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AFM and micro-Raman investigation on filters coated with silver colloidal nanoparticles

机译:原子力显微镜和微拉曼光谱研究包覆银胶体纳米粒子的滤光片

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摘要

Rough silver surfaces are obtained by filtration of silver colloidal suspensions through aluminium oxide membranes. This technique leads to a deposited layer of nanostructured metal, which ensures an efficient surface enhanced Raman scattering (SERS) effect. As detected by atomic force microscopy (AFM), the surface is constituted by silver spheroids with 30 nm as average diameter. The Ag particles can assembly forming some isolated bumps higher than 200 nm. The micro-Raman investigation is here combined with the AFM measurements to analyse the surface morphology by evaluating the SERS enhancement of p-nitrobenzoic acid, as organic ligand. The SERS signal results strongly enhanced when the laser beam is focalised on the prominent metal clusters.
机译:通过将胶体银悬浮液通过氧化铝膜过滤,可获得粗糙的银表面。该技术导致了纳米结构金属的沉积层,从而确保了有效的表面增强拉曼散射(SERS)效果。如通过原子力显微镜(AFM)检测到的,该表面由平均直径为30nm的银类球体构成。 Ag颗粒可以组装形成一些高于200nm的孤立的凸起。此处将显微拉曼研究与AFM测量结合起来,通过评估作为有机配体的对硝基苯甲酸的SERS增强来分析表面形态。当激光束聚焦在突出的金属簇上时,SERS信号的结果会大大增强。

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