Gas sensors based on thick films of semi-conducting single walled carbon nanotubes
Gas sensors based on thick films of semi-conducting single walled carbon nanotubes
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DOI：
10.1016/j.carbon.2011.04.054
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发表时间：
2011-09-01
期刊：
影响因子：
10.9
通讯作者：
Loiseau, Annick
中科院分区：
文献类型：
--
作者：
Battie, Yann;Ducloux, Olivier;Loiseau, Annick
比较研究了分选的半导体单壁碳纳米管（SWCNT）膜和未分选的SWCNT膜的气敏应用。传输线方法被用来分别监测单壁碳纳米管膜电阻和电极与单壁碳纳米管之间的接触电阻，从而揭示了传感机制主要依赖于在气体暴露过程中的管电导率的修改。制造的传感器表现出20 ppb的NO2和600 ppb的NH3的检测限主要归因于实验设置的限制。此外，半导体纳米管对NH3的敏感性是未分选的纳米管的2.5倍，从而证明了通过对单壁碳纳米管进行分选可以提高选择性。传感器的灵敏度的温度依赖性进行了研究，并发现实验结果和Langmuir吸附模型之间的一个很好的协议。(C)2011爱思唯尔有限公司保留所有权利。
A comparative study was made of sorted semi-conducting single walled carbon nanotube (SWCNT) films and unsorted SWCNT films for gas sensing applications. The transmission line method is used to monitor separately the SWCNTs film resistance and the contact resistance between electrodes and the SWCNTs, thus revealing that the sensing mechanism mainly relies on a modification of the tube conductivity during gas exposure. The fabricated sensors demonstrate a detection limit of 20 ppb NO2 and 600 ppb NH3 mainly attributed to experimental setup limitations. Moreover, semi-conducting nanotubes happened to be 2.5 times more sensitive to NH3 than unsorted ones, thus proving that selectivity can be improved by sorting the SWCNTs. The temperature dependence of the sensor sensitivity was studied, and a good agreement was found between experimental results and the Langmuir adsorption model. (C) 2011 Elsevier Ltd. All rights reserved.