Preparation of Hydrophilic Poly(dimethylsiloxane) Stamps by Plasma-Induced Grafting
- 19 July 2003
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 19 (17), 6982-6986
- https://doi.org/10.1021/la020785h
Abstract
We report a method to prepare hydrophilic poly(dimethylsiloxane) (PDMS) stamps that could transfer patterns of polar molecules homogeneously in soft lithography. In this method, we demonstrated a two-step procedure by using a mixed gas of argon (Ar) and hydrogen (H2)-based microwave plasma pretreatment to activate PDMS and subsequent acrylonitrile grafting onto PDMS, generating a hydrophilic surface with cyano (−CN) group coatings. The PDMS hydrophilic surface exhibited high affinity for wetting acetonitrile, which is a conventional solvent for DNA synthesis. Acetonitrile droplets possessed contact angles as low as 17 ± 7° on the cyano (−CN) groups grafted PDMS stamps surface. The hydrophilicity was stable and could last for at least 1 month at room temperature. Attenuated total reflectance Fourier transform infrared spectroscopy and X-ray photoelectron spectrum were used to characterize the surface hydrophilization. Such a hydrophilic and inert PDMS stamp showed significance for reactive multilevel fabrications in soft lithography. The possible chemical mechanism for PDMS surface grafting was discussed.Keywords
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