The interface fluorescence and resonance scattering spectral properties of Ag2S nanoparticles in liquid phase

S~(2-) and Ag~+ form stable Ag_2S nanoparticles in the presence of sodium dodecyl sulphate(SDS). It exhibits a strong (resonance) scattering peak at 470 nm and a strong fluorescence peak at 470 nm when excitation wavelength is at 200 nm. The effects of TAA and Ag~+ concentration on the fluorescence intensities are consistent with those on the resonance scattering signals. The resonance scattering and fluorescence intensities all increase with Ag~+ concentration in the range of 0-8.0×10~(-5) mol·L~(-1). The results verified that there is a correlation between the fluorescence and resonance scattering. The fluorescence is the interface fluorescence of Ag_2S (nanoparticles) in liquid phase.