Effect of orthorhombic phase on hydrogen gas sensing property of thick-film sensors fabricated by nanophase tin dioxide

Authors
Ahn, JPKim, SHPark, JKHuh, MY
Issue Date
2003-09-01
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.94, no.2, pp.125 - 131
Abstract
Nanophase metallic tin powder was synthesized by an inert gas condensation method and subsequently oxidized into two types of SnO2 by two heat-treatment routes: (1) after annealing up to 900degreesC in air, the synthesized powder was oxidized to form a mixture of tetragonal and orthorhombic SnO2, and (2) the synthesized powder was transformed into an amorphous tin oxide by intermediate annealing at 225degreesC. The amorphous tin nano-particles were oxidized into a single phase of tetragonal SnO2 during heat treatment up to 900degreesC in air. The sensitivity of the sensors fabricated from two types of nanophase SnO2 powders was evaluated by means of electrical resistance measurements. The thick-film sensors fabricated by the mixed SnO2 powder exhibited a lower sensitivity to hydrogen than those fabricated by the single tetragonal SnO2 powder. TEM observations and EPR measurements were carried out in order to interpret the role of the orthorhombic phase in gas sensing. The detrimental effect of orthorhombic SnO2 on the sensitivity was attributed to an increased number of planar defects in the microstructure and a change in species of oxygen absorbents on the surface layer of the SnO2. (C) 2003 Elsevier B.V. All rights reserved.
Keywords
SNO2; SNO2; thick-film sensor; nanophase tin dioxide; orthorhombic tin dioxide; electron paramagnetic resonance
ISSN
0925-4005
URI
https://pubs.kist.re.kr/handle/201004/138243
DOI
10.1016/S0925-4005(03)00264-8
Appears in Collections:
KIST Article > 2003
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML

qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE