Formation of monodispersed ultrafine platinum particles and their electrophoretic deposition on electrodes

Ordered ultrafine platinum particles are expected to have properties differing from those of isolated particles, however, few measurements have been made because of the difficulty of producing monodispersed Pt particles. A method is reported for controlling the size and size distribution of polymer‐protected ultrafine Pt particles, which can be ordered densely in two dimensions to give Pt particle monolayers by electrophoretic deposition. The structure of the particles and the importance of the nucleation rate in determining the size and distribution are discussed.