Platinum Metals Rev., 1997, 41, (2), 80
Monodispersed Nanostructured Ultrafine Platinum
Nanostructured metal particles with interesting properties due to their quantum size effects, and with uses as advanced materials, have mostly been studied as isolated particles; while platinum monolayers have been little examined because of the difficult preparation of monodispersed ultrafine platinum particles.
However, a method has now been developed to control the size of polymer-protected ultra-fine platinum particles (T. Teranishi, M. Hosoe and M. Miyake, Adv. Mater ., 1997, 9, (1), 65–67). Ultrafine platinum particles, of different diameters, protected by poly(N -vinyl-2-pyrrolidone) (PVP), were prepared by heating H2PtCl6 under reflux in aqueous alcohol with PVP, and varying the reaction conditions.
Higher alcohol concentrations gave smaller particles of narrower size distribution; particle size reduced as: methanol > ethanol > l-propanol. Thus nucleation rate is the principal factor in determining particle size and distribution. Electrophoresis produced monolayers dependant on platinum concentrations, voltages and times.
Industrial Platinum Metals Chemistry
Please note that the following change should be made in “Industrial Platinum Metals Chemistry Towards the Year 2000”, which appeared in Platinum Metals Rev ., 1997, 41, (1) 8–11.
On page 10, in Figure 4, the molecule involved in the palladium-catalysed Heck reaction should have been dihydrofuran and not furan.