SiO_2纳米颗粒对R6G-乙醇溶液荧光光谱影响

Influence of SiO_2 Nanoparticles to Fluorescence Spectra of Ethanol-Rhodamine 6G Solutions

在3×10-4M和1×10-4M浓度的R6G-乙醇溶液中分别掺杂了8个不同浓度的SiO2纳米颗粒（10^7-10^12个/mL）.研究了SiO2纳米颗粒（100 nm）对若丹明6G（R6G）荧光光谱的影响,结果表明：n1-n4（10^12-10^10个/mL）浓度掺杂的SiO2纳米颗粒在549 nm处的有很好的荧光增强作用,对570 nm处的荧光峰有明显的粹灭作用;n5-n8（10^9-10^7个/mL）浓度掺杂的SiO2纳米颗粒在549 nm处没有明显的荧光增强作用,但对570 nm处的荧光峰有增强作用,荧光增强因子可达10%~20%.荧光增强与粹灭的原因在于纳米颗粒对荧光的散射作用和R6G无荧光H-型二聚体或荧光J-型二聚体的形成.

SiO2 nanoparticles with eight different concentrations were doped in the Rhodanmine 6G-ethanol solutions（3×10-4 M and 1×10-4 M）.The influence of SiO2 nanoparticles to the fluorescence spectra of R6G-ethanol solutions were investigated.The results shows：1）when the concentrations of SiO2 within in the range of n1～n4（1012～1010/mL）,the fluorescence spectra at 549 nm were well enhanced,but the fluorescence peaks at 570 nm was obviously quenched and the peaks have a read shift;2） when the concentrations of SiO2 within in the range of n5～n8（10^9-10^7/mL）,the fluorescence spectra at 549 nm were not enhanced significantly,but the fluorescence peaks at 570 nm was obviously enhanced,the enhancement factors can get to 10%-20%,and the peaks do not have a red shift.The reasons of the fluorescence enhancing or quenching are relative to the scattering of the nanoparticles to the luminescence and the non-fluorescent H-dimers or fluorescent J-dimers of R6G moleculars.