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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(NH 3 ) 2 NO 3 by poly(N-vinyl-2-pyrrolidone) (PVP). Then, in a subsequent hydrothermal treatment, the remaining Ag + ions were reduced by PVP into polyhedral nanoparticles,...
Hydrophilic ZnS nanocrystals with narrow size distribution were synthesized via homogeneous precipitation using EDTA as stabilizer. The as-synthesized products were characterized with XRD, TEM, HRTEM and UV-Vis spectrum. UV-Vis spectra showed that ZnS nanocrystals exhibited strong quantum-confined effect with a blue shift in the band gap of light absorbance. The photocatalytic activity of these nanocrystals...
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