Transition from positive to negative electrical resistance response under humidity conditions for PEDOT:PSS-MoS2 nanocomposite thin films

  • Dominique Mombrú
  • Mariano RomeroEmail author
  • Ricardo FaccioEmail author
  • Alvaro W. MombrúEmail author


Here, we report the preparation of PEDOT:PSS-MoS2 nanocomposite thin films and their electrical resistance response under humidity conditions revealing their promising properties as humidity sensor materials. One of the most interesting features of our samples is the transition from positive to a negative electrical resistance response to humidity conditions with increasing MoS2 additions. Our confocal Raman imaging studies revealed that the presence of MoS2 yields a local charge rearrangement in the thiophenyl rings of PEDOT:PSS, in relation to the enhancement of the electrical resistance negative response as observed by impedance spectroscopy analysis. The enhancement on the negative response with increasing MoS2 additions could be explained through the increment of hole carriers in MoS2 nanosheets under humidity conditions, thus leading to an enhancement in the electrical transport along the PEDOT:PSS chains.



The authors wish to thank the Uruguayan ANII, CSIC and PEDECIBA funding institutions. We also want to thank the technical support of Alvaro Olivera and the collaboration of Laura Fornaro at GDMEA-CURE high-resolution transmission electron microscopy laboratory.

Supplementary material

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Supplementary material 1 (DOCX 400 KB)


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Centro NanoMat, Cryssmat-Lab, DETEMA, Facultad de QuímicaUniversidad de la RepúblicaMontevideoUruguay

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