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溶胶–凝胶法制备碳纳米管–In2O3纳米复合材料及其气敏性
作者:王雪静 刘贯军 朱芳坤 胡林峰 
单位:1. 河南科技学院化学化工学院 河南 新乡 453003 2. 河南科技学院机电学院 河南 新乡 453003 
关键词:碳纳米管–氧化铟 纳米复合材料 溶胶–凝胶法 气敏性 
分类号:0472.1
出版年,卷(期):页码:2012,40(3):391-395
DOI:
摘要:

 要:以碳纳米管(carbon nanotubesCNT)为模板,在超声波辅助条件下,利用溶胶凝胶法合成CNT–In2O3纳米复合粉体,用该复合粉体制备CNT–In2O3气敏元件。借助X射线衍射、透射电子显微镜、傅立叶变换红外光谱仪和能量色散谱仪对产物进行表征,研究了CNT–In2O3气敏元件的气敏性。结果表明:CNT–In2O3纳米复合粉体是一种由In2O3纳米颗粒均匀包裹在直径约为2030 nm的碳纳米管上的纳米复合材料。CNT–In2O3气敏元件在低温对NO2有较高的灵敏度,该元件对NO2的灵敏度高于纯In2O。当CNTInC13·4H2O的摩尔比为3:10时,CNT–In2O3气敏元件对NO2的灵敏度最大,且灵敏度随NO2浓度的增大而增大。该气敏元件在200 时对NO2的响应时间为10 s,恢复时间为70 s

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Abstract: The carbon nanotube (CNT)–In2O3 nanocomposites were synthesized by a sol–gel method using CNT as a template under ultrasonic radiation. The samples were characterized by X-ray diffractometer, transmission electron microscope, Fourier transform infrared spectrometer and energy dispersive spectrometer, respectively. The gas sensitive performances of the sensors made from the CNT–In2O3 nanocomposites were investigatedThe results show that the nanocomposites are composed of CNTs with the diameter of 20–30 nm coated evenly by In2O3 particles. The sensor made from the nanocomposite had a higher sensitivity to NO2 at a low temperature. The sensitivity of the CNT–In2O3 nanocomposites to NO2 gas was higher than that of pure In2O3. The CNT–In2O3 sensor (mole ratio of CNT to InC13·4H2O of 3:10) had the highest sensitivity to NO2. The sensitivity of sensor increased with increasing the concentration of NO2. The response time of the sensor to NO2 at 200 ℃ was 10 s and the recovery time was 70 s.

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基金项目:
国家自然科学基金(20871042)资助项目。
作者简介:
第一作者:王雪静(1967—),女,博士,副教授。
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