We report on surface-enhanced Raman scattering (SERS) activity of bimetallic core-shell Au@Ag nanorods. These nanostructures feature four plasmon maxima in the UV-visible range. Their application for SERS analysis enables matching individual optical properties of organic analytes using the optimal excitation wavelength resonant both for plasmon nanostructures and analytes. It promotes higher sensitivity of surface-enhanced resonance Raman scattering (SERRS) of specific analytes. The intensity of SERRS spectrum is higher up to 2 orders of magnitude for alizarin and up to 4 times for malachite green as compared to the corresponding SERS spectra. Thus Au@Ag nanorods can be used as a single SERRS substrate for sensitive analysis of a number of dyes.

中文翻译：

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用于SERS光谱分析染料的Au @ Ag纳米棒

我们报告了双金属核-壳Au @ Ag纳米棒的表面增强拉曼散射（SERS）活性。这些纳米结构在紫外线可见范围内具有四个最大等离子体激元。它们在SERS分析中的应用能够使用针对等离激元纳米结构和分析物的最佳激发波长共振来匹配有机分析物的各个光学性质。它可以提高特定分析物的表面增强共振拉曼散射（SERRS）的灵敏度。与相应的SERS光谱相比，茜素的SERRS光谱强度更高，高达2个数量级，而孔雀石绿的SERRS光谱强度高达4倍。因此，Au @ Ag纳米棒可以用作单个SERRS底物，用于多种染料的灵敏分析。