Controlled Wetting on Electrodeposited Oxide Thin Films: From Hydrophilic to Superhydrophobic

Autor:	Hua-Zhong Yu, Dinah M. Soolaman, Yajuan Hao
Rok vydání:	2013
Předmět:	Materials science Oxide Nanotechnology Substrate (electronics) Surfaces Coatings and Films Electronic Optical and Magnetic Materials Contact angle chemistry.chemical_compound General Energy chemistry Microcontact printing Monolayer Cubic zirconia Wetting Physical and Theoretical Chemistry Thin film
Zdroj:	The Journal of Physical Chemistry C. 117:7736-7743
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp401559y
Popis:	We have explored how surface morphology and structure affect wetting properties of electrodeposited oxide thin films notwithstanding chemical modifications. Microstripes of self-assembled monolayers (SAMs) on gold were prepared using a microcontact printing (μCP) technique, which served as molecular templates to guide the electrochemical deposition of zirconia in aqueous solution. The wetting properties of the thus-prepared zirconia oxide thin films are shown to be tunable; i.e., a wide range of wettabilities from hydrophilic to superhydrophobic can be obtained by simply varying the SAM template and the electrodeposition conditions (potential scan rate and number of cycles). In particular, a “two-tier” micro/nanoscale roughness was achieved on the gold substrate patterned with alternating stripes of 1-octadecanethiol and 6-mercapto-1-hexanol SAMs, which leads to a superhydrophobic surface (water contact angle ∼150°). Of great significance is the demonstrated ability herein to convert an intrinsically hydr...
Databáze:	OpenAIRE
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