title: Thermal/plasma-driven reversible wettability switching of a bare gold film on a poly(dimethylsiloxane) surface by electroless plating.
abstract: We report an approach for fabricating a tunable wettability surface by electroless gold plating on poly(dimethylsiloxane) (PDMS). A two-layer structured gold film with a tight layer and a loose layer can be obtained on the surface of a PDMS chip when the PDMS chip is immersed in a gold plating solution at 30 degrees C for 4 h. Its wettability can be rapidly switched between superhydrophilicity and superhydrophobicity by plasma and heat treatments without any self-assembled monolayer, and the superhydrophobicity can be even changed from the gecko-foot-hair-like character to the lotus-leaf-like character. Benefiting from the various wettabilities of the prepared gold/PDMS composites, protein patterning is successfully achieved on a patterned superhydrophobic/superhydrophilic gold/PDMS composite; a superhydrophobic needle for transferring supersmall water droplets (1 microL) to a superhydrophobic surface is successfully fabricated.
authors.affiliation: The Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Hai-Jing
authors.initials: HJ
authors.lastname: Bai
authors.forename: Xian-Bo
authors.initials: XB
authors.lastname: Zhang
authors.forename: Jing-Juan
authors.initials: JJ
authors.lastname: Xu
authors.forename: Hong-Yuan
authors.initials: HY
authors.lastname: Chen
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D013058:Mass Spectrometry; D056951:Photoelectron Spectroscopy; D013696:Temperature; D013818:Thermogravimetry; D017155:Wettability
chemical_list: D004129:Dimethylpolysiloxanes; D006046:Gold