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Conductive Polymer Synthesis with Single-Crystallinity via a Novel Plasma Polymerization Technique for Gas Sensor Applications

1
School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 702-701, Korea
2
Department of Electronics Engineering, Sejong University, Seoul 143-747, Korea
3
Nano Convergence Devices Research Department, Electronics and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Der-Jang Liaw
Materials 2016, 9(10), 812; https://doi.org/10.3390/ma9100812
Received: 7 July 2016 / Revised: 13 September 2016 / Accepted: 26 September 2016 / Published: 30 September 2016
(This article belongs to the Section Manufacturing Processes and Systems)
This study proposes a new nanostructured conductive polymer synthesis method that can grow the single-crystalline high-density plasma-polymerized nanoparticle structures by enhancing the sufficient nucleation and fragmentation of the pyrrole monomer using a novel atmospheric pressure plasma jet (APPJ) technique. Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (FE-SEM) results show that the plasma-polymerized pyrrole (pPPy) nanoparticles have a fast deposition rate of 0.93 µm·min−1 under a room-temperature process and have single-crystalline characteristics with porous properties. In addition, the single-crystalline high-density pPPy nanoparticle structures were successfully synthesized on the glass, plastic, and interdigitated gas sensor electrode substrates using a novel plasma polymerization technique at room temperature. To check the suitability of the active layer for the fabrication of electrochemical toxic gas sensors, the resistance variations of the pPPy nanoparticles grown on the interdigitated gas sensor electrodes were examined by doping with iodine. As a result, the proposed APPJ device could obtain the high-density and ultra-fast single-crystalline pPPy thin films for various gas sensor applications. This work will contribute to the design of highly sensitive gas sensors adopting the novel plasma-polymerized conductive polymer as new active layer. View Full-Text
Keywords: atmospheric pressure plasma; plasma-polymerized pyrrole; single-crystalline; gas sensor; iodine doping atmospheric pressure plasma; plasma-polymerized pyrrole; single-crystalline; gas sensor; iodine doping
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MDPI and ACS Style

Park, C.-S.; Kim, D.H.; Shin, B.J.; Kim, D.Y.; Lee, H.-K.; Tae, H.-S. Conductive Polymer Synthesis with Single-Crystallinity via a Novel Plasma Polymerization Technique for Gas Sensor Applications. Materials 2016, 9, 812.

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