Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 173, Issue -, Pages 824-832Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.07.120
Keywords
Gasochromic coloration; Pt-WO3 nanowire; Self-heating; Spillover
Funding
- National Natural Science Foundation of China [U0634002, 50672135, 50725206]
- Science and Technology Ministry of China [2007CB935501, 2003CB314701]
- Guangdong Natural Science Foundation [s2011040000636]
- Science and Technology Department of Guangdong Province
- Department of Information Industry of Guangdong Province
- Science and Technology Department of Guangzhou City
- Foundation for Distinguished Young Talents in Higher Education of Guangdong [LYM11123]
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We report here the resultant effect of self-heating phenomenon on gasochromic coloration of WO3 nanowire films covered by Pt nanoparticles (Pt-WO3). Ultrafast coloration of Pt-WO3 nanowire films on millisecond scale (less than 10 ms), which is the fastest coloration process of tungsten oxide, is observed. We have found that a unique self-heating is the major cause for speeding up the coloration process. Such self-heating occurs after several cycles of coloration and bleaching in air, without extra heater, and as a result the temperature of nanowire film can increase to above 200 degrees C from room temperature. The characteristics and the underlying mechanism of the self-heating have been studied in depth. It is proposed that persistent and rapid catalytic reaction between H-2 and O-2 causes heating of Pt-WO3 nanowire. The relation between the maximum temperature of the sample reached by exposure to H-2 gas and the gas concentration can be described by a simple kinetic model, and it predicts that the down scaling of the nanowire diameter may enhance self-heating. (C) 2012 Elsevier B.V. All rights reserved.
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