Center for Nanoscale Science and Engineering, University of Kentucky, Lexington, KY 40506-0046, USA.
Nanotechnology. 2011 May 27;22(21):215502. doi: 10.1088/0957-4484/22/21/215502. Epub 2011 Mar 30.
Multi-walled carbon nanotubes (MWCNTs)-polymer composite-based hybrid sensors were fabricated and integrated into a resistive sensor design for gas sensing applications. Thin films of MWCNTs were grown onto Si/SiO(2) substrates via xylene pyrolysis using the chemical vapor deposition technique. Polymers like PEDOT:PSS and polyaniline (PANI) mixed with various solvents like DMSO, DMF, 2-propanol and ethylene glycol were used to synthesize the composite films. These sensors exhibited excellent response and selectivity at room temperature when exposed to low concentrations (100 ppm) of analyte gases like NH(3) and NO(2). The effect of various solvents on the sensor response imparting selectivity to CNT-polymer nanocomposites was investigated extensively. Sensitivities as high as 28% were observed for an MWCNT-PEDOT:PSS composite sensor when exposed to 100 ppm of NH(3) and - 29.8% sensitivity for an MWCNT-PANI composite sensor to 100 ppm of NO(2) when DMSO was used as a solvent. Additionally, the sensors exhibited good reversibility.
基于多壁碳纳米管（MWCNT）-聚合物复合材料的混合传感器已被制备，并集成到电阻式传感器设计中，用于气体传感应用。MWCNT 的薄膜通过二甲苯热解使用化学气相沉积技术在 Si/SiO2 衬底上生长。PEDOT：PSS 和聚苯胺（PANI）等聚合物与 DMSO、DMF、2-丙醇和乙二醇等各种溶剂混合，用于合成复合薄膜。当这些传感器暴露于低浓度（100ppm）的分析物气体（如 NH3 和 NO2）时，它们在室温下表现出出色的响应和选择性。广泛研究了各种溶剂对赋予 CNT-聚合物纳米复合材料选择性的传感器响应的影响。当使用 DMSO 作为溶剂时，暴露于 100ppm 的 NH3 时，MWCNT-PEDOT：PSS 复合传感器的灵敏度高达 28%，而暴露于 100ppm 的 NO2 时，MWCNT-PANI 复合传感器的灵敏度为-29.8%。此外，这些传感器还表现出良好的可逆性。
