Multi-wall carbon nanotube networks as potential resistive gas sensors for organic vapor detection
Multi-wall carbon nanotube networks as potential resistive gas sensors for organic vapor detection
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DOI：
10.1016/j.carbon.2011.02.020
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发表时间：
2011-06-01
期刊：
影响因子：
10.9
通讯作者：
Saha, P.
中科院分区：
文献类型：
--
作者：
Slobodian, P.;Riha, P.;Saha, P.
通过电阻测试研究了随机纠缠的纯碳纳米管和酸性KMnO(4)氧化的多壁碳纳米管（MWCNT）网络对各种有机溶剂蒸汽（异戊烷、乙醚、丙酮和甲醇）的敏感性。溶剂的极性由汉森溶解度参数决定，饱和蒸气的体积分数由蒸汽压决定。结果表明，暴露于有机溶剂蒸汽时，网络电阻增大，当网络与蒸汽分离时，可以观察到可逆反应。与KMnO(4)的反应增加了纳米管表面的氧含量，降低了MWCNT网络的孔隙率，提高了MWCNT网络的电阻，提高了网络对极性溶剂的选择性。所研究的MWCNT网络可以潜在地用作敏感和选择性有机蒸汽开关的传感元件。(C) 2011 Elsevier Ltd.版权所有。
The sensitivity of multi-wall carbon nanotube (MWCNT) networks of randomly entangled pure nanotubes and those oxidized with acidic KMnO(4) to various organic solvent vapors (iso-pentane, diethyl ether, acetone and methanol) has been investigated by resistance measurements. The solvents had different polarities given by Hansen solubility parameters and different volume fractions of saturated vapors defined by the vapor pressure. The results show that the network electrical resistance increases when exposed to organic solvent vapors, and a reversible reaction is observed when the network is removed from the vapors. The reaction with KMnO(4) increases oxygen content on the nanotube surface and causes lower porosity of MWCNT network as well as higher electrical resistance, which improves the network selectivity to polar solvents. The investigated MWCNT networks could be potentially used as sensing elements for sensitive and selective organic vapor switches. (C) 2011 Elsevier Ltd. All rights reserved.