Download or read book The Synthesis and Application of Chemical Vapor Deposited Graphene written by Jaime Antonio Torres and published by . This book was released on 2014 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene is one of the most amazing materials every discovered. It is the first stable two-dimensional crystal ever studied and has broadly impacted a myriad of fields ranging from physical science to engineering. Science has made such great advancements due to graphene that its discovery earned Nobel recognition in 2010. Initially isolated from bulk graphite using cellophane tape, its use in macroscale applications requires methods to produce it in high quality and on a very large scale. This synthetic problem is the basis for this thesis whereby the scalable synthesis and application of graphene is demonstrated utilizing chemical vapor deposition (CVD). Mono-carbon containing methane gas is the most utilized carbon precursor for the CVD growth of graphene. To study the effects of other hydrocarbon precursor gases, graphene was grown by chemical vapor deposition from methane, ethane, and propane on copper foils. The larger molecules were found to more readily produce bilayer and multilayer graphene, due to a higher carbon concentration and different decomposition processes. Single- and bilayer graphene was grown with good selectivity in a simple, single-precursor process by varying the pressure of ethane from 250 to 1000 mTorr as characterized by Raman spectroscopy. The bilayer graphene is AB-stacked as shown by selected area electron diffraction analysis. Vertically oriented structures of conductors and semiconductors, especially single crystals, are of great technological importance due to their directional and rapid charge carrier transport yet there does not exist a facile way to produce them. Here, we report a facile, solution-based "bottom-up" route for producing highly oriented, single crystalline, vertical arrays of conjugated molecules that exhibit uniform morphological and crystallographic orientations by employing a layer of graphene as a guiding substrate. Using an oligoaniline as model, we demonstrate that this method is highly versatile, allows for precision growth and deposition of crystals by first patterning the growth graphene substrates, and allows for the anisotropic transport of charged carriers to efficiently reach a conductivity of 12.3 S/cm along the vertical axis, the highest reported to date for an aniline oligomer. Large-area devices where current from individual crystals can be collectively harnessed are demonstrated, illustrating its promise for both micro- and macro-scopic device applications. The transfer of large sheets of graphene is desired for a variety of applications including electronics and membrane technology. Currently, CVD grown graphene is isolated from a growth catalyst by use of polymer-assisted transfer. The underlying growth catalyst is etched away while the polymer acts as a support for transfer to arbitrary substrates before it is removed chemically and by high temperature annealing. While transferring graphene onto rigid substrates that can survive post-processing high temperature anneals is possible, the same is not true for plastic and flexible substrates. The use of the polymer may lead to unwanted contamination and damaged graphene films. We demonstrate a way to transfer very large sheets of graphene tailored for thickness onto flexible and porous membranes supports for use in size selective filtration. We utilize optimized concentrations of ammonium persulfate to etch graphene grown on Cu-Ni alloys to produce polymer-free graphene film that can be transferred onto arbitrary substrates.
Download or read book Graphene Materials written by George Z. Kyzas and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vertically Oriented Graphene written by Junhong Chen and published by Springer. This book was released on 2015-03-23 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the basic concepts, synthesis techniques, and applications of vertically-oriented graphene. The authors detail emerging applications of vertically-oriented graphene such as field emitters, atmospheric nanoscale corona discharges, gas sensors and biosensors, supercapacitors, lithium-ion batteries, fuel cells (catalyst supports) and electrochemical transducers. They offer a perspective on current challenges to enabling commercial applications of vertically-oriented graphene.
Download or read book Synthesis of Graphene by Chemical Vapor Deposition and Its Applications in Electronics and Sensing written by Wei Wu and published by . This book was released on 2011 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Vapor Deposition for Nanotechnology written by Pietro Mandracci and published by BoD – Books on Demand. This book was released on 2019-01-10 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical vapor deposition (CVD) techniques have played a major role in the development of modern technology, and the rise of nanotechnology has further increased their importance, thanks to techniques such as atomic layer deposition (ALD) and vapor liquid solid growth, which are able to control the growth process at the nanoscale. This book aims to contribute to the knowledge of recent developments in CVD technology and its applications. To this aim, important process innovations, such as spatial ALD, direct liquid injection CVD, and electron cyclotron resonance CVD, are presented. Moreover, some of the most recent applications of CVD techniques for the growth of nanomaterials, including graphene, nanofibers, and diamond-like carbon, are described in the book.
Download or read book Large Scale Graphene by Chemical Vapor Deposition Synthesis Characterization and Applications written by Lewis Gomez De Arco and published by . This book was released on 2011 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large Scale Graphene by Chemical Vapor Deposition: Synthesis, Characterization and Applications.
