Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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In situ Monitoring of Vapor-phase Polymerization and Characterization of Poly(3,4-ethylenedioxythiophene) Thin Films

Yasuko Koshiba, Mana Hirai, Shohei Horike, Masahiro Morimoto, Masahiro Misaki, Tastuya Fukushima, and Kenji Ishida

(Received May 10, 2018; Accepted August 10, 2018)

Keywords: vapor-phase polymerization, in situ UV-Vis, thermoelectric conversion

Thin films of poly(3,4-ethylenedioxythiophene) (PEDOT) were fabricated via vapor-phase polymerization (VPP) of the monomer 3,4-ethylenedioxythiophene (EDOT) with FeCl3·6H2O as the oxidant. The doping level and electrical properties of the VPP-PEDOT films were investigated by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and electrical conductivity measurements. The VPP of EDOT was observed by in situ ultraviolet-visible (UV-Vis) absorption spectroscopy. The results showed that highly doped PEDOT films were formed in the initial stages of VPP, and the doping level increased as the reaction proceeded. The doping level eventually decreased because of the limited amount of oxidant. Therefore, it was concluded that the doping level of VPP-PEDOT thin films could be changed depending on the initial amount and supply of oxidant. The thermoelectric properties of the as-synthesized VPP-PEDOT films were also studied, with the aim of application as an energy harvester and/or a temperature sensors.

Corresponding author: Kenji Ishida




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