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Dissertations / Theses on the topic 'Metal on graphene'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Ansell, Daniel. "Graphene for enhanced metal plasmonics." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/graphene-for-enhanced-metal-plasmonics(7bb0ffb1-f46f-498e-bb88-9626021f6f58).html.

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The experimental work undertook in this thesis looks to integrate technologies developed by the graphene and plasmonics communities, respectively, for the purpose of producing devices of enhanced qualities to those of similar utility that have previously been produced. Furthermore, where possible, we look to offer disruptive innovation, by utilising coupled properties that may offer unique possibilities for applications. A hybrid graphene-plasmonic waveguide modulator is fabricated and shown to operate successfully at a standard telecommunications frequency. Different plasmonic-waveguide desig

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2

Alam, Tanvir E. "Metal Oxide Graphene Nanocomposites for Organic and Heavy Metal Remediation." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3945.

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This thesis consists of two research problems in the water decontamination area. In the first work, the main focus is to understand the structure and photocatalytic activity of titanium dioxide with graphene (G-TiO2) which is synthesized by using sol-gel method. The photocatalytic activity of TiO2 is limited by the short electron hole pair recombination time. Graphene, with high specific surface area and unique electronic properties, can be used as a good support for TiO2 to enhance the photocatalytic activity. The obtained G-TiO2 photocatalysts has been characterized by X-Ray Diffraction (XRD

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3

Teng, Die. "Computational studies of transition metal nanoclusters on metal-supported graphene moiré." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51830.

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The graphene moiré superstructure formed on Ru(0001) (g/Ru(0001)) has shown the potential as a template to self-assemble super-lattices of metal nanoparticles as model catalysts. To explore the possibility of rational catalyst design on g/Ru(0001), detailed density functional theory (DFT) calculations have been performed to investigate the adsorption and diffusion of Rh and Au adatoms on g/Ru(0001). The consequences of different hopping rates for cluster nucleation have been explored by performing Monte Carlo-based statistical analysis, which suggests that diffusing species other than adatoms

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4

Narayanan, Nair Maya. "Functionalization of epitaxial graphene by metal intercalation and molecules." Phd thesis, Université de Haute Alsace - Mulhouse, 2013. http://tel.archives-ouvertes.fr/tel-01064523.

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In this thesis, we have explored the possibilities to realize a Graphene Based Hybrid structures (GBHs) by the functionalization of a graphene layer on both sides. The first chapter gives a general introduction about graphene and a literature review of different metal intercalations on graphene. The second chapter explains the experimental techniques used in this work. In chapter 3, we studied the functionalization of epitaxial graphene on SiC(0001) by gold intercalation. With the help of Scanning Tunneling Microscopy, we have evidenced and characterized different intercalation modes such as t

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5

Vincenzi, Giancarlo. "Graphene: FET and Metal Contact Modeling. Graphène : modélisation du FET et du contact métallique." Phd thesis, Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2345/.

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Neuf ans sont passés depuis la découverte du graphène, tous très dense de travaux de recherche et publications que, petit à petit, ont mieux illuminé les propriétés de ce matériau extraordinaire. Avec une meilleure compréhension de ses meilleures qualités, une idée plus précise des applications que mieux pourront profiter de son use a été défini. Dispositifs à haute fréquence, comme mélangeurs et amplificateurs de puissance, et l'électronique Flexible et Transparent sont les domaines les plus prometteurs. Dans ces domaines une grande attention est dévouée à deux sujets : la réduction des dimen

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6

Gómez-Martínez, Melania. "Graphene-Based Materials in Metal-, Carbo- & Organocatalysis." Doctoral thesis, Universidad de Alicante, 2017. http://hdl.handle.net/10045/73630.

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Se ha estudiado la actividad catalítica de materiales derivados de grafeno como soporte de nanopartículas de paladio así como de complejos de paladio(II) en reacciones de acoplamiento carbono-carbono y carbono-heteroátomo. Así mismo, se ha llevado a cabo su actividad catalítica como carbocatalizador en diversas transformaciones orgánicas.

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7

Vo, Van Chi. "Epitaxial graphene on metal for new magnetic manometric systems." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00829379.

