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本文采用热蒸发法制备得到纳米Ag颗粒作为增强拉曼衬底,利用入射光子与纳米颗粒表面价电子的相互作用机理,激发出高能表面等离子激元,其表面等离子形成的高能“热点”起到表面增强拉曼散射效果.通过比较不同入射光强下的拉曼峰强,指出纳米Ag颗粒的增强拉曼散射效果可以实现低探测光强下的高散射强度,即纳米Ag颗粒的表面等离子激元具有非线性的表面增强拉曼散射效果,可降低对样品的光、热损伤,以利于拓展拉曼散射光谱的应用范围.同时比较不同纳米Ag颗粒衬底的表面增强拉曼散射效果表明,采用的热蒸发工艺具有较大的工艺域度,具有较强的工艺兼容性.
In this paper, nano-Ag particles were prepared by thermal evaporation as the enhanced Raman substrate. By using the interaction mechanism between the incident photons and the surface valence electrons of the nanoparticles, the high-energy surface plasmon was excited and the high-energy “hot spots” Surface enhanced Raman scattering effect by comparing different incident light intensity Raman peak intensity, pointed out that nano-Ag particle enhanced Raman scattering effect can achieve low detection intensity under high scattering intensity, that is, the surface of nano-Ag particles Plasmon has a nonlinear surface-enhanced Raman scattering effect, which can reduce the light and thermal damage to the sample, in order to expand the range of application of Raman scattering spectroscopy.Meanwhile, the surface enhanced Raman scattering effect of different Ag nano-particle substrates is compared It shows that the thermal evaporation process adopted has a larger technological area and has stronger process compatibility.