Si heterojunction in which graphene is used as the absorbing medium. Graphene is chosen for its absorption in NIR wavelengths to which Si is not responsive. Most graphene detectors in the literature are photoconductors that have a high dark current.
PDF Graphene Thesis After Defense
3.1 Synthesis and functionalization of graphene 43 3.1.1 Graphene-alkyne 43 3.1.2 Graphene-TEG 44 3.1.3 Graphene-COOH 45 3.1.4 Graphene-amine 46 3.2 Characterization of functionalized grapheme 47 3.2.1 Dispersability & Morphology of f-graphene 47 3.2.2 IR spectroscopy 48 3.2.3 Thermogravimetric analysis (TGA) 49
Quantized heat flow as a probe of thermal equilibration and edge
The experimental results reported in this thesis are the first set of experiments done for the quantized heat flow in graphene devices since the first mechanical isolation of graphene flakes. The book devotes two detailed introductory chapters to the electronic properties of the graphene and its bilayer and trilayer parts at zero magnetic ...
Dissertations / Theses: 'Graphene'
Title from first page of PDF file (viewed March 12, 2010). Includes bibliographical references (p. 96-107). Also issued in print. 14 Risley, Mason J. "Surfactant-assisted exfoliation and processing of graphite and graphene." ... The work outlined in this thesis targets graphene growth on copper, however, instead of using elevated temperatures a ...
Linfield University DigitalCommons@Linfield
THESIS COPYRIGHT PERMISSIONS Please read this document carefully before signing. If you have questions about any of these permissions, please contact the DigitalCommons Coordinator. Title of the Thesis: Exploring the. Electrical Properties. of. Twisted Bilayer Graphene. Author's Name: (Last name, first name) Shannon, William. 11 . 1 . Advisor's ...
Dissertations / Theses: 'Printed Graphene'
Therefore, this thesis extends the potential of highly flexible and conductive graphene laminate to the application of electromagnetic interference (EMI) shielding. Graphene nanoflake-based conductive ink is printed on paper, and then it is compressed to form graphene laminate with a conductivity of 0.43×105 S/m.
MSc thesis
MSc thesis - Computational study of electronic band structure of twisted bilayer graphene - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
Ngei K. (2016). "Characterization And Performance Evaluation Of
We report a facile synthesis of Titanium dioxide (TiO 2) modified compact layers on Fluorine Tin oxide (FTO) and graphene employing the Sol gel Doctor Blade technique, optimized systematically for enhanced solar energy conversion applications.UV-VIS spectrophotometer, a Varian 7000e FTIR, a Scanning Kelvin Probe Microscope, and Hall Effect setup evaluated the as deposited and films subjected ...
Dissertations / Theses: 'Graphene ; Dye-sensitized solar cells
There are four parts in this thesis. First, reduced graphene oxide (RGO)/macrocyclic iron (Fe) complex hybrid materials were synthesized. This material was successfully used in counter electrodes (CEs) of dye-sensitized solar cells. The electrode properties and device efficiency based on the GO/Fe were analyzed. Results showed that DSSCs based ...
Title: Electrical switching of chirality in rhombohedral graphene Chern
A Chern insulator hosts topologically protected chiral edge currents with quantized conductance characterized by its Chern number. Switching the chirality of the Chern insulator, namely, the direction of the edge current, is highly challenging due to topologically forbidden backscattering but is of considerable importance for the design of topological devices. Nevertheless, this can be ...
Graphene USA 2020
November 18-19, 2020, Santa Clara. This event is the most commercially-focused conference and exhibition on graphene and other 2D materials. It is where companies unveil their latest technologies, launch their products, where technologists announce their latest commercially-relevant results, and where suppliers and end users from a variety of ...
Graphene USA 2017
This event will cover all promising applications of graphene, including graphene composites, supercapacitors and batteries, functional inks, logic and memory, touch screens, sensors and bio-electronics and beyond. Our audience will develop a comprehensive yet detailed understanding of the state of technology and market per graphene application area. - 10% attendee discount will expire on ...
Graphene USA 2019
November 20-21 2019, Santa Clara. This event is the most commercially-focused conference and exhibition on graphene and other 2D materials. It is where companies unveil their latest technologies, launch their products, where technologists announce their latest commercially-relevant results, and where suppliers and end users from a variety of industries directly connect.
