Highly sensitive gasochromic H₂ sensing by nano-columnar WO₃-Pd films with surface moisture

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• 作者：Young-Ahn Lee^aAuthor Vitae ; Shankara S. Kalanur^aAuthor Vitae ; Gowoon Shim^aAuthor Vitae ; Jucheol Park^cAuthor Vitae ; Hyungtak Seo^a ; ^b ; ^{hseo@ajou.ac.kr" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Gasochromic ; Hydrogen ; Sensor ; WO3 ; Pd
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：238
• 期：Complete
• 页码：111-119
• 全文大小：2681 K

文摘

H₂ is a fuel with advantages that include being recyclable, abundant, and environmentally friendly. It has been intensively studied as an attractive renewable energy carrier. However, H₂ detection is a necessary safety concern, because the fuel is explosive at concentrations above 4% in air. In this study, a very sensitive and reliable visual gasochromic H₂ sensor is fabricated by vacuum deposition for detecting H₂ gas leaks by a simple change of colour. A thin amorphous and nanoporous WO₃ film was deposited on a glass substrate by RF sputtering, and palladium nanoparticles prepared by e-beam evaporation were used as a catalyst to decompose H₂ molecules. We have characterized the structural, optical, and chemical properties of the nanohybrid Pd-WO₃ sensor. The sensor exhibited excellent gasochromic performance upon exposure to 1% H₂ in air with a transmittance change of >50% and a colour difference (ΔE) of 52 after 10 min exposure. All fabrication was done at room temperature, and the development of a flexible sensor is described.