Department of Chemical and Environmental Engineering and Center for Nanoscale Science and Engineering, University of California-Riverside, Riverside, CA 92521, USA.
Nanotechnology. 2010 Feb 19;21(7):75502. doi: 10.1088/0957-4484/21/7/075502. Epub 2010 Jan 18.
Electrical and gas sensing properties of single-walled carbon nanotube networks functionalized with polyaniline (PANI-SWNTs) were systematically investigated to understand the gas sensing mechanisms and optimize sensing performance. The temperature-dependent electrical resistance and field-effect transistor (FET) transfer characteristics indicated that the electrical properties of PANI-SWNTs are dominated by the PANI coating. The FET transfer characteristics of PANI-SWNTs exposed to different NH(3) concentrations indicated that the dominant sensing mechanism is the deprotonation of PANI by NH(3). Sensing experiments with different gas analytes revealed that PANI-SWNTs responded positively to NH(3), and negatively to NO(2) and H(2)S with sensitivities of 5.8% per ppm(v) of NH(3), 1.9% per ppm(v) of NO(2), and 3.6% per ppm(v) of H(2)S. The lower detection limits were 50, 500, and 500 ppb for NH(3), NO(2), and H(2)S, respectively.
采用聚苯胺（PANI-SWNTs）对单壁碳纳米管网络进行功能化，系统研究了其电气和气体传感性能，以了解气体传感机制并优化传感性能。温度相关的电阻和场效应晶体管（FET）传输特性表明，PANI-SWNTs 的电气性能主要由 PANI 涂层决定。PANI-SWNTs 暴露于不同 NH（3）浓度下的 FET 转移特性表明，主要的传感机制是 NH（3）使 PANI 去质子化。对不同气体分析物的传感实验表明，PANI-SWNTs 对 NH（3）呈正响应，对 NO（2）和 H（2）S 呈负响应，NH（3）的灵敏度为每 ppm（v）5.8%，NO（2）的灵敏度为每 ppm（v）1.9%，H（2）S 的灵敏度为每 ppm（v）3.6%。NH（3）、NO（2）和 H（2）S 的检测下限分别为 50、500 和 500 ppb。