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Graphene is a candidate for next generation spintronics devices exploiting its long spin transport length and high carrier mobility. Besides, when put in interaction with a ferromagnet, it may become an active building block, as suggested by recent surface science studies revealing few tenth of a Bohr magneton magnetic moments held by carbon atoms in graphene on iron, and a Rashba spin-orbit splitting reaching about 10 meV in graphene on a high atomic number element such as gold. The extent to which graphene may influence the properties, e.g. magnetic ones, of the materials contacted to it was

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8

Leve, Zandile Dennis. "Determination of paracetamol at the electrochemically reduced graphene oxide-metal nanocomposite modified pencil graphite (ERGO-MC-PGE) electrode using adsorptive stripping differential pulse voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7350.

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>Magister Scientiae - MSc<br>This project focuses on the development of simple, highly sensitive, accurate, and low cost electrochemical sensors based on the modification of pencil graphite electrodes by the electrochemical reduction of graphene oxide-metal salts as nanocomposites (ERGO-MC-PGE; MC = Sb or Au nanocomposite). The electrochemical sensors ERGO-Sb-PGE and ERGO-Au-PGE were used in the determination of paracetamol (PC) in pharmaceutical formulations using adsorptive stripping differential pulse voltammetry. The GO was prepared from graphite via a modified Hummers’ method and characte

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9

Willemse, Chandre Monique. "Nanocomposite-graphene based platform for heavy metal detection." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8123_1323852117.

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This study reports the synthesis of graphene by oxidizing graphite to graphite oxide using H2SO4 and KMnO4 and reducing graphene oxide to graphene by using NaBH4. Graphene was then characterized using FT-IR, TEM, AFM, XRD, Raman spectroscopy and solid state NMR. Nafion-Graphene in combination with a mercury film electrode, bismuth film electrode and antimony film electrode was used as a sensing platform for trace metal analysis in 0.1 M acetate buffer (pH 4.6) at 120 s deposition time, using square-wave anodic stripping voltammetry (SWASV). Detection limits were calculated using 3Ïblank/slope

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10

Pavitt, David. "Few-layer transition metal chloride graphene intercalation compounds." Thesis, University of London, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603531.

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Few-layer transition metal chloride graphene intercalation compounds have becJI fabricated by the mechanical exfoliation of graphite intercalation compounds (GTCs) containing CoC12 , NiCh, CuCl2 , MnCh and FeC13 . The number of graphene layers and the distribution of the intercalate in the few-layer graphene intercalation compounds (FLGICs) have been characterised using the optical contrast of the FLGICs against the Si02 substrate and the G-peak of the Raman spectrum. FLGICs containing CL single intercalate layer surrounded by two graphene layers have been fabricated and characterised, which a

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11

Carey, McKenna Kathryn. "Synthesis and Analysis of Metal Oxide-Graphene Composites." Ohio Dominican University Honors Theses / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=oduhonors1620081905503444.

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12

Afshani, Parichehr. "Laser Vaporization Methods for the Synthesis of Metal and Semiconductor Nanoparticles; Graphene, Doped Graphene and Nanoparticles Supported on Graphene." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/569.

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The major objective of the research described in this dissertation is the development of new laser vaporization methods for the synthesis of metal and semiconductor nanoparticles, graphene, B- and N-doped graphene, and metal and semiconductor nanoparticles supported on graphene. These methods include the Laser Vaporization Controlled Condensation (LVCC) approach, which has been used in this work for the synthesis of: (1) gold nanoparticles supported on ceria and zirconia nanoparticles for the low temperature oxidation of carbon monoxide, and (2) graphene, boron- and nitrogen-doped graphene, hy

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13

Benítez, Moreno Luis Antonio. "Spin-orbit coupling in graphene/transition metal dichalcogenides devices." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671043.

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Aquest treball s’emmarca dins els camps de l’espintrònica i la spin-orbitrònica, l’objectiu final del qual és controlar el grau de llibertat de l’espín de l’electró mitjançant l’acoblament spin-òrbita (SOC) en sistemes d’estat sòlid. La recerca d’un major control de l’espín ha pres una direcció emocionant amb l’aïllament i posterior demostració de la injecció d’espín en grafè. Degut al baix SOC intrínsec del grafè, els espins poden viatjar distàncies llargues a través de la seva xarxa cristal·lina, la qual cosa fa del grafè un canal ideal per al transport d’espins. Tanmateix, el SOC feble del

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14

Posthuma, De Boer Joel. "Theoretical studies of epitaxial graphene formation on metal surfaces." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/45435.

