Characterization of Gold-Formaldehyde Baths for Electrochemical Deposition

摘要

Cyanide-based gold baths have been widely used for gold plating; however they are recently avoided due to their toxicity. Non-cyanide baths have been developed to overcome those problems, most of them based on Au(I)-sulfide complex, but they are usually unstable. A stable Au(I)-sulfide containing formaldehyde was developed and its behavior has been investigated. The possible electrochemical reactions were analyzed with the aid of Cyclic Voltammetry (CV). In addition, Rutherford Backscattering Spectrometry (RBS) was used to obtain the deposits composition and thickness.