Gas sensing characteristics of multi-wall carbon nanotubes
Gas sensing characteristics of multi-wall carbon nanotubes
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DOI：
10.1016/s0925-4005(01)00923-6
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发表时间：
2001-12-15
影响因子：
8.4
通讯作者：
Grimes, CA
中科院分区：
文献类型：
--
作者：
Varghese, OK;Kichambre, PD;Grimes, CA
采用阻抗谱法研究了以多壁碳纳米管（MWNTs）作为活性传感元件的电容式和电阻式传感器的气敏行为。研究表明，还原性气体在多壁碳纳米管表面发生化学吸附。随着湿度的增加以及氨、一氧化碳和二氧化碳分压的升高，观察到传感器阻抗增大。阻抗变化归因于半导体多壁碳纳米管中的p型导电性，以及金属和半导体纳米管之间肖特基势垒的形成。多壁碳纳米管传感器对湿度、一氧化碳和二氧化碳表现出可逆的响应行为。多壁碳纳米管传感器对氨有强烈响应，可作为剂量计。（C）2001爱思唯尔科学出版社。版权所有。
Impedance spectroscopy was used to study the gas sensing behavior of both capacitance and resistance based sensors employing multi-wall carbon nanotubes (MWNTs) as the active sensing element. Studies revealed the chemisorption of reducing gases upon the surface of the MWNTs. Increasing sensor impedance was observed with increasing humidity or partial pressures of ammonia, carbon monoxide, and carbon dioxide. The impedance changes are attributed to p-type conductivity in semiconducting MWNTs, and the formation of Schottky barriers between the metallic and semiconducting nanotubes. Reversible behavior is demonstrated for the MWNT sensors in response to humidity, carbon monoxide and carbon dioxide. The MWNT sensors strongly respond to ammonia behaving as dosimeters. (C) 2001 Elsevier Science B.V. All rights reserved.