Flame Synthesis And Applications Of Metal Oxide Nanowires
DOWNLOAD
Download Flame Synthesis And Applications Of Metal Oxide Nanowires PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Flame Synthesis And Applications Of Metal Oxide Nanowires book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Flame Synthesis And Applications Of Metal Oxide Nanowires
DOWNLOAD
Author : Pratap Mahesh Rao
language : en
Publisher:
Release Date : 2013
Flame Synthesis And Applications Of Metal Oxide Nanowires written by Pratap Mahesh Rao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Herein, two novel methods for the flame synthesis of metal oxide nanowire arrays and related nanomaterials are developed and investigated. Both methods are rapid (micrometer/minute axial growth rate), atmospheric, controllable and scalable, and result in highly pure and crystalline materials. Simultaneously, these methods allow the growth of metal oxide nanowires on diverse, technologically relevant, and often delicate substrates. The first method is flame-heated solid phase diffusion growth, in which a metal substrate is rapidly heated to high temperatures by a flame, and metal oxide nanowires grow by metal diffusion out of the substrate in the hot, oxidative post-flame environment. The second is flame vapor deposition, in which the flame oxidizes and evaporates metals at high temperatures to produce large concentrations of oxide vapors that condense onto cooler substrates in the form of nanowires and other nanostructures. In each method, the chemical composition, growth rate and morphology (shape, packing density and alignment) of the nanostructures can be finely controlled by tuning flame parameters such as the fuel/air ratio and temperature, and substrate parameters such as surface energy and temperature. Moreover, an application of flame synthesized nanowires is demonstrated for the first time. As a result of superior morphology (increased length and packing density), the photoelectrochemical water-splitting performance of flame-synthesized tungsten trioxide nanowires is more than twice that of state of the art tungsten trioxide nanowire photoanodes synthesized by conventional hydrothermal and vapor deposition methods. These flame synthesis methods may enable future generations of technologies based on metal oxide nanowires to be developed and deployed on a large scale.
Flame Synthesis And Doping Of Metal Oxide Nanowires And Their Application In Solar Water Splitting
DOWNLOAD
Author : Lili Cai
language : en
Publisher:
Release Date : 2016
Flame Synthesis And Doping Of Metal Oxide Nanowires And Their Application In Solar Water Splitting written by Lili Cai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Considering the increasing energy and environmental problems associated with the exhaustible fossil fuels, renewable energy conversion devices have attracted tremendous attention, which hold the promise to supply the fuel and electricity in a sustainable way. For many of these devices, such as batteries, fuel cells, solar cells and solar water splitting cells, metal oxides are very important functional materials due to their earth abundance, good stability and diverse properties. Recently nanowire-based metal oxides have enabled revolutionary advances in various energy conversion devices, because of their unique physical and chemical properties resulting from the high aspect ratio and large surface area. Despite their advantages, practical applications of metal oxide nanowires are hindered, as conventional synthesis methods have limitations for large scale production. Flame synthesis can potentially solve this large-scale production issue for metal oxide nanowires, given its demonstrated scalability in the industrial production of nanoparticles. However, only until very recently has flame synthesis been applied to metal oxide nanowires. More research is needed to develop advanced flame synthesis method for metal oxide nanowires, to understand the mechanism to well control the size, shape and compositions for reliable manufacture, and to evaluate their quality and functionalities in real devices. This thesis presents a novel flame vapor deposition method for the synthesis of metal oxide nanowires with the capabilities of rapid rate, good uniformity over large area and broad substrate choice. Through the investigation of growth mechanism, good control over the morphology and composition was achieved by tuning the process parameters such as fuel/air ratio, source temperature, substrate material and temperature. In addition to synthesis, flame-based doping method (sol-flame doping) was innovated for controllable doping of metal oxide NWs to modify the properties of host materials at the nanometer scale. This sol-flame doping method not only preserves the morphology and crystallinity of the host NWs, but also allows fine control over the dopant concentration by simply varying the concentration of dopant precursor solution. With this method, significant enhancement of the electrocatalytic activity towards oxygen evolution reaction was achieved for TiO2 NWs (up to 760 mV reduction of the overpotential), attributing to simultaneously improved surface charge transfer kinetics and increased bulk conductivity by doping. Finally, the flame-synthesized metal oxide nanowires were implemented as a photoanode in photoelectrochemical water splitting. By rational design and scalable fabrication, the WO3/BiVO4/Ni:FeOOH composite nanowire photoanode generated a high photocurrent of 4.5 mA/cm2 at a potential of 1.23 VRHE under simulated sunlight, which is among the highest produced by any WO3/BiVO4 based photoanodes. With the demonstrated rapid rate, good controllability and superior performance of the flame-produced metal oxide nanowires, these flame synthesis and doping methods can potentially enable future generation of energy devices by removing the barrier for large-scale production of tailored metal oxide nanowires.
