Characterization of free-standing PEDOT: PSS/iron oxide nanoparticle composite thin films and application as conformable humidity sensors

Silvia Taccola, Francesco Greco, Alessandra Zucca, Claudia Innocenti, César De Julián Fernández, Giulio Campo, Claudio Sangregorio, Barbara Mazzolai, Virgilio Mattoli

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

In this study, a new simple, fast, and inexpensive technique for the preparation of free-standing nanocomposite ultrathin films based on the conductive polymer poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and embedding iron oxide nanoparticles (NPs) is presented. These nanofilms were fabricated by a single step of spin-coated assisted deposition in conjunction with a release technique ("supporting layer technique") to detach them from the substrate. Free-standing nanofilms can be easily transferred onto several substrates due to their high conformability, preserving their functionalities. The effect of the addition of iron oxide nanoparticles on the structural and functional properties of the PEDOT:PSS nanofilms is investigated through topography, thickness, magnetic, magneto-optical activity, and conductivity characterizations. PEDOT:PSS and PEDOT:PSS/iron oxide NP nanofilms were tested as resistive humidity sensors. Their sensitivity to humidity was found to increase with increasing nanoparticle concentration. On the basis of these results, it is expected that these composites may furnish inexpensive and reliable means for relative humidity detection.

Original languageEnglish
Pages (from-to)6324-6332
Number of pages9
JournalACS Applied Materials and Interfaces
Volume5
Issue number13
DOIs
Publication statusPublished - 2013 Jul 10
Externally publishedYes

Keywords

  • humidity sensor
  • iron oxide
  • nanocomposite
  • PSS
  • thin film

ASJC Scopus subject areas

  • Materials Science(all)
  • Medicine(all)

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  • Cite this

    Taccola, S., Greco, F., Zucca, A., Innocenti, C., De Julián Fernández, C., Campo, G., Sangregorio, C., Mazzolai, B., & Mattoli, V. (2013). Characterization of free-standing PEDOT: PSS/iron oxide nanoparticle composite thin films and application as conformable humidity sensors. ACS Applied Materials and Interfaces, 5(13), 6324-6332. https://doi.org/10.1021/am4013775