In-situ self-assembled polyaniline/carbon nanotubes nanofiber thin films for ammonia gas sensors

Huiling Tai; Yadong Jiang; Guangzhong Xie

doi:10.1117/12.866967

3 November 2010 In-situ self-assembled polyaniline/carbon nanotubes nanofiber thin films for ammonia gas sensors

Huiling Tai, Yadong Jiang, Guangzhong Xie

Proceedings Volume 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology; 76582T (2010) https://doi.org/10.1117/12.866967
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Polyaniline/carbon nanotubes (PANI/CNTs) nanocomposite thin films were fabricated through an in-situ self-assembled method on the interdigitated electrodes for ammonia (NH₃) gas sensors. CNTs presented in this work consisted of singlewalled CNTs (SWNT) and multi-walled CNTs (MWNT). The pure MWNT dispersed in N,N-Dimethyl Formamide (DMF) solution was also dipped on the interdigitated electrodes for gas-sensing property comparison. The SEM images showed clearly that PANI/CNTs nanocomposite thin films possess a nanofiber mesh like structure, and TEM analysis exhibited that the diameter of the pure MWNT was 10 nm whereas that of the PANI/MWNT nanofiber was about 50 nm, which confirmed a PANI layer packed on the surface of MWNT during the in-situ polymerization process. The gasresponse of different sensing films to NH3 was investigated at room temperature. It was found that PANI/MWNT nanocomposite thin film exhibited the higher sensitivity than pure MWNT film and PANI/SWNT thin film, which might be ascribed to more active sites for gas adsorption for the PANI/MWNT nanocomposite thin film. The response-recovery property was studied when the PANI/MWNT thin film sensor was exposed to different concentrations of NH₃ ranging from 23 to 141 ppm, and it was found that the sensitivity was linear to the concentrations of NH₃. This sensor also had good reproducibility and selectivity.

Citation Download Citation

Huiling Tai, Yadong Jiang, and Guangzhong Xie "In-situ self-assembled polyaniline/carbon nanotubes nanofiber thin films for ammonia gas sensors", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76582T (3 November 2010); https://doi.org/10.1117/12.866967

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