【Abstract】 There are an absorption peak at 485 nm and a synchronous fluorescence peak at 510 nm for fluorescein in the medium of 3.4×10 -3 mol/L tri-sodium citrate. The gold nanoparticle system exhibits a characterization resonance scattering peak at 580 nm. In the coexisting system of gold nanoparticle and fluorescein, there are a synchronous fluorescence peak at 510 nm and a resonance scattering peak at 580 nm. It has been found that the fluorescence peak may be quenched by gold nanoparticle. When the concentration of fluorescein is higher, the A 470 nm affects the I 470 nm of gold nanoparticle. The I 470 nm decreases exponentially with the concentration of fluorescein.更多还原