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In this thesis we develop a set of phenomenological models that we apply to the problem of epitaxial growth of graphene on metal substrates. The high temperature and typically low flux conditions under which graphene growth occurs are such that state of the art techniques such as kinetic Monte Carlo (kMC) are extremely difficult to apply to study the growth processes. Rather we utilise simpler theories based on rate equations and also develop a technique based on the phase-field method of island front tracking. The latter method may be considered to be an addition to the class of techniques kn

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15

Krishna, Rahul. "Transition metal doped graphene for energy and electrical applications." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16543.

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Doutoramento em Nanociências e Nanotecnologia<br>In the view of rapid progress in the fabrication of nanoscale energy storage and electronic devices, graphene is a subject of great interest. As a truly two dimensional (2D) system, graphene possess extraordinary properties of high conductivity, high carrier mobility, large surface area (>2600 m2/g), flexibility, and chemical stability which are favourable for energy applications. Synthesis of high quality graphene still remains as a major challenge in graphene research. Various methods including mechanical exfoliation, thermal exfoliation

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16

ELAZAB, HANY. "Graphene-Supported Metal Nanoparticles For Applications in Heterogeneous Catalysis." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/560.

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Due to its unique properties and high surface area, Graphene has become a good candidate as an effective solid support for metal catalysts. The Nobel Prize in Physics for 2010 was awarded to Andre Geim and Konstantin Novoselov "for groundbreaking experiments regarding the two-dimensional material graphene". Microwave-assisted synthesis of various metallic nanostructured materials was investigated for CO oxidation applications. These metallic nanostructured materials were used to convert CO to CO2 as an effective approach for carbon monoxide elimination due to its harmful effect on health and e

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17

Iacopi, Francesca, N. Mishra, B. V. Cunning, et al. "Self-aligned graphene on silicon substrates as ultimate metal replacement for nanodevices." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-207052.

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We have pioneered a novel approach to the synthesis of high-quality and highly uniform few-layer graphene on silicon wafers, based on solid source growth from epitaxial 3C-SiC films [1,2]. The achievement of transfer-free bilayer graphene directly on silicon wafers, with high adhesion, at temperatures compatible with conventional semiconductor processing, and showing record- low sheet resistances, makes this approach an ideal route for metal replacement method for nanodevices with ultimate scalability fabricated at the wafer –level.

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18

Chapman, James Oliver. "Alkali metal doped graphene : superconductivity, structural, magnetic and optical properties." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/alkali-metal-doped-graphene-superconductivity-structural-magnetic-and-optical-properties(0ae09e60-4104-465a-a5ad-9cd2d6816661).html.

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Intercalation of graphite with alkali metals has previously been shown to, in some cases, produce superconducting compounds from the two non-superconducting components. The use of graphene as a basis to continue this research offers new possibilities as confinement of intercalant species is reduced from bulk graphite. Papers comprised of exfoliated graphene flakes were doped with Li, Cs, K and Ca atoms via vapour transport methods in order to investigate superconducting properties. While Li, Cs and K-doping showed no signs of a superconducting transition as low as 1.8 K, observed through magne

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19

Pokpas, Keagan William. "Graphene-modified pencil graphite bismuth-film electrodes for the determination of heavy metals in water samples using anodic stripping voltammetry." University of the Western Cape, 2013. http://hdl.handle.net/11394/4829.

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>Magister Scientiae - MSc<br>Electrochemical platforms were developed based on pencil graphite electrodes (PGEs) modified with electrochemically deposited graphene (EG) sheets and Nafion-graphene (NG) nanocomposites in conjunction with an in situ plated bismuth-film (EG-PG-BiE and NG-PG-BiE). The EG- and NG-PG-BiEs were used as sensing platforms for determining Zn2+, Cd2+ and Pb2+ by square wave anodic stripping voltammetry (SWASV). EG sheets were deposited onto pencil graphite electrodes by cyclic voltammetric reduction from a graphene oxide (GO) solution, while a dip coating method was used

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20

Karna, Sanjay K. "Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc849637/.

