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Influence of different amount of Au on the wetting behavior of PDMS membrane

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Abstract

Polydimethylsiloxane (PDMS) has been widely used as a base material for bio-MEMS/NEMS devices. It is difficult for PDMS to transfer and spread aqueous solution as a kind of highly hydrophobic material. Therefore, surface modification is necessary for PDMS to make it hydrophilic. In this paper, a method of hydrophilization of PDMS surface is proposed. Gold is sputtered to the PDMS substrate by sputter coater in different average thicknesses. Relationship between the average thickness of gold on the PDMS substrate and the contact angle of the surface was studied. It was found that even gold of average thickness less than 1 nm can result in about 25° change of contact angle. AFM is also used to get topographic information of PDMS surface coated with gold. Three cases are classified with different amount of Au: (1) Heterogeneous zone; (2) Transition zone; (3) Film zone. For heterogeneous zone, a simple model about heterogeneous phase wetting is put forward to interpret this phenomenon.

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Acknowledgments

This work was supported by the National Basic Research Program of China (973 Program, Grant No. 2007CB310504), National Natural Science Foundation of China (NSFC, Grant No. 10225209), key project from Chinese Academy of Sciences (Grant No. KJCX-SW-L2). The AFM experimental assistance from Dr. Hui-Ling Li is appreciated. The valuable comments by anonymous referees are gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, 15 Beisihuanxi Road, Beijing, 100080, China

    Jiang-Tao Feng & Ya-Pu Zhao

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  1. Jiang-Tao Feng
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  2. Ya-Pu Zhao
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Correspondence to Ya-Pu Zhao.

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Feng, JT., Zhao, YP. Influence of different amount of Au on the wetting behavior of PDMS membrane. Biomed Microdevices 10, 65–72 (2008). https://doi.org/10.1007/s10544-007-9110-2

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