Metal Oxide Nanocomposites
DOWNLOAD
Author : B. Raneesh
language : en
Publisher: John Wiley & Sons
Release Date : 2021-02-17
Metal Oxide Nanocomposites written by B. Raneesh and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-17 with Technology & Engineering categories.
Metal Oxide Nanocomposites: Synthesis and Applications summarizes many of the recent research accomplishments in the area of metal oxide-based nanocomposites. This book focussing on the following topics: Nanocomposites preparation and characterization of metal oxide nanocomposites; synthesis of core/shell metal oxide nanocomposites; multilayer thin films; sequential assembly of nanocomposite materials; semiconducting polymer metal oxide nanocomposites; graphene-based metal and metal oxide nanocomposites; carbon nanotube–metal–oxide nanocomposites; silicon mixed oxide nanocomposites; gas semiconducting sensors based on metal oxide nanocomposites; metal ]organic framework nanocomposite for hydrogen production and nanocomposites application towards photovoltaic and photocatalytic.
Flame Synthesis Of Transition Metal Oxide Nanoforms
DOWNLOAD
Author : Walmy Cuello Jimenez
language : en
Publisher:
Release Date : 2010
Flame Synthesis Of Transition Metal Oxide Nanoforms written by Walmy Cuello Jimenez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Flame spraying categories.
Semi Conducting Metal Oxide Nanoparticles From A Low Pressure Premixed H 1tn2 O 1tn2 Ar Flame Synthesis And Characterization
DOWNLOAD
Author : Pascal Onyibo Ifeacho
language : en
Publisher: Cuvillier Verlag
Release Date : 2008
Semi Conducting Metal Oxide Nanoparticles From A Low Pressure Premixed H 1tn2 O 1tn2 Ar Flame Synthesis And Characterization written by Pascal Onyibo Ifeacho and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Synthesis And Applications Of Metal Oxide Nanowires
DOWNLOAD
Author : Li-Chia Tien
language : en
Publisher:
Release Date : 2008
Synthesis And Applications Of Metal Oxide Nanowires written by Li-Chia Tien and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
The growth of epitaxial SnO2 on c-sapphire using pulsed laser deposition is examined. X-ray diffraction analysis shows that the films are highly a-axis oriented SnO2 with the rutile structure. The effects of Ga doping on SnO2 films were studied. The Hall data showed p-type behavior occurs only at specific growth condition, but converted back to n-type and degraded as time proceeds.
Investigating Flame Based Synthesis Of Carbon Nanotubes And Metal Oxide Nanowires
DOWNLOAD
Author : Fusheng Xu
language : en
Publisher:
Release Date : 2007
Investigating Flame Based Synthesis Of Carbon Nanotubes And Metal Oxide Nanowires written by Fusheng Xu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Nanotubes categories.
The synthesis of carbon nanotubes (CNTs) and metal-oxide nanowires (e.g. ZnO, WO2.9) are examined experimentally by inserting probes into various flame geometries at atmospheric pressure. The main probed-flame configurations are the inverse co-flow diffusion flame (IDF) and the counter-flow diffusion flame (CDF), which are compared with each other to assess the translatability of local synthesis conditions in producing the same growth attributes and morphologies. The CDF is characterized using laser-based spontaneous Raman spectroscopy (SRS), and validated with simulations using detailed chemical kinetics and transport. SRS is used to measure local conditions in the 2-D axi-symmetric IDF. Properties of the as-synthesized nanostructures are determined by field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDXS), and resonance Raman spectroscopy (RRS). Various morphologies of CNTs are grown catalytically on metal-alloy substrates of different compositions (i.e., Fe, Fe/Cr, Ni/Cu, Ni/Ti, Ni/Cr, Ni/Cr/Fe), as well as on metal-oxide solid solutions (i.e. NiAl2O4, CoAl2O4 and ZnFe2O4). Vertically well-aligned multi-walled CNTs (MWNTs) with uniform diameters are obtained from Ni/Cr/Fe and Ni/Ti alloys. CNTs produced from ZnFe2O4 substrates are found to be a mixture of MWNTs and single-walled carbon nanotubes (SWNTs) with at least 30% SWNTs by number. Effects of local gas-phase temperature, substrate temperature, carbon-based precursor species concentrations, and substrate voltage bias on CNT formation, diameter, growth rate, yield, density, and morphology are investigated. Aligned single-crystal tungsten oxide nanowires with diameters of 20-50nm are grown directly from tungsten substrates at high rates, with local gas-phase temperature and chemical species specified at the substrate for self-synthesis. Voltage bias is shown to dramatically alter the morphologies of the as-synthesized WOx nanomaterial. Single-crystalline ZnO nanowires are grown directly on zinc-plated steel substrates at high rates with no catalysts. Larger-diameter (>100nm) nanowires are produced at higher temperatures; while smaller-diameter (25-40nm) nanowires are produced at lower temperatures, and only on the fuel side of the reaction zone. Reactions with H2O appear to be the dominant route for nanowire synthesis. Nanoribbons and other nanowire-based morphologies are also found and discussed.