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A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to

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Karna, Sanjay K. "Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849637/.

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A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to

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22

Jean, Fabien. "Growth and structure of graphene on metal and growth of organized nanostructures on top." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY097/document.

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Le graphène, une monocouche de graphite, est composé d'atomes de carbone avec une structure en nid d'abeilles. Ses propriétés exceptionnelles ont attiré un intérêt mondial, dont le Prix Nobel de Physique en 2010. Le graphène épitaxié sur métal à rapidement été identifié comme un moyen de production de graphène de haute qualité de taille métrique, et est le sujet d'intenses activités de recherche en sciences de surface pour caractériser ses propriétés. En outre, ces études concernent aussi des systèmes plus complexes avec pour base le graphène, par exemple les réseaux ordonnés de nanoparticules

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23

Wu, Zhenkun. "Metal-reduced graphene oxide for supercapacitors and alternating current line-filters." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53941.

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We design a facile approach to investigate the role benzene derivatives play in the capacitance enhancement of graphene-based supercapacitors. The main reason is attributed to the pseudocapacitance of the aromatic molecules rather than the former one. Meanwhile, we find that the para and ortho substituted benzene derivatives contribute much more than the meta substituted ones. In addition, we fabricate an all-solid-state flexible MSC based on metal-reduced GO. The as-fabricated MSC shows high areal capacitance and excellent reliability, which makes it a promising energy storage candidate for

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24

Pan, Hanqing. "Heat-induced reshaping and coarsening of metal nanoparticle-graphene oxide hybrids." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1526943.

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<p> Glutathione-capped gold nanoparticles of size 1, 3, and 10 nm, CTAB-stabilized gold nanorods, as well as ro-carboxylate-functionalized palladium nanoparticles were synthesized and self-assembled onto graphene oxide to study their coarsening or reshaping behaviors upon heating at different temperatures ranging from 50 °C to 300 °C. These engineered nanoparticle- or nanorod-graphene oxide hybrid materials were studied by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy, and UV-Vis spectroscopy.</p><p> The spher

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Miao, Feng. "Electronic transport in novel nanoscale systems graphene and metal oxide switches /." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=56&did=1871856281&SrchMode=1&sid=2&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270148135&clientId=48051.

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Lin, Andrew. "Metal-Organic Frameworks and Graphene-Based Support Materials for Heterogeneous Catalysis." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5574.

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Nanoparticles are involved in a broad range of applications, including heterogeneous catalysis. Nanoparticles tend to quickly lose their well-defined shapes and facets due to aggregation under duress such as heat. A series of highly studied materials are explored as support materials for nanoparticle supports. These supports include metal-organic frameworks (MOF), graphene oxide (GO), and a MOF-PRGO (partially reduced graphene oxide) hybrid. The inclusion of a support with the palladium increased lifespan of the catalyst by separation of nanoparticles. The choice of support material not only a

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27

Zan, Recep. "Microscopy and spectroscopy of graphene : atomic scale structure and interaction with foreign atom species." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/microscopy-and-spectroscopy-of-graphene-atomic-scale-structure-and-interaction-with-foreign-atom-species(7ff75244-c81a-414f-88d2-e614297f0390).html.

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Since its discovery, the one atom thick material graphene has been at the centre of growing interest in two-dimensional materials. Due to its exceptional properties, graphene is a rich topic to explore by physicists, chemists, engineers and materials scientists. In addition to its use in the fundamental research, graphene is also a promising candidate for future electronics, photonics and energy storage devices.The project presented in this thesis was carried out to explore the structure of suspended graphene in particular in order to probe the metal-graphene interaction via Transmission Elect

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28

Leicht, Philipp [Verfasser]. "Local electronic properties of graphene flakes on noble metal surfaces / Philipp Leicht." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/109726954X/34.

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Dywili, Nomxolisi Ruth. "Development of Metal Nanoparticle-Doped Polyanilino-Graphene Oxide High Performance Supercapacitor Cells." University of the Western Cape, 2018. http://hdl.handle.net/11394/6251.

