The Synthesis of Silver Nanoparticles Produced by Chemical Reduction of Silver Salt Solution

Described in this research are the synthesis of silver nanoparticle produced by chemical reduction of silver salt (silver nitrate AgNO3) solution. As a reducer, sodium citrate (C6H5O7Na3) was used. Preparation of silver colloid is done by using chemical reduction method. In typical experiment 150 ml of 1.10-3 M AgNO3 solution was heated with temperature variation such as 90, 100, 110 degree of Celsius. To this solution 15 ml of 1 % trisodium citrate was added into solution drop by drop during heating. During the process, solution was mixed vigorously. Solution was heated until colour's change is evident (pale yellow solution is formed). Then it was removed from the heating element and stirred until cooled to room temperature. Experimental result showed that diameter of silver nanoparticles in colloid solution is about 28.3 nm (Ag colloid, 90 oC); 19.9 nm (Ag colloid, 100 oC)and 26.4 nm (Ag colloid, 110 oC). Characterization of the silver nanoparticle colloid conducted by using UV-Vis Spectroscopy, Particles Size Analyzer (PSA) and Scanning Electron Microscope (SEM) indicate the produced structures of silver nanoparticles. (author)