表面增强能量转移效应的研究

The Study of Surface Enhanced Energy Transfer Effect

通过分析 2、2′菁染料水溶液、银胶体以及 2、2′菁染料吸附于银胶表面时的吸收光谱得知 ,2、2′菁染料吸附于银胶表面时 ,有J聚集体出现 ,通过分析基频及高阶线性Raman光谱 ,证实了一些低波数的Raman信号是由J聚集体产生的 ,从而进一步证实了吸附于银胶表面的 2、2′菁染料以单体和J聚集体形式共存 同时 ,由吸收光谱还可以看出 ,2、2′菁染料分子及其J聚集体分子的吸收带都处于银胶吸收带的半高宽范围内 ,满足共振条件 ,当用不同激发波长 (5 14 .5nm和 4 88nm)的光激发吸附于银胶表面的 2、2′菁染料时 ,观察到了J聚集体的敏化荧光 ,而用此激发光激发 2、2′菁染料水溶液时 ,就没有观察到J聚集体的敏化荧光 ,从而说明了银胶表面的存在 ,加速了单体 2。

On the basis of absorption spectra of 2,2′-cyanine solution,cilver colloid and 2,2′-cyanine adsorbed on cilver colloid, it was found that the J-aggregated molecule was formed when 2,2′-cyanine adsorbed on cilver colloid. By analyzing the fundamental and higher order linear Raman scattering of J-aggregated molecule adsorbed on cilver colloid, it was indicated that some of the low frequency bands in Raman spectrum are mainly due to J-aggregated molecule. This result proved that when 2,2′-cyanine adsorbed on cilver colloid, it co-exists in the form of monomer and J-aggregated molecule.On the other hand ,by using different wavelength (514 5 nm、488 0 nm) exciting 2,2′-cyanine adsorbed on cilver colloid, the fluorescence of J-aggregated molecule has been observed. However, the fluorescence of J-aggregated molecule hasn′t been detected in the solution of 2,2′-cyanine .This result illustrated that the existence of cilver colloid could accelerate the energy transfer rate between 2,2′-cyanine and its J-aggregated molecule.