Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014)
    Thin Films Tuesday Sessions
       Session TF-TuP

Paper TF-TuP6
Fabrication of Transparent Superhydrophobic Surface by Single, Multi-Step and Gas Mixture Method Using CH4/C4F8/He Atmospheric Pressure Plasma

Tuesday, December 9, 2014, 4:00 pm, Room Mauka

Session: Thin Films Poster Session
Presenter: Duksun Han, Chonbuk National University, Republic of Korea
Authors: D. Han, Chonbuk National University, Republic of Korea
S.Y. Moon, Chonbuk National University, Republic of Korea
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Superhydrophobic surface was prepared by CH4/C4F8/He atmospheric pressure plasma. Single step and multi-step processes using CH4 and C4F8 precursors are performed to investigate evolution of a transparency and wettability. In case of the single step process, a surface modification using C4F8 showed high water droplet contact angle (WCA) relative to the CH4 plasma treatment due to a difference of surface free energy. On the other hand, the contact angle was remarkably increased to 152o, indicating superhydrophobic property, using sequential multi-step CH4 and C4F8 plasma treatment. Also, a rapid single-step method using a He, CH4, and C4F8 mixture plasma was performed. In this case, WCA was gradually increased to 170 o and the transparency was decreased when the gas ratio of C4F8 to the total flow rate was increased. The chemical and physical mechanism responsible for hydrophobicity by atmospheric pressure plasma is discussed through the investigation of chemical composition and surface morphology using a FTIR, XPS, SEM and AFM.