金纳米粒子共振散射与共振吸收的关系

Relationship Between Resonance Scattering and Resonance Absorbance of Gold Nanoparticles

采用共振散射光谱和透射电镜研究了金纳米粒子. 结果表明,粒径为10 nm、Au的质量浓度为0～35.4×10-6 g/mL的金纳米粒子溶液在525 nm处分别产生1个共振吸收峰和1个共振散射峰. 粒径为50 nm、Au的质量浓度为0～17.7×10-6 g/mL的金纳米粒子溶液在530 nm处分别产生1个共振吸收峰和1个共振散射峰. 当金纳米粒子浓度较高时,存在共振散射峰红移和猝灭现象. 从光子与纳米粒子界面超分子能带电子作用及光子与纳米粒子之间发生多次散射的角度出发,探讨了金纳米粒子共振散射峰和共振吸收峰的对应关系及其共振散射峰红移和猝灭的机理.

Gold nanoparticles were studied with resonance scattering spectroscopy and trans mission electron microscopy. When the concentration of gold nanparticles with d=10 nm is less than 35.4×10-6 g/mL, there are a max absorption peak a t 525 nm and a resonance scattering peak at 525 nm. When the concentration of go ld nanparticles with d=50 nm is less than 17.7×10-6 g/mL, there are a max absorption peak at 530 nm and a resonance scattering peak at 530 nm. When the concentration of gold nanoparticles is higher, there are red-shift of reson ance scattering peak and resonance scattering quenching. On the basis of the int eraction between the excited photon and the interface electron of nanoparticles, as well as the multi-scattering occured due to the interaction between photons and nanoparticles, the relationship between resonance scattering and resona nce absorbance, the red-shift and quenching of resonance scattering peak were s tudied.