Self-assembled monolayers of bimetallic Au/Ag nanospheres with superior surface-enhanced Raman scattering activity for ultra-sensitive triphenylmethane dyes detection

被引：31
|
作者：
Tian, Yue [1 ]
Zhang, Hua [1 ]
Xu, Linlin [1 ]
Chen, Ming [1 ]
Chen, Feng [1 ]
机构：
[1] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China
来源：
OPTICS LETTERS | 2018年 / 43卷 / 04期
基金：
中国国家自然科学基金;
关键词：
SERS SUBSTRATE; CRYSTAL VIOLET; SPECTROSCOPY; AU; NANOPARTICLES; LAYER;
D O I：
10.1364/OL.43.000635
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The bimetallic Au/Ag self-assembled monolayers (SAMs) were constructed by using mono-dispersed Au/Ag nanospheres (Ag: 4.07%-34.53%) via evaporation-based assembly strategy. The composition-dependent surface-enhanced Raman scattering (SERS) spectroscopy revealed that the Au/Ag (Ag: 16.83%) SAMs provide maximized activity for triphenylmethane dyes detection. With the intermetallic synergy, the optimized SAMs enable the Raman intensity of crystal violet molecules to be about 223 times higher than that of monometallic Au SAMs. Moreover, the SERS signals with excellent uniformity (<5% variation) are sensitive down to 10(-13) M concentrations because of the optimal matching between bimetallic plasmon resonance and the incident laser wavelength. (C) 2018 Optical Society of America
引用
收藏
页码：635 / 638
页数：4
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