Research Article

Nano Research

, Volume 2, Issue 2, pp 143-150

Open Access This content is freely available online to anyone, anywhere at any time.

Superhydrophobic surfaces produced by applying a self-assembled monolayer to silicon micro/nano-textured surfaces

  • Yong SongAffiliated withDepartment of Mechanical Engineering, University of Arkansas
  • , Rahul Premachandran NairAffiliated withDepartment of Mechanical Engineering, University of Arkansas
  • , Min ZouAffiliated withDepartment of Mechanical Engineering, University of Arkansas Email author 
  • , Yongqiang WangAffiliated withOcean NanoTech, LLC.

Abstract

A novel way of producing superhydrophobic surfaces by applying a self-assembled monolayer (SAM) to silicon micro/nano-textured surfaces is presented in this paper. The micro/nano-textured surfaces on silicon substrates were generated by the aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) technique. Octadecyltrichlorosilane (OTS) SAMs were then applied to the textured surfaces by dip coating. The topography and wetting properties of the resulting surfaces were characterized using scanning electron microscopy (SEM) and a video-based contact angle measurement system. The results show that by introducing OTS SAMs on the silicon micro/nano-textured surfaces, superhydrophobic surfaces with water contact angles (WCAs) of 155° were obtained, as compared to the WCAs of OTS-modified smooth silicon surfaces of about 112°. Surface topography was found to directly influence the WCA as predicted by the Cassie-Baxter model.

http://static-content.springer.com/image/art%3A10.1007%2Fs12274-009-9012-0/MediaObjects/12274_2009_9012_Fig1_HTML.jpg

Keywords

Superhydrophobic wetting property micro/nano-textured surfaces octadecyltrichlorosilane self-assembled monolayer aluminum-induced crystallization of amorphous silicon