碳纳米管
材料科学
辛烯
共聚物
石墨烯
乙烯
热电效应
化学工程
碳氢化合物
傅里叶变换红外光谱
碳纤维
复合材料
复合数
有机化学
纳米技术
聚合物
化学
催化作用
物理
工程类
热力学
作者
Petr Slobodian,P. Říha,Robert Olejník,Ruhan Benlikaya
出处
期刊:Carbon
[Elsevier]
日期:2016-12-01
卷期号:110: 257-266
被引量:18
标识
DOI:10.1016/j.carbon.2016.09.023
摘要
We designed a novel self-powered thermoelectric vapor sensor, whose thermogenerated voltage was modulated by chemical vapors. The sensor was made of composites of oxidized multi-walled carbon nanotubes within ethylene-octene copolymer. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy of the multi-walled carbon nanotubes within ethylene-octene copolymer showed that the oxidation with HNO3 or KMnO4 enhanced its p-type electrical conductivity and that the thermoelectric power increase was proportional to the formation of new oxygen-containing functional groups on the surface of carbon nanotubes. When this composite was subjected to a saturated vapor of either heptane (aliphatic hydrocarbon), toluene (aromatic hydrocarbon) or ethanol (alcohol), its respective relative resistance increased in average by 3.6, 1.1 and 0.05. Consequently, the magnitude of voltage generated by the thermoelectric device containing the oxidized multi-walled carbon nanotubes within ethylene-octene copolymer determined the absence or presence of the aforementioned chemical vapors.
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