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Philosophiae Doctor - PhD (Chemistry)<br>Supercapacitors, also known as ultracapacitors or electrochemical capacitors, are considered one of the most important subjects concerning electricity or energy storage which has proven to be problematic for South Africa. In this work, graphene oxide (GO) was supported with platinum, silver and copper nanoparticles anchored with dodecylbenzenesulphonic acid (DBSA) doped polyaniline (PANI) to form nanocomposites. Their properties were investigated with different characterization techniques. The high resolution transmission electron microscopy (HRTE

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Naidoo, Fayyaadh. "Graphene modified Salen ligands for the electrochemical determination of heavy metal ions." University of Western Cape, 2020. http://hdl.handle.net/11394/7540.

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>Magister Scientiae - MSc<br>Environmental pollution is a major threat to all life, which needs to be addressed. Heavy metals are well-known environmental pollutants due to their toxicity and, persistence in the environment toxicity for living organisms and having a bioaccumulative nature. Environmentally, the most common hazardous heavy metals are: Cr, Ni, Cu, Zn, Cd, Pb, Hg, and As. Remediation using conventional physical and chemical methods is uneconomical and generates waste chemicals in large quantities. This study focuses on the extraction and determination of heavy metals (Nickel, Co

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Ji, Yijie. "Metal Organic Frameworks Derived Nickel Sulfide/Graphene Composite for Lithium-Sulfur Batteries." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron152233332526446.

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Ghaffari, Nastaran. "Electrochemical deposition of Graphene Oxide- metal nano-composite on Pencil-Graphite Electrode for the high sensitivity detection of Bisphenol A by Adsorptive Stripping Differential Pulse Voltammetry." University of the Western Cape, 2018. http://hdl.handle.net/11394/6336.

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Magister Scientiae - MSc (Chemistry)<br>Electrochemical platforms were developed based on pencil graphite electrodes (PGEs) modified electrochemically with reduced graphene oxide metal nanoparticles (ERGO–metalNPs) composite and used for the high-sensitivity determination of Bisphenol A (BPA) in water samples. Synergistic effects of both reduced Graphene Oxide sheets and metal nanoparticles on the performance of the pencil graphite electrode (PGE) were demonstrated in the oxidation of BPA by differential pulse voltammetry (DPV). A solution of graphene oxide (GO) 1 mg mL-1 and 15 ppm of m

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Summerfield, Alex. "Studies of self-assembled metal-organic nanostructures and the MBE growth of graphene." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33067/.

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This thesis discusses the formation of metal-organic and organic structures grown on surfaces using bottom-up self-assembly techniques. Three systems are investigated primarily using scanning probe microscopy techniques. The growth of metal-organic frameworks (MOFs) on functionalised surfaces is investigated using high resolution atomic force microscopy (AFM). The earliest stages of MOF crystal nucleation are imaged using a layer-by-layer (LBL) growth technique and the ability to track the growth of individual nanocrystallites throughout the LBL process is demonstrated. This LBL method has bee

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David, Lamuel Abraham. "Van der Waals sheets for rechargeable metal-ion batteries." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/32796.

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Doctor of Philosophy<br>Department of Mechanical and Nuclear Engineering<br>Gurpreet Singh<br>The inevitable depletion of fossil fuels and related environmental issues has led to exploration of alternative energy sources and storage technologies. Among various energy storage technologies, rechargeable metal-ion batteries (MIB) are at the forefront. One dominant factor affecting the performance of MIB is the choice of electrode material. This thesis reports synthesis of paper like electrodes composed for three representative layered materials (van der Waals sheets) namely reduced graphene oxide

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Sanga, Nelia Abraham. "Determination of heavy metals at the electrochemically reduced graphene oxide mercury film electrode (ERGO-HgF-PGE) using adsorptive stripping voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7718.

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>Magister Scientiae - MSc<br>This work reports the use of a pencil graphite electrode (PGE) as inexpensive and sensitive electrochemical sensing platform fabricated by using electrochemically reduced graphene oxide (ERGO) in conjunction with an in-situ plated thin mercury film. For the first time the ERGOHgF-PGE sensor is proposed for simultaneous detection of cadmium (Cd2+), copper (Cu2+), lead (Pb2+) and zinc (Zn2+) using N-Nitroso-N-phenylhydroxylamine (cupferron) as complexing agent by square-wave adsorptive cathodic stripping voltammetry (SW-AdCSV). The technique is based on the adso

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Khawaja, Mohamad. "Synthesis and Fabrication of Graphene/Conducting Polymer/Metal Oxide Nanocomposite Materials for Supercapacitor Applications." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5715.