Download or read book Chemical Synthesis and Applications of Graphene and Carbon Materials written by Markus Antonietti and published by John Wiley & Sons. This book was released on 2017-03-20 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ready reference and handbook is unique in its focus on synthesis and the application of graphene and other carbon materials with an emphasis on chemistry aspects. To this extent, it deals with top-down and bottom-up approaches across the different length scales for graphene from polycyclic aromatic hydrocarbons to graphene nanoribbons and graphene sheets, as well as carbon materials from quantum dots, nanostructured particles, and fibers, right up to tubes, bulk structures, and much more besides. In so doing, it presents the best synthetic methods: pyrolysis, chemical vapor deposition, templating and surface-mediated synthesis, self-assembly, surface-grafting and modification. Edited by two excellent, experienced and highly renowned editors, both of whom are directors of Max Planck Institutes.
Download or read book 2D Materials written by Phaedon Avouris and published by Cambridge University Press. This book was released on 2017-06-29 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the most recent advances in 2D materials with this comprehensive and accessible text. Providing all the necessary materials science and physics background, leading experts discuss the fundamental properties of a wide range of 2D materials, and their potential applications in electronic, optoelectronic and photonic devices. Several important classes of materials are covered, from more established ones such as graphene, hexagonal boron nitride, and transition metal dichalcogenides, to new and emerging materials such as black phosphorus, silicene, and germanene. Readers will gain an in-depth understanding of the electronic structure and optical, thermal, mechanical, vibrational, spin and plasmonic properties of each material, as well as the different techniques that can be used for their synthesis. Presenting a unified perspective on 2D materials, this is an excellent resource for graduate students, researchers and practitioners working in nanotechnology, nanoelectronics, nanophotonics, condensed matter physics, and chemistry.
Download or read book Graphene written by Jian Ru Gong and published by BoD – Books on Demand. This book was released on 2011-09-15 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of graphene has led to a deluge of international research interest, and this new material in the field of materials science and condensed-matter physics has revealed a cornucopia of new physics and potential applications. This collection gives a roughly review on the recent progress on the synthesis, characterization, properties and applications of graphene, providing useful information for researchers interested in this area.
Download or read book Graphene written by Wonbong Choi and published by CRC Press. This book was released on 2016-04-19 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the late 20th century, graphene-a one-atom-thick planar sheet of sp2-bonded carbon atoms densely packed in a honeycomb crystal lattice-has garnered appreciable attention as a potential next-generation electronic material due to its exceptional properties. These properties include high current density, ballistic transport, chemical inertness,
Download or read book Carbon Nanowalls written by Mineo Hiramatsu and published by Springer Science & Business Media. This book was released on 2010-07-23 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Representing the first text to cover this exciting new area of research, this book will describe synthesis techniques of CNWs, their characterization and various expected applications using CNWs. Carbon-nanowalls (CNWs) can be described as two-dimensional graphite nanostructures with edges comprised of stacks of plane graphene sheets standing almost vertically on the substrate. These sheets form a wall structure with a high aspect ratio. The thickness of CNWs ranges from a few nm to a few tens of nm. The large surface area and sharp edges of CNWs may prove useful for a number of applications such as electrochemical devices, field electron emitters, storage materials for hydrogen gas, catalyst support. In particular, vertically standing CNWs with a high surface-to-volume ratio, serve as an ideal material for catalyst support for fuel cells and in gas storage materials.
Download or read book LIQUID BASED CHEMICAL VAPOR DEPOSITION SYNTHESIS OF GRAPHENE WITH VARIATIONS ON THE DOPANTS AND THE NUMBER OF LAYERS written by Haoyue Zhu and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Graphene is an atomically thin carbon material with high carrier mobility and transparency to visible light. But because graphene lacks a bandgap and is chemically inert, significant amount of research has been dedicated to making it more suitable for applications such as transistors and molecular sensors. The research within this dissertation investigates the synthesis of graphene using Chemical Vapor Deposition (CVD) with liquid precursors, and the synthetic conditions are varied in ways so that the number of layers and dopant incorporations are changed for graphene. Chapter 1 briefly introduces the properties, synthesis, and characterization of graphene. In Chapter 2, the synthesis of monolayer graphene is demonstrated using toluene in an atmospheric pressure CVD (APCVD) system. The properties of monolayer graphene were characterized by Raman Spectroscopy, UV-Vis Spectroscopy, and High-resolution Transmission Electron Microscopy. The synthesized monolayer graphene was used as the transparent conducting film for a graphene/silicon Schottky junction solar cell, and it is suggested that the photo-conversion efficiency (PCE) of the cell can be maximized with a suitable coating of PMMA and HNO3 treatment. In Chapter 3, bi-layer graphene is synthesized in an APCVD system using toluene, and a graphene/WS2 vertical heterolayer was constructed by transferring CVD-synthesized monolayer WS2 flakes onto monolayer and bi-layer graphene. It is demonstrated that while monolayer WS2 only shows a single exciton peak when it was transferred on top of monolayer graphene, the underlying bi-layer graphene in the hetero-layer induced an extra trion peak in monolayer WS2. The construction of graphene/WS2 vertical heterolayer using a transfer process and the trion peak generation using CVD-synthesized bi-layer graphene has not been reported before. Finally, the synthesis of N-doped graphene (N-G) using pyridine and its application in Graphene-Enhanced Raman Spectroscopy (GERS) is investigated in Chapter 5. It is suggested that the Raman signals of the Crystal Violet, a fluorescent dye, were enhanced after they were deposited on top of N-G when compared to those deposited on Pr-G. The synthetic parameters of N-G were also found to be correlated to the GERS efficiency of it.
