SnO₂ nanoparticle-coated In₂O₃ nanofibers with improved NH₃ sensing properties

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• 作者：Qi Qi ; Pei-Pei Wang ; Jun Zhao ; Liang-Liang Feng ; Li-Jing Zhou ; Rui-Fei Xuan ; Yi-Pu Liu ; Guo-Dong Li
• 关键词：SnO2 ; In2O3 ; Semiconductors ; NH3 ; Gas sensors
• 刊名：Sensors and Actuators B: Chemical
• 出版年：April, 2014
• 年：2014
• 卷：194
• 期：Complete
• 页码：440-446
• 全文大小：3013 K

文摘

SnO₂ nanoparticles and In₂O₃ nanofibers are synthesized via a sol-gel process and an electrospinning method, respectively. Excellent sensing materials for NH₃ detection are achieved by coating SnO₂ nanoparticles on In₂O₃ nanofibers. When the as-prepared sensors were exposed to 1 ppm NH₃ at room temperature, the response is 21, and the response and recovery times are 7 and 10 s, respectively. With this method, NH₃ can be detected down to a concentration of 0.1 ppm, and the corresponding response is about 2. The selectivity and stability of the sensors are satisfactory for gas sensing. And the surface coating is proved to be an effective method for the sensing enhancement of one-dimensional nanomaterials.