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The rising energy consumption worldwide is leading to significant increases in energy production with fossil fuels being the major energy source. The negative environmental impact of fossil fuel use and its finite nature requires the use of alternative sources of energy. Solar energy is a clean alternative energy source; however, its intermittent nature is a major impediment that needs to be reduced or eliminated by the development of cost effective energy storage. Thermal storage in tanks filled typically with molten salt at elevated temperatures is widely used in concentrating solar power pl

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Adán, Mas Alberto. "Advanced metal graphene composite electrodes for a new generation of electrochemical energy storage devices." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0181/document.

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Actuellement, les supercondensateurs sont au centre de beaucoup de recherches. Ils offrent une solution potentielle pour le stockage réversible de l´énergie que ce soit pour le domaine spatial, aéronautique ou encore le transport (véhicules hybrides). Un axe de recherche important, visant à augmenter les densités d'énergie et de puissance, est consacré aux systèmes oxydes de métaux de transition /charbon actif (C) asymétriques. Les systèmes à base de RuO2 présentent les capacités les plus élevées, supérieures à 700 F/g, mais leur coût et leur toxicité limitent leur application aux petits appar

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Wang, Bo. "An atomistic approach to graphene and carbon clusters grown on a transition metal surface." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2069.

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In this thesis, graphene (i.e. monolayer carbon film) and carbon clusters supported on a transition metal surface are systematically studied by local probe techniques, with respect to their structures, electronic properties and formation mechanisms. The main tools used are low-temperature scanning tunnelling microscopy and spectroscopy (STM and STS), which are introduced in Chapter 2. The mechanism of the resonance tunnelling at electron energies higher than the work function of the surface is discussed in detail, and a qualitative explanation of the Gundlach oscillations in the corresponding

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Ezeigwe, Ejikeme Raphael. "Green synthesis of graphene-metal oxides composites as a promising electrode for energy storage." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52517/.

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The key motivation of this study is to investigate the potential of graphene/metal oxides nanocomposites as electrodes for electrochemical capacitor applications. It is envisioned that the positive synergistic effect between graphene and metal oxides (where novel graphene material acts as a highly conductive platform for ease of ion transfer kinetics and metal oxide acts as spacers to avoid the restacking of graphene sheets to make available more active surface areas) results in excellent electrode material for high performance electrochemical capacitor. In this thesis, a series of hybrid comp

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Docherty, Callum James. "Terahertz spectroscopy of graphene and other two-dimensional materials." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:98c03952-dc3f-442b-bbc0-d8397645cc1b.

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In this thesis, two-dimensional materials such as graphene are tested for their suitability for opto-electronic applications using terahertz time domain spectroscopy (THz-TDS). This ultrafast all-optical technique can probe the response of novel materials to photoexcitation, and yield information about the dynamics of the material systems. Graphene grown by chemical vapour deposition (CVD) is studied using optical-pump THz-probe time domain spectroscopy in a variety of gaseous environments in Chapter 4. The photoconductivity response of graphene grown by CVD is found to vary dramatically depen

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Dywili, Nomxolisi. "Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials." University of the Western Cape, 2014. http://hdl.handle.net/11394/4453.

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>Magister Scientiae - MSc<br>Supercapacitors are one of the important subjects concerning energy storage which has proven to be a challenge in this country. Currently, the electrodes of most commercial supercapacitor are made of carbon which is known to be inexpensive and has high resistance to corrosion. These carbon based supercapacitors operate under EDLC. They offer fast charging/discharging rates and have the ability to sustain millions of cycles without degrading. With their high power densities, they bridge the gap between batteries which offer high energy densities but are slow in char

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Hass, Joanna R. "Structural characterization of epitaxial graphene on silicon carbide." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26654.

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Thesis (Ph.D)--Physics, Georgia Institute of Technology, 2009.<br>Committee Co-Chair: Conrad, Edward; Committee Co-Chair: First, Phillip; Committee Member: Carter, Brent; Committee Member: de Heer, Walter; Committee Member: Zangwill, Andrew. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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He, Jinbao. "Heterojunctions of defective graphenes with 2D materials and metal nanoplatelets: preparation and catalytic applications." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/111923.

