Дисертації з теми "Graphene-metal nanostructures"
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Khan, Hafeez Ullah. "Decoration of graphene sheets with metal and metal oxide nanostructures by low-pressure plasma deposition." Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/2038/1/Hafeez_Ullah_Thesis.pdf.
Повний текст джерелаSummerfield, 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/.
Повний текст джерелаJean, 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.
Повний текст джерелаGraphene, a monolayer of graphite, is composed of carbon atoms arranged in a honeycomb lattice. Its exceptional properties have attracted a worldwide interest, including the Novel Prize in Physics in 2010. Epitaxial graphene on a metal was rapidly identified as an efficient method for large-area production of high quality graphene, and also was the matter of intense activities exploiting surface science approaches to address the various properties of graphene and of advanced systems based on graphene, for instance ordered lattice of metal nanoparticles on graphene. This resulted in the study of growth, structure and defects of epitaxial graphene on a wide variety of substrates with various techniques such as scanning tunneling microscopy, angle-resolved photoemission spectroscopy or low-energy electron microscopy. This work focuses on graphene grown on the (111) surface of iridium in ultra-high vacuum conditions and studied with several diffraction techniques (surface X-ray diffraction, grazing incidence X-ray diffraction, X-ray reflectivity, and reflection-high energy electron diffraction). These experiments were performed at the European Synchrotron Radiation Facility in Grenoble, France. The first step in our study was to determine the structure of graphene at the atomic scale. The system was found to have a tendency to commensurability, but that the precise structure depends on temperature and on preparation conditions. Moreover, with the combination of high resolution diffraction techniques, a precise characterization about the debated structure of graphene perpendicular to the surface was unveiled. The system, exhibits a superstructure, typical of epitaxial graphene, called a moiré, as an equivalent of the moiré effect in optics. This is used as a template to grown nanoparticles on top of the system to achieve the self-organisation of monodisperse nanoparticles. In this study, three type of nanoparticles were investigated, two different size of pure platinum ones and bimetallic ones, platinum and cobalt. These hybrid systems show very high degree of order, partly inherited by the superstructure lattice. The nanoparticles were found to strongly bond to their support, experience substantial surface strain related to their small size, and that bimetallic ones grown in a sequential manner retain a chemically layered structure
Mei, Jun. "Optimization of two-dimensional nanostructures for rechargeable batteries." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/135045/1/Jun%20Mei%20Thesis.pdf.
Повний текст джерелаDocherty, 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.
Повний текст джерелаPiloto, Carlo. "Carbon nanomaterials for room temperature gas sensing." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/97743/1/Carlo_Piloto_Thesis_Redacted.pdf.
Повний текст джерелаBAKRY, AYYOB MOHAMMED A. "Applications of Chemically Modified Nitrogen Doped Carbon, Zirconium Phosphate, Metal Organic Frameworks, and Functionalized Graphene Oxide Nanostructured Adsorbents in Water Treatment." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6105.
Повний текст джерелаLi, Yanguang. "Nanostructured Materials for Energy Applications." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275610758.
Повний текст джерелаBhardwaj, Shivani. "Plasmonic properties of graphene-metal nanostructures for broad spectral tailoring." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7946.
Повний текст джерелаDas, Barun. "Investigations Of Graphene, Noble Metal Nanoparticles And Related Nanomaterials." Thesis, 2011. http://hdl.handle.net/2005/2432.
Повний текст джерелаDas, Barun. "Investigations Of Graphene, Noble Metal Nanoparticles And Related Nanomaterials." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2432.
Повний текст джерелаWei, Yiying. "Graphene and metal oxide nanomaterials for high-performance supercapacitors." Thesis, 2015. http://hdl.handle.net/10453/116211.
Повний текст джерелаEnergy storage systems (ESSs) play a critical role in plenty of applications including renewable energy systems, power systems for electric vehicles (EVs) and hybrid electric vehicles (HEVs), and electrical power grids for improving reliability and overall use of the entire system. Currently, there are several types ESSs dominated the energy storage. Each kind of ESSs has their own operation mechanism, energy efficiency, energy density, power density, cycle life, charge and discharge capability, cost efficiency, operating temperature. The common ESS is based on lead acid battery which stores electrical energy in the form of chemical energy. However, if the batteries are overdischarged or kept at a discharged state, its capability will be irreversibly undermined because the sulfate crystals become larger and more difficult to break up during recharge. Since the first NiCd battery was created by Waldemar Jungner in 1899, even though NiCd battery technologies have experienced a series of evolutionary developments, its demerits are obvious including 1) shorter life cycle; 2) memory effect; 3) toxicity of Cd; 4) lower energy density; and 5) limited negative temperature coefficient. Based on the development of NiCd battery technology, nickel metal hydride (NiMH) batteries was proposed by researchers which possess better performance than NiCd batteries in cycle life, energy density and charge&discharge rates. Lithium ion is the preferred chemistry, having a superior specific energy and power density to nickel metal hydride. More lithium per gram stored in the electrodes contributes to higher energy density and power density. In addition to chemical battery system, researchers recently proposed some new sorts of ESSs including flywheel, compressed air energy storage (CAES), superconductive magnetic energy storage (SMES), etc. All of them can provide super energy density and power density. But they are more or less blocked ether in complex mechanical construction or cooling device. Supercapacitor has emerged to be an exciting energy