Synthesis of Silver and Gold Nanoparticles by a Novel Electrochemical Method (pages 68–75)
Houyi Ma, Bingsheng Yin, Shuyun Wang, Yongli Jiao, Wei Pan, Shaoxin Huang, Shenhao Chen and Fanjun Meng
Version of Record online: 19 JAN 2004 | DOI: 10.1002/cphc.200300900
Plastic support for noble clusters: Poly(N-vinylpyrrolidone) (PVP) has a structure consisting of a polyvinyl skeleton with pendant polar pyrrolidone groups. Silver ions can anchor to the backbone of PVP by coordinating with the oxygen (or nitrogen) atoms of the lactim rings. During electrolysis, the Ag–PVP complex ions are reduced at the cathode surface, forming silver adatoms protected by the hydrophobic polyvinyl chains, which will form silver clusters shortly afterwards. The use of a rotating platinum cathode significantly accelerates the transfer rate of the silver clusters from the cathode vicinity to the bulk solution (see picture), thereby producing well-dispersed silver nanoparticles.