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En esta Tesis Doctoral, las heterouniones de grafeno con otros materiales 2D y nanopartículas metálicas, incluyendo (N)grafeno/h-BN, grafeno/MoS2 y grafeno depositado Fe/Co, se sintetizaron en base al uso de polisacáridos naturales como precursors de grafeno. Estos materials se caracterizaron usando diversos métodos analíticos y se ensayaron para determinar el acoplamiento C-N oxidativo de las amidas, la hidrogenación de CO2 o la aplicación catalítica fotoeléctrica y física. En la primera etapa de la tesis, se estudió la influencia de la temperatura y la presencia de H2 durante la pirólisis e

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Verastegui, Wudmir Yudy Rojas. "Electronic and transport properties of graphene nanoribbons with adsorbed transition metal impurities : spin-orbit interaction." reponame:Repositório Institucional da UFABC, 2013.

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Song, Hoon Sub. "Desulfurization by Metal Oxide/Graphene Composites." Thesis, 2014. http://hdl.handle.net/10012/8341.

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Desulfurization of liquid and gas phase sulfur compounds has been receiving dramatic attention since sulfur compounds cause environmental damages (especially acid rain) and pose industrial challenges (i.e. corrosion of equipment and deactivation of catalysts). This thesis has focused on the removal of liquid phase aromatic sulfur compounds (i.e. thiophene or dibenzothiophene (DBT)), as well as on the removal of gas phase hydrogen sulfide (H2S) through adsorption method by metal oxide/graphene composites. More specifically, the effects of graphene (or reduced graphite oxide) as a substrate were

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Fang, Peng-Wei, and 方芃幃. "Characteristic of Magnetized Metal-Insulator-Metal Structure with Graphene Electrodes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/58011905830490914826.

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碩士<br>國立交通大學<br>影像與生醫光電研究所<br>104<br>There are lots of researches about capacitors. It is the main goal for everyone to achieve high effect on capacitors. So we apply magnetic materials into the process of the capacitor to cause carriers transport through built-in magnetic field, and we choose a high conductivity as electrodes. FePt is selected as magnetic material, and graphene is for electrodes. There are three parts in this thesis. the first part is the design and fabrication of MIM structure. The second part are introductions of the magnetic annealing system and the method for built-in mag

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Lu, Jui-Cheng, and 呂睿晟. "Preliminary Study of Synthesis for Non-Ferromagnetic Graphite(Graphene) Encapsulated Metal Nanoparticles." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/47122634412147046088.

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Hsu, Min-Chun, and 徐敏峻. "Study on metal nanoparticles/graphene for fuel cell." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/74594592149522792176.

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碩士<br>國立雲林科技大學<br>材料科技研究所<br>100<br>Pt nanoparticles on graphene was formed from graphite oxide by two step reduction. Raman spectra analysis showed that the graphene can be formed from graphite oxide by two step reduction. The Pt nanoparticles could be uniformly dispersed on graphene and the Pt nanoparticles have a face center cubic structure showed by the observation of transmission electron microscope. The analysis of X-ray diffraction showed that the grapheme is quite random, the peaks of carbon being quite broadened. The analysis of thermal gravity (TGA) showed that the reduction efficien

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Liu, Xiang-sheng, and 劉翔昇. "Enhanced Efficiency of Graphene Photodetector via Metal Nanoparticles." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/ys66wj.

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碩士<br>中原大學<br>電子工程研究所<br>104<br>Recently, two-dimensional graphene with unique optical and electrical properties makes it a promising candidate for various devices, such as sensors and photovoltaics. Unfortunately, the performance of the single-layer graphene device may be limited due by its one-atomic-layer thickness. To order to overcome the obstacle, corporation of graphene with plasmonic structure or integrating graphene with cavities have been proposed to improve the device performance. However,those such enhancements achieved by the surface plasmon resonance effect or photonic cavities c

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Silva, Maria Margarida Linhares de Andrade Rocha e. "Nitrogen-doped graphene as metal free carbon-nanocatalysts." Tese, 2018. https://hdl.handle.net/10216/116200.

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