SYNTHESIS OF SILVER NANOSHEETS ONTO SOLID SUBSTRATES BY USING SEED-MEDIATED GROWTH METHOD

Abstract

Silver nanosheets, with average size tunable from 30 to 100 nm, have been synthesized onto solid substrates by using seed-mediated growth method. The growth of silver nanosheets have been carried out at temperature of 30°C in the presence of a binary surfactant mixture: cetyl trimethyl ammonium bromide (CTAB) and poly-vinyl pyrrolidone (PVP) with their various concentrations. The effect of concentration of the surfactants on the grown silver nanosheets were evaluated. Characterizations of the samples have been performed by using UV-Vis spectroscopy, X-ray diffraction (XRD) and field-emission scanning electron microscope (FESEM). UV-Vis spectra showed that the silver nanoparticles have grown with a various geometrical forms. XRD results confirmed that the presence of two peaks at 2θ: 38.119o and 44.305° indicated the silver nanosheets, with their crystal orientation of (111) and (200). FESEM images of the best samples showed the edge-length size of silver nanosheets was dominated in the range of 30-100 nm, with various morphologies of nanosheets, such as triangular, hexagonal and spherical shapes.