Curr. Appl. Phys. 2025; 70: 11-20
Published online February 28, 2025 https://doi.org/10.1016/j.cap.2024.11.007
Copyright © The Korean Physical Society.
Suleiman H.O.; Jung E.Y.; Jang H.; Kim J.Y.; Tae H.-S.
School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University, Daegu, 41566, South Korea; The Institute of Electronic Technology, College of IT Engineering, Kyungpook National University, Daegu, 41566, South Korea
Despite advancements in research on conducting polymers, obtaining stable conductivity in thin films remains challenging. Although ex-situ iodine (I2) doping methods have exhibited promise, they often result in unstable conductivity with increasing exposure time. This study aimed to produce polythiophene (PTh) nanostructure films with stable electrical conductivity through optimized ex-situ I2-doping techniques using a newly fabricated atmospheric pressure plasma reactor for PTh deposition. I2 charge carriers in the form of solid and liquid were separately incorporated into the PTh at room temperatures and 60 °C. FE-SEM, EDS, and FT-IR revealed an enhanced molecular structure, the distribution of element and functional chemical composition of the doped PTh nanostructure films, respectively. Compared to solid I2 doping, the liquid-doped PTh exhibited improved electrical conductivity and stable conductivity over a long period. The results also proved promising for reliable applications in electronic devices, making ex-situ liquid I2 doping a good technique. © 2024 Korean Physical Society
Keywords: Atmospheric pressure plasma, Conducting polymer, Ex-situ I2 doping, Plasma polymerization, Polythiophene nanostructure film
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