storage device, which is able to provide high specific power, charge and discharge up to million times, have long lifetime and broad range of working temperature. Even though supercapacitor has been widely seen as a promising energy storage candidate to replace the traditional chemical batteries, it also suffer its drawback that the low energy density (the energy stored in per unit of volume and weight), high equivalent series resistance (ESR) and its high cost associated with its performance. Therefore, this PHD thesis project aims to address these drawbacks of supercapacitor by designing different nanotechnologies and fabrication methods to synthesize advance materials with better performance than that of conventional supercapacitor. A Series of designed structures and materials were fabricated by designed methods. All the materials were also investigated by using X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) observation techniques, Brunauer–Emmett–Teller (BET) surface area measurement and electrochemical testing. A facile and effective hydrothermal treatment that is able to control the condensation speeds of precursors in the solution along the <010>, <100> and <001> directions was designed to fabricate vanadium oxide nanoribbon used for the electrode of supercapacitor. It was achieved by controlling the hydrothermal reaction time and the weight ratio to synthesize the ultralong vanadium oxide nanoribbon with controlled width. It has high specific capacitance of 453 F g⁻¹ at the scam rate of 2 mV s⁻¹ in 2 M NaCl electrolyte, and it still maintained a high capacitance of 201 F g⁻¹ at a higher scan rate of 50 mV s⁻¹, attributing to the easy ion insertion and electronic transport along the a-b plane rather through the layers of the c-axis. Vanadium oxide nanotubes were synthesized by a revised hydrothermal treatment with high-speed stirring. The preparation involved dissolution of V₂O₅ into H₂O₂ and high-speed stirring (10000 r/min) with hexadecylamine. The product was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and thermogravimetric analysis. The electrochemical properties of the materials as electrodes for electrochemical capacitors were evaluated by cyclic voltammetry in a three electrode system consisting of a saturated calomel electrode as reference electrode, platinum as a counter electrode and the active materials as the working electrode. A high capacitance of 148.5 F g⁻¹ was obtained at a scan rate of 2 mV s⁻¹ in 2M KCl. The electrode maintained a high capacitance of 105 F g⁻¹ at a higher scan rate of 50 mV s⁻¹ in 2M KCl electrolyte. 3D mesoporous hybrid NiCo₂O₄@graphene nanoarchitectures were successfully synthesized by a combination of freeze drying and hydrothermal reaction. Field-emission scanning electron microscopy (FESEM) and TEM analyses revealed that NiCo₂O₄@graphene nanostructures consist of a hierarchical mesoporous sheet-on-sheet nanoarchitecture with a high specific surface area of 194 m² g⁻¹. Ultrathin NiCo₂O₄ nanosheets, with a thickness of a few nanometers and mesopores ranging from 2 to 5 nm, were wrapped in graphene nanosheets and formed hybrid nanoarchitectures. When applied as electrode materials in supercapacitors, hybrid NiCo₂O₄@graphene nanosheets exhibited a high capacitance of 778 F g⁻¹ at the current density of 1 A g⁻¹, and an excellent cycling performance extending to 10000 cycles at the high current density of 10 A g⁻¹. We also presented a rational, large-scale and general method, called controllable freeze casting (CFC), to fabricate a high-densely assembled and aligned free-standing NiCo₂O₄@graphene 3D foam by vacuum filtration and air compress pressure assembly method. In the designed method, the amount of water is controllable, therefore controlling the size and the shape of the ice when the material was introduced into freeze drying system, finally achieving controllable pore size and aligned structure. This free-standing foam retains the intrinsic properties of graphene sheet, such as high surface area and high electrical conductivity. In the foam, the graphene sheets build the high conductive skeletons. And the skeletons with high surface areas support the uniform distribution of NiCo₂O₄ nanoparticles on the graphene sheets. By controlling the amount of water in the precursor, it is possible to fabricate 3D NiCo₂O₄@graphene foams with a wide range of thickness and pore size. This dense NiCo₂O₄@graphene material exhibited a high capacitance of 790 F g⁻¹ at a current density of 2 A g⁻¹, and an excellent cycling performance at a high current density of 10 A g⁻¹. The compression test revealed that the 3D NiCo₂O₄@graphene foam exhibited strong mechanical property which is able to support 20,000 times its own weight without structure collapsing. The novel synthesis method of such 3D foam with excellent properties paves the way to explore the application of lamellar materials like graphene in a self-supporting, metal oxide deposition and 3D foam.
Kalapu, Chakrapani. "Synthesis, Physiochemical And Electrochemical Studies On Iridium, Osmium And Graphene Oxide-Based Nanostructures." Thesis, 2013. http://etd.iisc.ernet.in/handle/2005/2631.
Повний текст джерелаKalapu, Chakrapani. "Synthesis, Physiochemical And Electrochemical Studies On Iridium, Osmium And Graphene Oxide-Based Nanostructures." Thesis, 2013. https://etd.iisc.ac.in/handle/2005/2631.
Повний текст джерелаAnumol, E. A. "Mechanisms of Formation and Thermal Stabililty of Functional Nanostructures." Thesis, 2012. http://etd.iisc.ac.in/handle/2005/3163.
Повний текст джерелаAnumol, E. A. "Mechanisms of Formation and Thermal Stabililty of Functional Nanostructures." Thesis, 2012. http://hdl.handle.net/2005/3163.
Повний текст джерелаGhosh, Sandeep. "Investigation Of Inorganic Nanomaterials & Polymer Films." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2349.
Повний текст джерелаGhosh, Sandeep. "Investigation Of Inorganic Nanomaterials & Polymer Films." Thesis, 2011. http://hdl.handle.net/2005/2349.
Повний текст джерелаFerreira, Francisco Branco. "Microstructural and Mechanical Characterization of Graphene Oxide-Reinforced Aluminium-Matrix Nanostructured Composites fabricated by Accumulative Roll Bonding™." Master's thesis, 2017. http://hdl.handle.net/10362/37538.
Повний текст джерелаFORTUNATO, MARCO. "Production and characterization of ZnO/Graphene devices for energy harvesting." Doctoral thesis, 2019. http://hdl.handle.net/11573/1237548.
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