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Surface Modification of Silicone Rubber by CF4 Radio Frequency Plasma Immersion

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Abstract

Silicone rubber samples were treated by CF4 capacitively coupled plasma at radio frequency (RF) power of 60, 100 and 200 W for a treatment time up to 20 min under CF4 flow rate of 20 sccm, respectively. Static contact angle, ATR-FTIR and XPS, and AFM were employed to characterize the changes of surface on hydrophobicity, functional groups, and topography. The results indicate the static contact angle is improved from 100.7 to 150.2°, and the super-hydrophobic surface, which corresponds to a static contact angle of 150.2°, appears at RF power of 200 W for a 5 min treatment time. It is suggested that the formation of super-hydrophobic surface is ascribed to the co-action of the increase of surface roughness created by the ablation reaction of CF4 plasma and the formation of [–SiF x (CH3)2−x –O–] n (x = 1, 2) structure produced by the direct attachment of F atoms to Si.

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Acknowledgments

We acknowledge contributory discussions and technical assistant of X. P. Zhu, X. G. Han, C. Liu, H. Wang, P. Li.

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Authors and Affiliations

  1. School of Physics Science and Technology, Central South University, Changsha, 410083, China

    Song-Hua Gao, Ke-Sheng Zhou & Li-Shi Wen

  2. Surface Engineering Laboratory, School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China

    Song-Hua Gao, Ming-Kai Lei & Li-Shi Wen

  3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Li-Shi Wen

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  1. Song-Hua Gao
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  2. Ke-Sheng Zhou
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Correspondence to Song-Hua Gao.

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Gao, SH., Zhou, KS., Lei, MK. et al. Surface Modification of Silicone Rubber by CF4 Radio Frequency Plasma Immersion. Plasma Chem Plasma Process 28, 715–728 (2008). https://doi.org/10.1007/s11090-008-9156-9

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  • DOI: https://doi.org/10.1007/s11090-008-9156-9

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