Download or read book Physics and Chemistry of Graphene written by Toshiaki Enoki and published by CRC Press. This book was released on 2013-01-24 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: From a chemistry aspect, graphene is the extrapolated extreme of condensed polycyclic hydrocarbon molecules to infinite size. Here, the concept on aromaticity which organic chemists utilize is applicable. Interesting issues appearing between physics and chemistry are pronounced in nano-sized graphene (nanographene), as we recognize the importance of the shape of nanographene in understanding its electronic structure. In this book, the fundamental issues on the electronic, magnetic, and chemical properties of condensed polycyclic hyodrocarbon molecules, nanographene and graphene are comprehensively discussed.
Download or read book Plasma Enhanced Chemical Vapor Deposition of Graphene written by and published by . This book was released on 2013 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Graphene written by Challa Vijaya Kumar and published by Elsevier. This book was released on 2017-08-10 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Graphene: Chemical and Biochemical Applications addresses a broad range of graphene research, including the prehistory and background of graphene, synthetic approaches, characterization techniques, composites/derivatives, inorganic graphene analogues, and applications of graphene. The book’s special emphasis on solution chemistry and graphene sets it apart from less practical titles in that its concepts are immediately implementable in the laboratories of chemists and biochemists. The book presents a variety of experimental approaches from the authors’ research laboratories and others around the world for graphene preparation in the solution phase, especially under aqueous conditions or in animal serum—the most practical kind of graphene for chemists and biochemists. The book is ideally suited for a broad range of readers, including advanced undergraduates, graduate research students and professionals in state-of-the-art research labs who want to use graphene to develop novel applications. Features reviews of the most recent advances in graphene research across chemistry and biochemistry Emphasizes chemical and biological applications for specialists, aiding more multi-disciplinary research Presents a variety of experimental approaches for graphene preparation in the solution phase, especially under aqueous conditions or even in animal serum
Download or read book Graphene from Natural Sources written by Amir Al-Ahmed and published by CRC Press. This book was released on 2022-07-18 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the synthesis of graphene obtained from different natural raw materials and waste products as a low-cost, environmentally friendly alternative that delivers a quality final product. Expert researchers review potential sources of natural raw materials and waste products, methods or characterization, graphene synthesis considerations, and important applications. FEATURES Explores the different approaches to the synthesis of graphene oxide (GO) and reduced graphene oxide (rGO) from natural and industrial carbonaceous wastes Outlines the modification and characterization methods of GO and rGO Addresses the characterization methods of GO and rGO Details applications of GO and rGO created from natural sources Graphene is a multidisciplinary material with applications in almost every sector of science and engineering. Graphene from Natural Sources: Synthesis, Characterization, and Applications is a noteworthy reference for material scientists and engineers in academia and industry interested in reducing costs and employing green synthesis methods in their work.
Download or read book Chemical Vapor Deposition CVD written by Monica Powell and published by Nova Science Publishers. This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides new research on types and uses of chemical vapor deposition (CVD). Chapter One focuses on the synthesis and characteristics of carbon nanofibers based on phenolic resin and transition metal catalysts by CVD. Chapter Two provides an overview of different reactor types that have been proved to be viable options for graphene growth. Chapter Three outlines the significance of atmospheric pressure chemical vapor deposition technology in large area graphene electrodes and demonstrates their use in lithium ion batteries towards the advancement of their performance. Chapter Four analyses low-energy plasma CVD for epitaxy and in-situ doping of group-IV semiconductors in nanoelectronics.
