PEG/碳纳米管复合材料的制备与气敏响应研究

A highly selective chemical gas sensor based on functionalization of multi-walled carbon nanotubes with poly(ethylene glycol)

采用聚乙二醇对带有羧基的多壁碳纳米管(MWN-COOH)进行表面化学功能修饰,制备了一种新颖的对氯仿蒸气具有择优选择性化学气敏传感器,通过热重分析、红外光谱、拉曼光谱对薄膜样品进行表征,研究了薄膜样品对各种有机溶剂蒸气的电阻响应行为。实验结果表明该传感器对氯仿蒸气具有高的响应强度,快的响应速度和良好的重复稳定性,这归功于聚乙二醇接枝碳纳米管(MWNT-g-PEG)形成的独特结构和物理化学性能。

A novel highly-selcctive gas sensor was fabricated by a chemical modification on multi-wall carbon nano- tubes containing carboxylic groups （MWN-COOH） with PEG. The graft percentage and vibration spectra were characterized by TGA,FTIR and Raman pectrometer, and the resistance responsiveness of the samples against various organic vapors was investigated. Experement showed that the film displayed high chemical selectivity, fast response and good reproducibility or long stability to chloroform vapor, which were attributed to the peculiar structure and physical-chemical properties of MWNTs grafted PEG polymers（MWNT-g-PEG）.