Mesoporous Nanocrystalline SnO2 Prepared by Polyethylene Glycol Addition and Their Gas Sensing Properties
Mesoporous nanocrystalline SnO2 have been prepared using a polyethylene glycol (PEG) modified sol–gel process followed by annealing in air. The structure, morphology and gas sensing properties of the nanocrystalline SnO2 were investigated. It is confirmed that the content of polyethylene glycol in the precursor solution was slight influence on the structure of SnO2 by X-ray diffraction analysis, scanning electron microscope, transmission electron microscopy and the measurement of specific surface area and pore size distribution using a N2 adsorption isotherm. Gas sensing properties of their indirectly heated sensor to various gases (C2H5OH, C6H6 and H2) were tested in ambient air. These sensors showed a high response to ethanol, acetone, formaldehyde and methanol, and low response to benzene, toluene and H2. The reasons for the sensing characteristics of these sensors were discussed.
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Document Type: Research Article
Publication date: August 1, 2013
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