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We report on the fabrication of gas sensors on different polymer substrates to evaluate the substrate material influence on the gas sensor performance. For this purpose, we developed a resistive type gas sensor out of a conductive polymer composite material on flexible polymer substrates (PI, PEN, PPS and PEI). We compared the sensors on polymer substrates to a similar one on a glass substrate as ground truth. The exposure to increasing levels of humidity showed an effect on the gas sensing behavior on plastic substrates. At a jump from 0 %RH to 60 %RH, PEI substrates showed the lowest substrate influence with resistance changes of about 0.2%. At the same conditions PEN and PPS substrates showed substrate influences with resistance changes of about 1 %. An exposure to 1000 ppm acetone in dry air showed a similar performance among all substrates.

6.2.4 Influence of Flexible Substrate Materials on the Performance of Polymer Composite Gas Sensors