Nitrogen plasma surface modification of poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate) films to enhance the piezoresistive pressure-sensing properties

Jer Chyi Wang*, Rajat Subhra Karmakar, Yu Jen Lu, Ming Chung Wu, Kuo Chen Wei

*此作品的通信作者

研究成果: 期刊稿件文章同行評審

16 引文 斯高帕斯(Scopus)

摘要

A conductive polymeric film, poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS), is surface-modified by nitrogen plasma in order to enhance its piezoresistive characteristics. With an optimized 3 min nitrogen plasma surface modification, the piezoresistive sensitivity and response were significantly enhanced. Hall measurements and temperature-dependent conductance measurements are carried out to determine the electron-hopping behavior of nitrogen-plasma-modified PEDOT:PSS films, suppressing the horizontal carrier conducting pathway in the PEDOT:PSS piezoresistive pressure sensors. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy are applied to observe the PEDOT:PSS film surface after being modified with nitrogen plasma. The presence of sulfamate (SO3-NH2) and thiocyanate (S-C?N) groups indicates a breaking of the electrostatic bonding between PEDOT and PSS and a modification of the conductive PEDOT conjugated chain. At the film surface, the formation of thiocyanate groups of PEDOT oligomers without the electrostatic bonding of PSS makes the PEDOT:PSS more hydrophobic, changing the surface characteristics of the PEDOT:PSS film. The newly formed less-conductive film surface alters the piezoresistance of PEDOT:PSS pressure sensors, implying their potential applications for future high-performance tactile sensing.

原文英語
頁(從 - 到)25977-25984
頁數8
期刊Journal of Physical Chemistry C
120
發行號45
DOIs
出版狀態已出版 - 17 11 2016

文獻附註

Publisher Copyright:
© 2016 American Chemical Society.

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