In situ fabrication of conducting polymer composite film as a chemical resistive CO2 gas sensor

Chi Ju Chiang, Kang Ting Tsai, Yi Huan Lee, Hung Wei Lin, Yi Lung Yang, Chien Chung Shih, Chia Yu Lin, Huai An Jeng, Yu Hsuan Weng, Yao Yi Cheng, Kuo Chuan Ho, Chi An Dai

研究成果: Article同行評審

57 引文 斯高帕斯(Scopus)


In this study, an easy to fabricate and low-cost, resistive-type CO2 gas sensor made of poly(3,4-ethylenedioxythiophene) (PEDOT) and branched polyethylenimine (BPEI) layers was fabricated on an interdigitated electrode. The PEDOT film was made by in situ polymerization and the BPEI layer was subsequently drop-coated on top of the PEDOT film. Upon exposure to 1000 ppm CO2 at 95% relatively humidity (RH) of the BPEI-PEDOT composite sensor, the synergistic effect of BPEI on CO2 sensing was subsequently investigated. The sensors showed no response (i.e. % of conductivity increase) if the sensor film was only made of a PEDOT layer without any BPEI. However, the response increased significantly to a value of 3.25% upon the addition of a layer of BPEI. The sensors also showed no obvious decay in the sensing response during repeated usages, providing the reusability of the technique for CO2 detection. As for sensor's selectivity, the sensors showed higher response for CO2 than for O2. Originally, the sensor showed a long recovery time of nearly 1 h. However, the long recovery time can be significantly shortened to approximately 10 min by heating the sensors at higher temperature for CO2 desorption. Thus, this easy and inexpensive fabrication process demonstrated that the sensor might have characteristics sufficient for real-world CO2 detection.

頁(從 - 到)409-415
期刊Microelectronic Engineering
出版狀態Published - 2013

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 原子與分子物理與光學
  • 凝聚態物理學
  • 表面、塗料和薄膜
  • 電氣與電子工程


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