Studies on silver nanoparticles synthesized by microemulsion and their fluorescence
微乳液法制备纳米银粒子的结构及其荧光现象研究

Silver nanoparticles with different diameters were synthesized by microemulsion method, in which the effect of toluene or cyclohexane as an oil phase on the particle size and its distribution was detected. Silver nanoparticles were near spherical, both multicrystals and twins were observed. Lattice deformations existed in different degrees because the interplanar space d was increased. The fluorescence spectra for different size silver nanoparticles dispersed in organic solvents were measured. There are three emission peaks for silver nanoparticles/chloroform systems, while no fluorescence emission was found when silver nanoparticles dispersed in toluene. The fluorescence intensity varies with particle size of the silver nanoparticles, which originates from Ag 2, Ag 3 clusters on the silver particle surface produced by the interaction between silver and chloroform under UV radiation. The reactivity and the number of surface reactive centers vary with silver particle size, resulting in the different fluorescence phenomena.