Near Room Temperature, Fast-Response, and Highly Sensitive Triethylamine Sensor Assembled with Au-Loaded ZnO/SnO2 Core鈥揝hell Nanorods on Flat Alumina Substrates

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• 作者：Dian-Xing Ju ; Hong-Yan Xu ; Zhi-Wen Qiu ; Zi-Chao Zhang ; Qi Xu ; Jun Zhang ; Jie-Qiang Wang ; Bing-Qiang Cao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：7
• 期：34
• 页码：19163-19171
• 全文大小：711K
• ISSN：1944-8252

文摘

Chemiresistive gas sensors with low power consumption, fast response, and reliable fabrication process for a specific target gas have been now created for many applications. They require both sensitive nanomaterials and an efficient substrate chip for heating and electrical addressing. Herein, a near room working temperature and fast response triethylamine (TEA) gas sensor has been fabricated successfully by designing gold (Au)-loaded ZnO/SnO₂ core鈥搒hell nanorods. ZnO nanorods grew directly on Al₂O₃ flat electrodes with a cost-effective hydrothermal process. By employing pulsed laser deposition (PLD) and DC-sputtering methods, the construction of Au nanoparticle-loaded ZnO/SnO₂ core/shell nanorod heterostructure is highly controllable and reproducible. In comparison with pristine ZnO, SnO₂, and Au-loaded ZnO, SnO₂ sensors, Au-ZnO/SnO₂ nanorod sensors exhibit a remarkably high and fast response to TEA gas at working temperatures as low as 40 掳C. The enhanced sensing property of the Au-ZnO/SnO₂ sensor is also discussed with the semiconductor depletion layer model introduced by Au-SnO₂ Schottky contact and ZnO/SnO₂ N鈥揘 heterojunction.