Gas sensing and Electrical Properties of Metal oxide Nanostructures: Nanostructures, Synthesis, sensors, sensing mechanism, LEDs, FETs, Carbon nanotubes, graphene, Supercapacitors

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In the last few years, a little word has attracted enormous attention, and investigation from all over the world. The word is ?nano?. What it presents in terms of science and technology, which are also called nanoscience and nanotechnology, is much more than just a word describing a specific length scale. It has dramatically changed every aspect of the way we think in science and technology and will certainly bring more and more surprises into our daily life as well as into the world of the future. This thesis consists of four parts of which Part-1 gives a brief overview of the synthesis, properties and applications of nanomaterials. Part-2 deals with the synthesis and characterization of different nanostructures of metal oxides and a detailed study of their gas sensing characteristics. Part-3 of the thesis contains results of studies on the electrical properties and hydrogen-sensing characteristics of field effect transistors (FETs) based on nanorods of ZnO and WO2.72. Part-4 of the thesis deals with the supercapacitive behavior of RuO2 and IrO2 functionalized mesoporous carbon and results of studies on the interaction of SWNTs with electron donor and acceptor molecules.

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Properties and Applications of Carbon Nanotube Films

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Since 1950, the adage has been “silicon for electronics, carbon for life.” However, the discovery in 1993 of the single-wall carbon nanotube (SWNT), sparked interest in everyone from scientists to VCs over the electric potential of SWNTs, particularly for use in flexible or printable electronics. This book provides an overview of the fabrication, properties, and applications of thin films (networks) of SWNTs. Various aqueous phase dispersion and coating methods on rigid and flexible substrates will be explored. Fundamental transport studies on films of various densities, as a function of temperature and frequency, are fit to theory. Thin, transparent films of SWNTs (and graphene) are fabricated, and evaluated for use in applications that require a transparent electrode, such as touch screens, displays, and solar cells. Solution deposited films are made into FETs for the first demonstration of a transparent SWNT transistor. Finally, the photophysics of a por­phyrin/SWNT composite are measured, and evaluated for possible uses as an artificial eye. This book should prove especially useful for professionals in the fields of nanotechnology and flexible electronics.

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