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浙江大学学报(工学版)
J4  2009, Vol. 43 Issue (5): 911-915    DOI: 10.3785/j.issn.1008-973X.2009.05.024
    
Study on gas sensing property of metal particle doped multi-walled carbon nanotubes
FANG Xiang-sheng1,2, LIU Wei-ting1,3, CHEN Yu-quan1, PAN Min1, GUO Miao1,4
(1.College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China;
2. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;
3. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027;
4. Institute of Biomedical Engineering and Instrument, Hangzhou Dianzi University, Hangzhou 310018, China)
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Abstract  

Pd and Cu particles were doped into the multi-walled carbon nanotubes (MWCNTs) preprocessed using a mixture of H2SO4 and HNO3 by means of chemical reaction method and electrochemistry method respectively. Amperometric sensors were fabricated using the original and doped MWCNTs. The responses to formaldehyde, benzene, toluene and xylene with different volume fractions were tested using an electrochemical analyzer. High sensitivity and reproducibility of these sensors indicate the feasible VOCs detection at room temperature. Metal particles doping results in great change of sensitivity and selectivity. The main impacts on the gas sensing property include: the structural defects of MWCNTs, the interaction of gas molecules and metal clusters, and the catalytic active site formed by metal particles．

Published: 18 November 2009
CLC:  TP212.3  
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Cite this article:

FANG Xiang-Sheng, LIU Wei-Ting, CHEN Yu-Quan, et al. Study on gas sensing property of metal particle doped multi-walled carbon nanotubes. J4, 2009, 43(5): 911-915.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2009.05.024     OR     http://www.zjujournals.com/eng/Y2009/V43/I5/911


金属粒子掺杂的多壁碳纳米管气敏性研究

分别利用化学还原和电化学镀覆方法,对经过浓硫酸浓硝酸混合液酸化预处理的多壁碳纳米管进行Pd和Cu的掺杂,并制备成电流型气敏传感器.以甲醛、苯、甲苯、二甲苯作为测试气体,通过电化学分析仪测试它们在不同气体种类和体积分数下的响应.实验结果表明,传感器在常温下具有较高的灵敏度和重复性,金属粒子的掺杂使传感器的灵敏性和选择性都有较大的改变.影响气敏特性的主要因素包括：碳纳米管自身的结构缺陷、气体分子与金属团簇的反应、金属粒子形成的局部催化活性中心.

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