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利用模板印刷技术,制备了具有不同局域表面等离子体共振(LSPR)峰的Au纳米空心半球壳结构,并以4-巯基苯胺(4-ATP)为探针分子研究了纳米结构表面吸附分子对表面增强拉曼散射(SERS)强度的影响。结果表明,当纳米结构的LSPR峰位处于激发光波长的短波长或“马鞍型”位置时,SERS强度随吸附分子数的增加而增大;当处于长波长位置时,SERS强度呈现先增大后减小的趋势。利用分子吸附理论和纳米结构表面局域场强度变化,对此现象进行了解释。
The Au nanometer hollow hemispherical shell structure with different LSPR peaks was prepared by using the template printing technique. The adsorption of molecules on the surface of nanostructures by 4-mercaptoaniline (4-ATP) Effect of Surface Enhanced Raman Scattering (SERS) Intensity. The results show that the intensity of SERS increases with the number of adsorbed molecules when the LSPR peak of the nanostructures is at the short wavelength or the “saddle” position of the excitation wavelength. When the LSPR peak is at the long wavelength, Increase and then decrease the trend. This phenomenon is explained by the theory of molecular adsorption and the variation of the local field strength of nanostructured surface.