期刊
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
卷 25, 期 4, 页码 1093-1097出版社
A V S AMER INST PHYSICS
DOI: 10.1116/1.2712186
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资金
- Engineering and Physical Sciences Research Council [GR/S55026/01] Funding Source: researchfish
In this study, thin-film deposition in a pulsed rf polymerizing discharge (13.56 MHz) struck in acrylic acid has been investigated by mass spectrometry, x-ray photoelectron spectroscopy, and quartz crystal microbalance techniques. The experiment was conducted at a fixed acrylic acid pressure of 1.3 Pa and on pulse duration of 0.1 ms, whereas the off time was varied between 0 and 20 ms. The rf input power in the on time and gas flow rate were varied between 10 and 50 W and. 1.5 and 4.8 sccm (sccm denotes cubic centimeter per minute at STP), respectively. These changes of the discharge conditions resulted in large-scale progressive variations in film and gas-phase plasma composition. In particular, the -COOH functionality of the monomer was increasingly retained in the plasma-generated thin films as the duty cycle was lowered (i.e., with lowered time-averaged powers). The monomer retention reached its maximum value of 66% for off times exceeding 5 ms, when the discharge was operating in the power-deficient regime. The results show that the film deposition rate is a strong function of the monomer flow rate, whereas -COOH retention is correlated to the amount of unfragmented monomer in the plasma, controlled by the applied power. (c) 2007 American Vacuum Society.
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