期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 130, 期 1, 页码 222-230出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2007.07.141
关键词
indium oxide; tin oxide; indium-tin oxide; sol-gel routes; gas sensors
In2O3-SnO2 nanocrystals have been synthesized by a non-aqueous sol-gel technique with the aim to test them as sensing element in resistive gas sensors. ne whole range of compositions between pure indium oxide and 100% tin oxide, was investigated. XRD, FT-IR, TEM and HRTEM analyses of the synthesized nanopowders give evidence for remarkable structural and sizing variations depending on the tin concentration. In particular, with increasing tin content the mean crystallite size decreases, from 25 nm down to 1-2 nm and, at content higher than 75 wt%, it causes a modification of the lattice structure from cubic to tetragonal. Electrical and sensing tests in dry air have been performed on planar sensor devices in thick film configuration depositing In2O3-SnO2 nanocrystals by screen-printing. CO and C2H5OH have been tested as gas target. The results obtained are discussed in relation to the chemical and microstructural properties of the synthesized In2O3-SnO2 nanocrystals. (C) 2007 Elsevier B.V. All rights reserved.
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