PDF Electric fields boost graphene's potential, study shows
Title: Electric fields boost graphene's potential, study shows Subject: Electric fields boost graphene's potential, study shows Created Date: 6/21/2024 2:06:16 PM ...
Lyten Secures $4 Million U.S. Department of Energy Grant to Accelerate
SAN JOSE, Calif., January 30, 2024--Lyten, Inc., a supermaterial applications company and leader in 3D Graphene materials, announced today it has secured a $4 million grant from the U.S ...
Thesis Defense Announcement for Jagdeo Singh
Thesis title: Architecture selection and propulsion supervisory control strategies for all-wheel drive electric vehicles (EVs) When: 06/26/24 at 4:00 p.m. Where: Simrall 228 and Microsoft Teams: Meeting ID: 258 938 360 464 Passcode: 9sxXUG Candidate: Jagdeo Singh Degree: Master of Science in Electrical & Computer Engineering Committee Members: Dr. John Ball, Dr. Masoud Karimi-Ghartemani, and
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Abstract. Graphene, a single layer of carbon atoms forming a honeycomb lattice structure, has been considered a wonder material for both scientific research and technological applications. Structural distortions in nano-materials can induce dramatic changes in their electronic properties. In particular, strained graphene can result in both ...
This thesis aims to provide insights into graphene-metal interactions by analyze novel phenomena and develop practical applications. First, we modified the graphene-copper interface to prevent the growths of thicker graphene islands in order to grow a uniform bilayer graphene (2LG), by introducing the concept of interface adhesive energy.
scalable graphene synthesis techniques such as chemical vapor deposition (CVD), as well as the subsequent fabrication of graphene devices. This thesis establishes and investigates the procedures for fabricating graphene devices from beginning to end. It begins with a study of the graphene synthesis process by CVD on freestanding copper foils.
dc.description.abstract. Graphene is a popular candidate when it comes to the study of the superconductivity proximity effect. However, experiments have mainly been focusing on the transport behavior in two-terminal Josephson junctions. This dissertation presents unconventional transport experiments which study aspects of the proximity effect ...
Graphene is a carbon nanomaterial made of two-dimensional layers of a single atom thick planar sheet of sp 2-bonded carbon atoms packed tightly in a honeycomb lattice crystal [13], [17].Graphene's structure is similar to lots of benzene rings jointed where hydrogen atoms are replaced by the carbon atoms Fig. 1 a and is considered as hydrophobic because of the absence of oxygen groups [10].
Abstract. Among various 2D materials, graphene has received extensive research attention in the last 2-3 decades due to its fascinating properties. The discovery of graphene provided an immense boost up and new dimension to materials research and nanotechnology. The multidisciplinary characteristics of graphene havea wide range of applications ...
Here, this thesis aims at design and development of the graphene-based porous structures as the supercapacitor electrode for efficient electrochemical energy storage. Step-by-step research is carried out by firstly investigating the effect of graphene-oxide precursors, then enhancing the specific capacitance of a single electrode, and finally ...
The extracted v alue of the contact capacitance per unitary. width is CC= 9 38 pF mm, and its value per unitary surface is 4 68 fF/mm 2. This. value is compatible with the presence of a thin ...
Thesis or dissertation. Publisher. University of Exeter. Degree Title. PhD in Engineering. Abstract. ... Graphene, a two-dimensional sheet of carbon atoms arranged in a hexagonal lattice, is the most promising nanomaterial for composites' reinforcement to this date, due to it's exceptional strength, ability to retain original shape after strain ...
1650 C. Regions covered by one, two, and three layers of graphene are shown as light, moderate, and dark gray, respectively. The latter two occur at SiC step edges. (b)-(d), KMC simulation images of monolayer graphene strips with E~kT=0, 5:8, and 11:6, respectively. The total coverage =0:25. Light gray lines and the right edges of graphene
Graphene, a two-dimensional material of sp2 hybridization carbon atoms, has fascinated much attention in recent years owing to its extraordinary electronic, optical, magnetic, thermal, and mechanical properties as well as large specific surface area. For the tremendous application of graphene in nano-electronics, it is essential to fabricate high-quality graphene in large production. There are ...
The first part of the thesis studies near-infrared photodiode (NIR PD) based on a graphene- n-Si heterojunction in which graphene is used as the absorbing medium. Graphene is chosen for its absorption in NIR wavelengths to which Si is not responsive. Most graphene detectors in the literature are photoconductors that have a high dark current.