Metal Oxide Based Nanofibers And Their Applications
DOWNLOAD
Author : Vincenzo Esposito
language : en
Publisher: Elsevier
Release Date : 2021-10-25
Metal Oxide Based Nanofibers And Their Applications written by Vincenzo Esposito and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-25 with Technology & Engineering categories.
Metal Oxide-based Nanofibers and their Applications provides an in-depth overview on developments surrounding the synthesis, characterization properties, and applications achieved by scientific leaders in the area. Sections deal with the theoretical and experimental aspects of the synthesis and methodologies to control microstructure, composition and shape of the nanofibrous metal oxides, review the applications of metal oxide nanofibers in diverse technologies, with special focus on the relation between the structural, morphological and compositional features of the nanofibers, cover applications of metal oxide nanofibers in the fields of sensing (biosensing, gas sensing), and consider biomedical and cleaning technologies. Lastly, a final section covers their application in energy generation and storage technologies (e. g. piezoelectric, solar cells, solid oxide fuel cells, lithium-ion batteries, supercapacitors, and hydrogen storage are reviewed. Reviews electrospinning methods for the synthesis and design of nanocomposites and hybrid metal oxide nanofibers Discusses applications of metal oxide nanofibers in sensing, biomedical fields, cleaning technologies, and energy Emphasizes the structural, morphological and compositional properties of nanofibers and their effect on device performance
Investigating Local Growth Conditions In The Flame Synthesis Of Metal Oxide Nanostructures
DOWNLOAD
Author : Cassandra D'Esposito
language : en
Publisher:
Release Date : 2009
Investigating Local Growth Conditions In The Flame Synthesis Of Metal Oxide Nanostructures written by Cassandra D'Esposito and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Flame categories.
The synthesis of metal-oxide nanowires (i.e. WO2.9, ZnO, Cu2O, and Fe3O4) and nanoplates (i.e. MoO2) is examined experimentally with metal-substrate probes inserted into counter-flow diffusion flames (CDFs) at atmospheric pressure. The quasi-one-dimensional flow field allows for correlation between morphologies and local growth conditions, as well as the tailoring of the flame structure, through computational simulations with detailed chemical kinetics and transport, to provide conditions suitable for gas-phase growth of nanostructures. Comparisons of products synthesized between methane and hydrogen flames, as well as between locations probed on either the fuel side or the air side of the reaction zone, permit evaluation of the roles of O2 versus H2O versus CO2 in the oxidative route(s) involved. The as-synthesized nanostructures are characterized by field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray spectroscopy (EDXS). Tungsten oxide nanowires are grown with diameters ranging from 50 to 200 nm at 1720K. The crystal structure is tetragonal WO2.9, but the growth directions vary with flame conditions. Single-crystal ZnO nanostructures are formed at 1000, 1300, and 1600K. All growth mechanisms are possible based on Gibbs free energy calculations. Molybdenum oxide nanoplates are grown in the methane flame at 2000K on both the air and fuel sides, where similar amounts of H2O and CO2 are found. In the hydrogen flame, oxidized structures are grown on the air side, and micron sized plates are synthesized on the fuel side. Cu2O nanowires are grown only on the air side of the methane and hydrogen flames, where large amounts of oxygen are present. The fuel sides of both flames show nucleation sites on the surface but no nanowire growth. Iron oxide nanowires are formed on the air side of the methane and hydrogen flames. Carbon nanotubes and nanowires are grown on the fuel side of the methane flame, while iron-oxide nodules are formed on the fuel side of the hydrogen flame.
On Flame Synthesis Of Metal Oxide Nanoparticles
DOWNLOAD
Author : Manfred Geier
language : en
Publisher:
Release Date : 2009
On Flame Synthesis Of Metal Oxide Nanoparticles written by Manfred Geier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Ceramics categories.