Surface-enhanced Raman scattering (SERS) from Au:Ag bimetallic nanoparticles: the effect of the molecular probe

双金属片 拉曼散射 纳米颗粒 分子 材料科学 高分辨率透射电子显微镜 基质(水族馆) 硫酚 拉曼光谱 吸附 合金 分析化学(期刊) 光化学 纳米技术 化学 物理化学 金属 有机化学 透射电子显微镜 地质学 复合材料 物理 光学 冶金 海洋学
作者
Meikun Fan,Feng‐Ju Lai,Hung‐Lung Chou,Wan-Ting Lu,Bing−Joe Hwang,Alexandre G. Brolo
出处
期刊:Chemical Science [Royal Society of Chemistry]
卷期号:4 (1): 509-515 被引量:184
标识
DOI:10.1039/c2sc21191b
摘要

Surface-enhanced Raman scattering (SERS) from molecular probes adsorbed on Au:Ag bimetallic nanoparticles with various compositions was investigated. Au:Ag bimetallic nanoparticles (NPs), with the diameters between 3–5 nm, were prepared and characterized by HRTEM and UV-Vis absorption. Their SERS properties were examined by using four different probe molecules, and compared with NPs made of pure Au or Ag. It is found that the SERS property of the alloy NPs is not only dependent on the Au:Ag ratio of the bimetallic NPs, but also on the chemical nature of the SERS probe. For the two positively charged SERS probes, oxazine 720 (Oxa) and Nile Blue A (NBA), the alloy NPs with higher Au content provided the largest SERS signal. However, for the probes 4-hydroxythiophenol (HTP) and thiophenol (TP), the best SERS performance was obtained for the highest Ag ratio. DFT calculations indicated a charge-transfer between Au and Ag atoms in the alloys, creating positively charged domains rich in Ag atom, and negatively charge regions dominated by Au atoms. It is proposed that the probe-specific enhancement is related to the selective binding of probe molecules to the partially charged surface domains in the alloys. Our results suggest that SERS substrate optimizations based on bimetallic nanoparticles should consider the nature of the probes and the electronic-induced effects from the alloys.
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