균일 침전법에 의한 은 나노 입자 합성

Abstract

Silver particles were synthesized from silver nitrate by homogeneous precipitation and chemical reduction methods involving the intermediate silver cyanate. The obtained silver particles were characterized by XRD, SEM, TEM, and BET. Urea which could prevent the agglomeration of the reduced silver particles was used as a homogeneous precipitator. The spherical silver particles with average particle diameter of 100 nm were obtained under the optimum reaction conditions. The optimum synthetic conditions were found as follows: reaction temperature <TEX>$100^{\circ}C$</TEX>, reaction time 60 min, concentration of silver nitrate <TEX>$1{\times}10^{-2}$</TEX> mol, urea <TEX>$5{\times}10^{-3}$</TEX> mol, and sodium citrate <TEX>$8.5{\times}10^{-4}$</TEX> mol. The phase of obtained silver particles was crystalline state and the silver particles were relatively dense, which had the surface area of <TEX>$0.7571\;m^{2}/g$</TEX>.