SERS detection of 4-Aminobenzenethiol based on triangular Au-AuAg hierarchical-multishell nanostructure.
SERS detection of 4-Aminobenzenethiol based on triangular Au-AuAg hierarchical-multishell nanostructure.
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DOI：
10.1016/j.saa.2018.06.105
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Jian Zhu;Na Wu;Fan Zhang;Xin Li;Jian-Jun Li;Jun-wu Zhao
中科院分区：
文献类型：
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作者：
Jian Zhu;Na Wu;Fan Zhang;Xin Li;Jian-Jun Li;Jun-wu Zhao
研究了4-氨基苯乙醇（4-ABT）吸附在三角形Au-AuAg多层纳米结构表面的表面增强拉曼信号。在这里，制备以Au-AuAg为形式的核-腔-壳夹层纳米结构的方法与制备具有空心形态的金属纳米颗粒的方法相同，其中银和氯金酸之间发生电替换反应。本文中，我们直接将4-ABT与金纳米粒子混合，并将其滴在玻片上，研究纳米粒子对拉曼光谱信号增强的影响，避免了以往报道中制备金属-分子-金属三层结构的繁琐过程。在1140 cm−1左右，b2mode的SERS强度显著增加，可以间接量化4-ABT的浓度。在一定范围内，拉曼强度随中间间隙的增大而逐渐增大，这与核-介电-壳夹层纳米结构的偶极等离子体杂化密切相关。此外，拉曼光谱结果表明，Au-AuAg衬底产生的信号强度比4-ABT单独产生的信号强度强约3.8 × 102倍，在溶液中的检测限低至0.1 μM。
The surface-enhanced Raman signals of 4-Aminobenzenethiol (4-ABT) adsorbed on the surface of triangular Au-AuAg hierarchical-multishell nanostructure have been investigated. Here, the approach to produce core-cavity-shell sandwich nanostructures presented as Au-AuAg is the same as preparing metal nanoparticles with hollow morphology, in which the galvanic replacement reaction takes place between silver and chloroauric acid. In this paper, we directly mix 4-ABT with gold nanoparticles and drop it on glass slides to study the effect of nanoparticles on signal enhancement of Raman spectrum, avoiding the cumbersome process of preparing metal-molecular-metal three-layer structure as reported. A significant increase in the SERS intensity of b2mode around 1140 cm−1was observed, which could quantify the concentration of 4-ABT indirectly. In a certain range, the Raman intensity gradually increases with the increasing intermediate gap, which has a strong relationship with dipole plasmon hybridization of core-dielectric-shell sandwich nanostructure. Moreover, Raman spectrum results show that the Au-AuAg substrate can produce signal intensity about 3.8 × 102times stronger than that of 4-ABT alone and the detection limit was as low as 0.1 μM in solution.