Abstract: Composite nanoparticles of gold and CdS with core/shell geometry have been synthesized by.electrostatic interaction and characterized in this paper. As is shown in the TEM and the size distributiondiagram, the average diameters of Au, CdS and Au/CdS nanoparticles are 6 nm, 8 nm and 19 nmrespectively, and Au/CdS nanoparticles exhibit relatively narrow size distribution and fine dispersity.Like CdS nanoparticles, this kind of nanocomposites also show two peak positions at 485 nm and 543 nm.As we can see from the UV-Vis absorption spectra, blue shift appears on the absorption onset of Au/CdScompared with that of CdS nanoparticles(470 nm), and the SPR peak disappears at about 552 nm of Auin the absorption spectra of Au/CdS nanoparticles.

Key words: Composite nanoparticles of gold and CdS with core/shell geometry have been synthesized by.electrostatic interaction and characterized in this paper. As is shown in the TEM and the size distributiondiagram, the average diameters of Au, CdS and Au/CdS nanoparticles are 6 nm, 8 nm and 19 nmrespectively, and Au/CdS nanoparticles exhibit relatively narrow size distribution and fine dispersity.Like CdS nanoparticles, this kind of nanocomposites also show two peak positions at 485 nm and 543 nm.As we can see from the UV-Vis absorption spectra, blue shift appears on the absorption onset of Au/CdScompared with that of CdS nanoparticles(470 nm), and the SPR peak disappears at about 552 nm of Auin the absorption spectra of Au/CdS nanoparticles.