金纳米薄膜的荧光光谱特性

采用电化学方法制备了胶体盒纳米球状颗粒，并利用自组装方法在石英玻璃村底上镀制了金纳米薄膜。在室温下测得其紫外-可见吸收光谱和荧光发射光谱。在吸收光谱中观察到两个吸收峰，其中610nm、处的吸收峰来源于凝聚金纳米颗粒纵向的表面等离子体共振。在荧光发射光谱中也观察到与纵向表面等离子体共振有关的长波段的发射峰。增加激励光强度或增加薄膜中金粒子散密度都将导致新荧光发射峰的产生．这表明金纳米薄膜中存在循环多重散射，并由此引发了荧光发射峰数目和强度的变化。

Fluorescence Spectra Characters of Nanostructured Gold Thin-Film

Gold colloid was prepared via electrochemical method. Nanostructured gold thin-films were deposited on glass by using self-assembled technique. UV-visible spectra and fluorescence emission spectra were measured at room temperature. The absorption spectrum features show two peaks and the longer wavelength one at 610 nm corresponds to linear aggregated gold nanochains. The fluorescence emission peaks at about 375 nm and 700 nm are due to the local field enhancement via coupling to the transverse and longitudinal surface plasmon resonance from gold nanochains. Both the intensity and number of the fluorescence emission peaks increase with increasing excited light and the layers number. It is indicated that the nanostructured gold thin-films formed a disordered particles system. Further more, multiple scattering takes place in these self-organized random micro-cavities.