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首页> 外文期刊>Journal of Materials Science >A hybrid gas-sensing material based on porous carbon fibers and a TiO _2 photocatalyst
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A hybrid gas-sensing material based on porous carbon fibers and a TiO _2 photocatalyst

机译：基于多孔碳纤维和TiO _2光催化剂的混合气敏材料

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摘要

The electrode material for a gas sensor was prepared from electrospun carbon fibers. The electrode material was chemically activated to enlarge the gas adsorption sites, and carbon nanotubes (CNTs) were embedded into the polyacrylonitrile-based carbon fibers to enhance their electrical conductivity. TiO_2 was used as an additive to promote NO gas degradation and to improve their response in NO gas sensing. The chemical activation process increased the specific surface area and pore volume of the carbon fibers to values in excess of 2000 m~2/g and 1.0 ml/g, respectively. To investigate the photocatalytic effects of the TiO_2 additive, NO gas sensing was conducted in the presence and absence of ultraviolet irradiation. The subsequent results indicate that the response of the sensor was improved due to the TiO_2-photocatalyzed decomposition of NO gas and the subsequent adsorption of HNO_2, NO_2, and HNO_3. The electrical resistance of the sensor was significantly reduced during NO gas sensing due to the electron hopping effect, and highly efficient gas adsorption was observed. In conclusion, a sensitive gas sensor electrode was realized by fabricating a porous material to increase the efficiency of gas adsorption, adding CNTs to improve its electrical conductivity and adding TiO_2 photocatalysts to promote NO decomposition.
机译：气体传感器的电极材料由电纺碳纤维制成。电极材料经过化学活化处理以扩大气体吸附位，并将碳纳米管（CNT）嵌入聚丙烯腈基碳纤维中以增强其导电性。 TiO_2被用作促进NO气体降解并改善其在NO气体感测中的响应的添加剂。化学活化过程将碳纤维的比表面积和孔体积分别增加到超过2000m 2 / g和1.0ml / g的值。为了研究TiO_2添加剂的光催化作用，在有无紫外线照射下进行NO气敏。随后的结果表明，传感器的响应由于TiO_2光催化的NO气体分解以及随后的HNO_2，NO_2和HNO_3的吸附而得到改善。由于电子跳变效应，在NO气体感测期间，传感器的电阻显着降低，并且观察到了高效的气体吸附。总之，通过制造多孔材料以提高气体吸附效率，添加CNT以提高其电导率以及添加TiO_2光催化剂以促进NO分解，实现了灵敏的气体传感器电极。

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