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@article{1875451,
author = {Mishra, Himanshu and Bolouki, Nima and Hsieh, Stephen T. and Li, Chuan and Wu, Weite and Hsieh, JangandHsing},
article_number = {6},
doi = {http://dx.doi.org/10.3390/coatings12060865},
keywords = {inner surface coating; optical emission spectroscopy; plasma polymerization; sheath thickness; plasma},
language = {eng},
issn = {2079-6412},
journal = {Coatings},
title = {Application of Spectroscopic Analysis for Plasma Polymerization Deposition onto the Inner Surfaces of Silicone Tubes},
url = {https://www.mdpi.com/2079-6412/12/6/865},
volume = {12},
year = {2022}
}
TY - JOUR
ID - 1875451
AU - Mishra, Himanshu - Bolouki, Nima - Hsieh, Stephen T. - Li, Chuan - Wu, Weite - Hsieh, Jang-Hsing
PY - 2022
TI - Application of Spectroscopic Analysis for Plasma Polymerization Deposition onto the Inner Surfaces of Silicone Tubes
JF - Coatings
VL - 12
IS - 6
SP - 1-13
EP - 1-13
PB - MDPI
SN - 20796412
KW - inner surface coating
KW - optical emission spectroscopy
KW - plasma polymerization
KW - sheath thickness
KW - plasma
UR - https://www.mdpi.com/2079-6412/12/6/865
N2 - In the current study, plasma-polymerized methyl methacrylate (PP-MMA) generation on the inner surface of a silicone tube was performed in a capacitively coupled discharge reactor. The possibility of generating plasma inside the tube was analyzed and calculated by using optical emission spectroscopy (OES). A hollow cathode model was first proposed to determine whether plasma discharge would be generated inside the tube in the low-pressure regime. Since the ignition of plasma inside the tube is necessary for the initiation of polymerization processes, the sheath thickness was calculated analytically. To achieve the goal, the electron temperature and density of plasma should be determined beforehand. In this study, the electron temperature and plasma density were measured and calculated according to OES spectra using both the modified Boltzmann plot and the line-ratio method. The results reveal that the occurrence of plasma inside the tube can be achieved if the tube's inner diameter is greater than two times the thickness of the sheath. The effect of methyl methacrylate (MMA) monomer concentration on sheath thickness, and, hence, plasma generation and deposition, was investigated in the presence of argon plasma and MMA monomer. According to the study, one could control the ignition of plasma discharges inside the tube followed by plasma polymerization deposition. The OES method was also applied to identify the presence of the excited species related to the fragmented monomer. The deposition of PP-MMA films on the inner surface of the tube was confirmed via attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy.
ER -
MISHRA, Himanshu, Nima BOLOUKI, Stephen T. HSIEH, Chuan LI, Weite WU and Jang-Hsing HSIEH. Application of Spectroscopic Analysis for Plasma Polymerization Deposition onto the Inner Surfaces of Silicone Tubes. \textit{Coatings}. MDPI, 2022, vol.~12, No~6, p.~1-13. ISSN~2079-6412. Available from: https://dx.doi.org/10.3390/coatings12060865.
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