3.1 Synthesis and functionalization of graphene 43 3.1.1 Graphene-alkyne 43 3.1.2 Graphene-TEG 44 3.1.3 Graphene-COOH 45 3.1.4 Graphene-amine 46 3.2 Characterization of functionalized grapheme 47 3.2.1 Dispersability & Morphology of f-graphene 47 3.2.2 IR spectroscopy 48 3.2.3 Thermogravimetric analysis (TGA) 49
The experimental results reported in this thesis are the first set of experiments done for the quantized heat flow in graphene devices since the first mechanical isolation of graphene flakes. The book devotes two detailed introductory chapters to the electronic properties of the graphene and its bilayer and trilayer parts at zero magnetic ...
Title from first page of PDF file (viewed March 12, 2010). Includes bibliographical references (p. 96-107). Also issued in print. 14 Risley, Mason J. "Surfactant-assisted exfoliation and processing of graphite and graphene." ... The work outlined in this thesis targets graphene growth on copper, however, instead of using elevated temperatures a ...
THESIS COPYRIGHT PERMISSIONS Please read this document carefully before signing. If you have questions about any of these permissions, please contact the DigitalCommons Coordinator. Title of the Thesis: Exploring the. Electrical Properties. of. Twisted Bilayer Graphene. Author's Name: (Last name, first name) Shannon, William. 11 . 1 . Advisor's ...
Therefore, this thesis extends the potential of highly flexible and conductive graphene laminate to the application of electromagnetic interference (EMI) shielding. Graphene nanoflake-based conductive ink is printed on paper, and then it is compressed to form graphene laminate with a conductivity of 0.43×105 S/m.
MSc thesis - Computational study of electronic band structure of twisted bilayer graphene - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
We report a facile synthesis of Titanium dioxide (TiO 2) modified compact layers on Fluorine Tin oxide (FTO) and graphene employing the Sol gel Doctor Blade technique, optimized systematically for enhanced solar energy conversion applications.UV-VIS spectrophotometer, a Varian 7000e FTIR, a Scanning Kelvin Probe Microscope, and Hall Effect setup evaluated the as deposited and films subjected ...
There are four parts in this thesis. First, reduced graphene oxide (RGO)/macrocyclic iron (Fe) complex hybrid materials were synthesized. This material was successfully used in counter electrodes (CEs) of dye-sensitized solar cells. The electrode properties and device efficiency based on the GO/Fe were analyzed. Results showed that DSSCs based ...
A Chern insulator hosts topologically protected chiral edge currents with quantized conductance characterized by its Chern number. Switching the chirality of the Chern insulator, namely, the direction of the edge current, is highly challenging due to topologically forbidden backscattering but is of considerable importance for the design of topological devices. Nevertheless, this can be ...
November 18-19, 2020, Santa Clara. This event is the most commercially-focused conference and exhibition on graphene and other 2D materials. It is where companies unveil their latest technologies, launch their products, where technologists announce their latest commercially-relevant results, and where suppliers and end users from a variety of ...
This event will cover all promising applications of graphene, including graphene composites, supercapacitors and batteries, functional inks, logic and memory, touch screens, sensors and bio-electronics and beyond. Our audience will develop a comprehensive yet detailed understanding of the state of technology and market per graphene application area. - 10% attendee discount will expire on ...
November 20-21 2019, Santa Clara. This event is the most commercially-focused conference and exhibition on graphene and other 2D materials. It is where companies unveil their latest technologies, launch their products, where technologists announce their latest commercially-relevant results, and where suppliers and end users from a variety of industries directly connect.
Title: Electric fields boost graphene's potential, study shows Subject: Electric fields boost graphene's potential, study shows Created Date: 6/21/2024 2:06:16 PM ...
SAN JOSE, Calif., January 30, 2024--Lyten, Inc., a supermaterial applications company and leader in 3D Graphene materials, announced today it has secured a $4 million grant from the U.S ...
Thesis title: Architecture selection and propulsion supervisory control strategies for all-wheel drive electric vehicles (EVs) When: 06/26/24 at 4:00 p.m. Where: Simrall 228 and Microsoft Teams: Meeting ID: 258 938 360 464 Passcode: 9sxXUG Candidate: Jagdeo Singh Degree: Master of Science in Electrical & Computer Engineering Committee Members: Dr. John Ball, Dr. Masoud Karimi-Ghartemani, and