Electrical conductivity and stability of oxidative chemical vapor deposition copolymer thin films of thiophene and pyrrole

Siamak Nejati, Arpit Patel, Gregory R. Wallowitch, Kenneth K.S. Lau

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

In a single step polymerization and coating, oxidative chemical vapor deposition (oCVD) is used to synthesize copolymers of thiophene and pyrrole. The copolymer composition is controlled simply by adjusting the ratio of the comonomers in the feed. The electrical conductivity of the copolymer is found to be higher than the homopolymer of either comonomer and is more stable in the ambient over the period of three months tested. The enhanced conductivity and stability are attributed to fewer defects and enhanced doping as evidenced by Raman and X-ray photoelectron spectroscopy. Grazing incident angle X-ray diffraction indicates there is no long range order or crystallinity to explain the enhanced electrical properties. Instead, the film synthesis approach and the resulting film chemical environment are believed to be the primary reasons behind the enhanced conductivity of the deposited copolymer films.

Original languageEnglish (US)
Pages (from-to)50-55
Number of pages6
JournalNanoscience and Nanotechnology Letters
Volume7
Issue number1
DOIs
StatePublished - Jan 1 2015

Keywords

  • Copolymer
  • Electrical conductivity
  • Oxidative chemical vapor deposition (oCVD)
  • Pyrrole
  • Thiophene

ASJC Scopus subject areas

  • Materials Science(all)

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