Self-heating effect and its occurrence mechanism in the gasochromic coloration of Pt coated WO₃ nanowire films

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• 作者：Jian Yi Luo^a ; ^{luojiany@mail3.sysu.edu.cn" class="auth_mail}Author Vitae ; Wei Li^aAuthor Vitae ; Feng Chen^bAuthor Vitae ; Xue Xian Chen^aAuthor Vitae ; Wei Da Li^aAuthor Vitae ; Hao Yuan Wu^aAuthor Vitae ; Yao Ji Gao^aAuthor Vitae ; Qing Guang Zeng^aAuthor Vitae
• 关键词：Self-heating effect ; Gasochromic coloration ; Pt-coated WO3 nanowire ; Heat production rate ; Heat dissipation rate
• 刊名：Sensors and Actuators B: Chemical
• 出版年：5 July, 2014
• 年：2014
• 卷：197
• 期：Complete
• 页码：81-86
• 全文大小：1569 K

文摘

A self-heating effect has been observed in the gasochromic coloration of Pt coated WO₃ (Pt-WO₃) nanowire films, and its temperature rise rate is found to be strongly dependent on the initial temperature and the time of the sample exposed to air. X-ray photoelectron spectroscopy is applied to investigate the catalyst poisoning and reactivation of Pt-WO₃ nanowires in air, and the results indicate that the Pt nanoparticles can be poisoned by chemisorbed oxygen atoms in air, causing the self-heating effect to be suppressed at room temperature. The mechanism response for the occurrence of the self-heating effect has also been discussed in depth.