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Effect of Temperature on Synthesis and Gas Sensing of Nanostructured SnO2

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Nanoparticles of SnO2 have been synthesized using the sol–gel method. In this work, the growth of nanoparticles has been investigated at different annealing temperatures (ranging from 600 °C to 900 °C). Their structural and morphological analysis was carried out by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results showed that the nanoparticles are highly crystalline with tetragonal rutile phase. The degree of crystallinity and grain size calculated from the XRD patterns has been found to be increasing with annealing temperature. The annealing temperature has been found to be playing a critical role of controlling nanostructure size. The SEM micrographs revealed the growth of nanoparticles at different annealing temperatures. UV-Vis spectroscopy has been used to deduce the band gap of nanostructured SnO2. These pellets were tested for current–voltage (I–V) measurements and also tested for gas sensing of H2 (1%) gas at an operating temperature of 300 °C. The investigations show that the sensing response of specimens is size dependent. A detailed study of these synthesized nanostructured samples is presented and discussed in the paper.
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Keywords: Annealing; Gas Sensing; Nanoparticles; Recovery; Resistance; Response; SEM; Sensitivity; SnO2; Sol-Gel; XRD

Document Type: Research Article

Affiliations: Department of Physics, Malaviya National Institute of Technology Jaipur 302017, Rajasthan, India

Publication date: November 1, 2016

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