Effect of distance from discharge to substrate on plasma-polymerized polythiophenes

Plasma-polymerized polythiophenes were deposited as thin films utilizing plasma of mid-range frequency (40kHz) and low power (4W). The thin films were prepared by changing the distance from the top electrode to the substrates, and the resulting films were compared. Conductivity increased with distan...

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Bibliographic Details
Published in:Surface & coatings technology 2014-11, Vol.259, p.27-32
Main Authors: Jeong, Dong-Cheol, Wen, Long, Kim, Sanghoon, Nam, Jae-Do, Han, Jeon Geon, Song, Changsik
Format: Article
Language:English
Subjects:
Coatings
Conducting polymer
Conductivity
Cross-disciplinary physics: materials science
rheology
Deposition
Discharge
Electrodes
Exact sciences and technology
Materials science
Nucleation
Physics
Plasma polymerization
Polythiophene
Surface roughness
Surface treatments
Thin films
X-ray photoelectron spectroscopy
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Summary:Plasma-polymerized polythiophenes were deposited as thin films utilizing plasma of mid-range frequency (40kHz) and low power (4W). The thin films were prepared by changing the distance from the top electrode to the substrates, and the resulting films were compared. Conductivity increased with distance up to 110mm, and then decreased with further increase in distance. FT-IR and XPS analysis showed that the thin films had similar molecular structures regardless of the distance. However, as the distance increased, surface roughness increased from 0.54 to 5.53nm, which suggested gas-phase nucleation and molecular packing. •We prepared conducting polymers with a mid-frequency plasma at various distances.•We found that the film's conductivity increased with distance up to 110mm.•Conductivity increase appears due to better chain–chain packing induced by gas-phase nucleation and growth.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2014.07.057