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DOE OSTI · 2469500

A negative piezo-conductive effect from doped semiconducting polymer thin films

Yi, Chao·Shen, Lening·Zheng, Jie·Gong, Xiong
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Abstract

In the past years, piezo-conductive sensors have drawn great attention in both academic and industrial sectors. The piezo-conductive sensors made by inorganic semiconductors exhibited poor mechanical flexibility, restricting their further practical applications. In this study, we report the piezo-conductive sensors by a semiconducting polymer, poly(3,4-ethylenedioxythiophene) doped with tosylate ions (PEDOT:Tos) thin films. Systemically studies indicate that the piezo-conductive response of the PEDOT:Tos thin films is originated from the deformation of the PEDOT crystal cells and the stretched π–π distances induced by Tos. Moreover, the negative piezo-conductive effect, for the first time, is observed from PEDOT:Tos thin film under the pressure. A working mechanism is further proposed to interpret the transient from a positive to a negative piezo-conductive response within the PEDOT:Tos thin films. Our studies offer a facile route to approach effective piezo-conductive sensors based on conjugated polymers.

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36 MATERIALS SCIENCE

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Yi, Chao, Shen, Lening, Zheng, Jie, Gong, Xiong. 2021-09-14. A negative piezo-conductive effect from doped semiconducting polymer thin films. https://doi.org/10.1038/s41598-021-97812-4

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36 MATERIALS SCIENCE↗