Switchable wettability of vertical Si nanowire array surface by simple contact-printing of siloxane oligomers and chemical washing

Sung-Soo Yoon; Dahl-Young Khang

doi:10.1039/C2JM30619K

Switchable wettability of vertical Si nanowire array surface by simple contact-printing of siloxane oligomers and chemical washing

Sung-Soo Yoon^a and Dahl-Young Khang*^a

* Corresponding authors

^a Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seoul, Korea
E-mail: dykhang@yonsei.ac.kr
Fax: +82 2 312 5375
Tel: + 82 2 2123 5835

Abstract

The wettability of a vertical Si nanowire (SiNW) array surface, prepared by a metal-assisted chemical etching technique, has been systematically investigated. The simple contact printing of siloxane oligomers has converted a SiNW array surface from superhydrophilic to superhydrophobic. In addition to the contact-printing time of siloxane oligomers, the nanowire length and its aggregation or bundling state have been found to have a profound effect on the wettability. The superhydrophobic state of the SiNWs with printed siloxane oligomers has shown long-term stability, even after prolonged dipping in water. Furthermore, the wettability could be switched reversibly many times, i.e., from superhydrophilic to superhydrophobic or vice versa, by the simple contact printing of siloxane oligomers and chemical washing with sulfuric acid repeatedly. The demonstrated reversible switching of the SiNWs’ surface wettability may be very helpful in many applications.

Supplementary files

Publication details

The article was received on 01 Feb 2012, accepted on 29 Mar 2012 and first published on 18 Apr 2012

Article type: Paper

DOI: 10.1039/C2JM30619K

Citation: J. Mater. Chem., 2012,22, 10625-10630

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Switchable wettability of vertical Si nanowire array surface by simple contact-printing of siloxane oligomers and chemical washing

S. Yoon and D. Khang, J. Mater. Chem., 2012, 22, 10625
DOI: 10.1039/C2JM30619K
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Journal of Materials Chemistry

Switchable wettability of vertical Si nanowire array surface by simple contact-printing of siloxane oligomers and chemical washing

Abstract

Supplementary files

Publication details

Switchable wettability of vertical Si nanowire array surface by simple contact-printing of siloxane oligomers and chemical washing

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