High performance NH3 gas sensor based on ordered conducting polymer ultrathin film

Jianhua Xu; Yadong Jiang; Junsheng Yu; Yajie Yang; Zhihua Ying

doi:10.1117/12.792245

11 March 2008 High performance NH₃ gas sensor based on ordered conducting polymer ultrathin film

Jianhua Xu, Yadong Jiang, Junsheng Yu, Yajie Yang, Zhihua Ying

Proceedings Volume 6984, Sixth International Conference on Thin Film Physics and Applications; 69843R (2008) https://doi.org/10.1117/12.792245
Event: Sixth International Conference on Thin Film Physics and Applications, 2007, Shanghai, China

Abstract

Conducting polymer ultrathin film shows promising future for gas sensor application due to their high conductivity and excellent doping/dedoping performance. In this work, based on an modified Langmuir-Blodgett film method, ultrathin conducting poly(3,4-ethylene dioxythiophene) (PEDOT) film was fabricated. The PEDOT ultathin film was characterized by UV-Vis absorption spectrum, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) techniques. The results showed small PEDOT grains distributed in polymer LB films after the polymerization of monomer. This ultrathin film exhibited an electrical conductivity about 1.2 Scm^-1, and the conductivity increased and decreased to 16.8 and 0.03 Scm^-1 after doping and dedoping treatment. The interaction or response of films coated QCM to NH₃ have been tested and it has been found that sensitivity of the composite films on QCM showed better sensitivity than bulk material. To the same analyte concentration, it increased with the increasing number of LB layers coated onto QCMS before 80 layers, and then a decrease of sensitivity of QCM was observed after the layer number exceeded 80 layers. The interaction mechanisms between the ultrathin film and analyte vapor were also included.

Citation Download Citation

Jianhua Xu, Yadong Jiang, Junsheng Yu, Yajie Yang, and Zhihua Ying "High performance NH₃ gas sensor based on ordered conducting polymer ultrathin film", Proc. SPIE 6984, Sixth International Conference on Thin Film Physics and Applications, 69843R (11 March 2008); https://doi.org/10.1117/12.792245

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