Abstract
Poly(vinyl pyrrolidone)-capped multiple twinned gold (Au) particles withdecahedral shape have been synthesized by a simple and convenient solvothermalwet chemical method. In the process, hydrogen tetrachloroauric acid(HAuCl4·3H2O) was reduced by ethylene glycol (EG) to form the multiple twinned Aunanocrystals in the presence of poly(vinyl pyrrolidone) (PVP) molecules at200 °C under the extra condition of autogenous pressure. The decahedral nanoparticlestake up about 10% of the total amount and have the usual size distribution fromseveral tens to hundreds of nanometres. Some larger microsized five-twinned Auparticles with perfect decahedral shape have also been observed in the final product.Furthermore, x-ray photoelectron spectroscopy (XPS) measurements verified thatPVP molecules are adsorbed on the surface of the Au particles. Based on theexperimental results, a growth mechanism has been suggested to elucidate theformation of the small decahedral Au nanoparticles as well as their evolutioninto perfect large decahedral Au particles with the size of several micrometres.
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