纳米银溶胶中超痕量分子的Raman光谱

Raman Spectra of Ultra-trace Amount of Molecules in Nano-Ag Sols

根据柠檬酸钠还原硝酸盐的原理制备直径为80-90 nm的银纳米颗粒溶胶,采用1 mW激光功率和5 s积分时间,通过表面增强Raman散射技术检测到浓度为10-13mol/L水中的超痕量若丹明6G分子,通过制备银纳米膜的方法检测到浓度为10-11mol/L的超痕量R6G分子.实验结果表明,若银纳米颗粒的密度降低,则其增强Raman散射的能力减弱.

Ag colloidal particles in a size range of about solution reduced with sodium citrate. We collected 80-90 nm were prepared by silver nitrate the surface-enhanced Raman spectra of 10^-13 mol/L aqueous R6G via 1 mW of laser power and 5 s of integration time. 10^11 mol/L aqueous R6G was detected by airdried Ag-film method. When the density of Ag colloidal particles decreased, then the ability of surface-enhanced Raman scattering decreased rapidly.