Controlled growth of silver nanoparticles in a hydrothermal process
Juan Zoua,b,Yao Xuc,,Bo Houc,Dong Wuc,Yuhan Sunca State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China b Graduate School of the Chinese Academy of Sciences,Beijing 100049,Chian c CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Tayyuan 030001,China
A two-step synthesis was used to control the shape of silver nanoparticles. First, a few spherical silver nanoparticles, ～10nm in size, were prepared via reduction of Ag+ ions in aqueous Ag(NH3)2NO3 by poly(N-vinyl-2-pyrrolidone) (PVP). Then, in a subsequent hydrothermal treatment, the remaining Ag+ ions were reduced by PVP into polyhedral nanoparticles, or larger spherical nanoparticles formed from the small spherical seed silver nanoparticles in the first step. The morphology and size of the resultant particles depend on the hydrothermal temperature, PVP/Ag molar ratio and concentration of Ag+ ions. By using UV-visible spectroscopy (UV-vis), transmission electron microscopy (TEM) and powder X-ray diffraction (XRD), the possible growth mechanism of the silver nanoparticles was discussed.
【CateGory Index】： O614.122