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采用波长为248nm的KrF准分子激光烧蚀制备纯净的金核银壳复合纳米结构,通过高分辨透射电子显微镜(HRTEM)以及电子能谱(EDS)对其形貌结构和成分进行了表征。实验发现,控制银壳的厚度能够调节该纳米结构的表面等离共振吸收曲线峰位,采用Mie理论对金核银壳纳米结构在形成过程中的表面等离共振吸收曲线进行了模拟,模拟结果与实验结果一致。探讨了激光烧蚀法制备金核银壳纳米结构的机制。此外,实验结果表明准分子激光烧蚀法制备的金核银壳纳米结构具有优异的表面增强拉曼光谱(SERS)活性,可用于物质痕量检测领域。
The pure gold-silver shell composite nanostructures were fabricated by KrF excimer laser ablation with a wavelength of 248 nm. The morphology and composition of the nanostructures were characterized by high resolution transmission electron microscopy (HRTEM) and electron spectroscopy (EDS). The experimental results show that controlling the thickness of the silver shell can adjust the peak position of the surface plasmon resonance absorption curve of the nanostructure. The Mie theory is used to simulate the surface plasmon resonance absorption curve during the formation of the gold core silver shell nanostructure. The simulation results Consistent with the experimental results. The mechanism of laser ablation for the preparation of Au-Ag silver shell nanostructures was discussed. In addition, the experimental results show that the gold core silver shell nanostructures prepared by excimer laser ablation have excellent surface enhanced Raman spectroscopy (SERS) activity and can be used in the field of material trace detection.