Direct Gold Plating Selectively on UV Modified Polymer Film Using Tiopronin-Gold

• Published in: Journal of the Electrochemical Society Vol. 162; no. 6; pp. D193 - D198
• Main Authors: Endo, Hitoshi, Tashiro, Katsuhiko, Ma, Hengyi, Mizuhashi, Shoei, Yamamoto, Taibo, Kimizuka, Ryoichi, Takai, Osamu, Honma, Hideo, Cordonier, Christopher E. J.
• Format: Journal Article
• Language: English
• Published: The Electrochemical Society 01.01.2015
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/2.0441506jes

An economic and low toxicity gold plating process for bio-compatible device fabrication was investigated. A tiopronin-gold complex altered by mercaptothiodiazole or mercaptotriazole derivatives gave a form of the complex that could be reduced autocatalytically to enable electroless gold plating. Catalytic ca. 5 nm gold particles were selectively grafted into cycloolefin polymer and polyethylenenaphthalate film surfaces by adsorption of tiopronin-gold complex from solution into 20-30 nm deep ultra-violet light modified surface layers followed by reduction with sodium borohydride. Exposure of the catalyst adsorbed surfaces to baths composed of tiopronin-gold complex, mercaptothiodiazole and ascorbic acid resulted in selective electroless plating on the modified surfaces. Observation of the interface cross-section by transmission electron microscopy revealed that the gold deposits were physically anchored to the substrate by nanometer scale octopus trap like structures.