A sensitive Galvanic replacement reaction-SERS method for Au(III) with Victoria blue B molecular probes in silver nanosol substrate
A sensitive Galvanic replacement reaction-SERS method for Au(III) with Victoria blue B molecular probes in silver nanosol substrate
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银纳米溶胶基质中维多利亚蓝B分子探针灵敏电偶置换反应-SERS法测定Au(III)
DOI：
10.1016/j.snb.2017.05.091
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发表时间：
2017-11
影响因子：
8.4
通讯作者：
Liang Aihui
中科院分区：
文献类型：
--
作者：
Jiang Zhiliang;Li Chongning;Liu Yuyao;Jing Qi;Liang Aihui
采用光波法制备了稳定银纳米溶胶（AgNP）。基于Au（III）在AgNP表面的电替换反应（GRR），以维多利亚蓝B （VBB）为分子探针，建立了痕量Au（III）的表面增强拉曼散射（SERS）定量分析方法。在分散的AgNP溶胶衬底中，VBB没有SERS信号。加入NaCl后，VBB在聚集的AgNP溶胶衬底的1381 cm−1处产生了强的表面增强拉曼信号。当体系中存在Au（III）时，由于电位差，表面Ag原子与Au（III）相互作用形成Ag+和Au， Au原子和AgCl沉积在AgNP表面，SERS活性显著降低，SERS信号猝灭。淬灭SERS信号与Au（III）浓度在25 ~ 625 nmol/L范围内呈线性关系，检出限为8 nmol/L。GRR系统还可以通过共振瑞利散射（RRS）光谱进行监测，可以通过SERS和RRS方法检测Au，其中SERS方法灵敏度更高。
Stable silver nanosol (AgNP) was prepared by the light-wave procedure. Based on the Galvanic replacement reaction (GRR) of Au(III) on AgNP surface and using Victoria blue B (VBB) as molecular probes, a surface-enhanced Raman scattering (SERS) quantitative analysis of trace Au(III) was developed. VBB has no SERS signal in the dispersed AgNP sol substrate. Addition of NaCl, the VBB produced strong surface-enhanced Raman signals at 1381 cm−1in the aggregated AgNP sol substrate. When Au(III) is present in the system, the surface Ag atoms interact with Au(III) to form Ag+and Au due to the potential difference, and the Au atom and AgCl deposited on the AgNP surface to reduce the SERS activity significantly and result in SERS signal quenching. The quenched SERS signal is linear to Au(III) concentration in the range of 25–625 nmol/L, with a detection limit of 8 nmol/L. The GRR system can be also monitored by resonance Rayleigh scattering (RRS) spectroscopy, Au can be detected by SERS and RRS methods, and the former is more sensitive.
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