A low power 50Hz argon plasma for surface modification of polytetrafluoroethylene  

作　　者：Yen Theng LAU Wee Siong CHIU Hong Chun LEE Haw Jiunn WOO Oi Hoong CHIN Teck Yong TOU 刘恩婷;赵伟祥;李鸿俊;胡浩俊;陈爱虹;杜德扬(Department of Physics,Faculty of Science,University of Malaya,Kuala Lumpur 50603,Malaysia;Faculty of Engineering,Multimedia University,Persiaran Cyberjaya,Cyberjaya 63100,Malaysia)

机构地区：[1]Department of Physics,Faculty of Science,University of Malaya,Kuala Lumpur 50603,Malaysia [2]Faculty of Engineering,Multimedia University,Persiaran Cyberjaya,Cyberjaya 63100,Malaysia

出　　处：《Plasma Science and Technology》2022年第11期1-13,共13页等离子体科学和技术（英文版）

基　　金：supported by the University of Malaya Postgraduate Research(PPP)(No.PG062-2016A);RU Grant-Faculty Program(No.GPF042B-2018).

摘　　要：The characteristics of a low power 50 Hz argon plasma for surface treatment of polytetrafluoroethylene(PTFE)film is presented in this article.The current–voltage behavior of the discharge and time-varying intensity of the discharge showed that a DC glow discharge was generated in reversed polarity at every half-cycle.At discharge power between 0.5 and 1 W,the measured electron temperature and density were 2–3 eV and∼10^(8) cm^(−3),respectively.The optical emission spectrum of the argon plasma showed presence of some‘impurity species’such as OH,N_(2) and H,which presumably originated from the residual air in the discharge chamber.On exposure of PTFE films to the argon glow plasma at pressure 120 Pa and discharge power 0.5 to 1 W,the water contact angle reduced by 4%to 20%from the original 114°at pristine condition,which confirms improvement of its surface wettability.The increase in wettability was attributed to incorporation of oxygen-containing functional groups on the treated surface and concomitant reduction in fluorine as revealed by the XPS analysis and increase in surface roughness analyzed from the atomic force micrographs.Ageing upon storage in ambient air showed retention of the induced increase in surface wettability.

关 键 词：50 Hz glow discharge plasma surface treatment PTFE hydrophobic recovery ageing effect 

分 类 号：O53[理学—等离子体物理] O461.21[理学—物理]