Quantum dots as mediators in gas sensing: A case study of CdS sensitized WO₃ sensing composites

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• 作者：Isabella Concina ; Elisabetta Comini ; Saulius Kaciulis ; Giorgio Sberveglieri
• 关键词：Chemical gas sensors ; CdS quantum dots ; SILAR technique
• 刊名：Applied Surface Science
• 出版年：30 January, 2014
• 年：2014
• 卷：290
• 期：Complete
• 页码：295-300
• 全文大小：1974 K

文摘

In this study the proof of principle of the use of naked semiconductor directly generated on metal oxide surface as mediators in gas sensing is provided. Successive ionic layer absorption and reaction (SILAR) technique has been applied to sensitize a WO₃ thin film with CdS quantum dots. Response to gases of bare WO₃ is deeply modified: quantum dots dramatically increase the metal oxide conductance, otherwise rather poor, and modify the capability of detecting environmental pollutants, such as CO and NO₂. A modified sensing mechanism is proposed to rationalize the mediation exerted by the semiconducting active layer on the interaction between gaseous species and WO₃ surface.