一种新型银纳米链 SERS 分析平台，结合罗丹明 S 分子探针检测痕量六偏磷酸钠。

A new silver nanochain SERS analytical platform to detect trace hexametaphosphate with a rhodamine S molecular probe.

机构信息

Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection of Ministry of Education; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guangxi Normal University, Guilin, 541004, China.

出版信息

Luminescence. 2016 May;31(3):640-8. doi: 10.1002/bio.3004. Epub 2015 Aug 17.

DOI:10.1002/bio.3004

PMID:26280554

Abstract

Using AgNO3 as the precursor, stable silver nanochain (AgNC) sols, orange-red in color, were prepared using hydrazine hydrate. A strong surface plasmon resonance Rayleigh scattering (RRS) peak occurred at 420 nm plus two surface plasmon resonance (SPR) absorption peaks at 410 nm and 510 nm. Rhodamine S (RhS) cationic dye was absorbed on the as-prepared AgNC substrate to obtain a RhS-AgNC surface-enhanced Raman scattering (SERS) nanoprobe that exhibited a strong SERS peak at 1506 cm(-1) and a strong RRS peak at 375 nm. Upon addition of the analyte sodium hexametaphosphate (HP), it reacted with RhS, which resulted in a decrease in the SERS and RRS peaks that was studied in detail. The decreased SERS and RRS intensities correlated linearly with HP concentration in the range of 0.0125-0.3 µmol/L and 0.05-1.0 µmol/L, with a detection limit of 6 nmol/L and 20 nmol/L HP respectively. Due to advantages of high sensitivity, good selectivity and simple operation, the RhS molecular probes were used to determine HP concentration in real samples.

摘要

以硝酸银为前驱体，采用水合肼制备了稳定的橙红色银纳米链（AgNC）溶胶。在 420nm 处出现了一个强的表面等离子体共振瑞利散射（RRS）峰，同时在 410nm 和 510nm 处出现了两个表面等离子体共振（SPR）吸收峰。罗丹明 S（RhS）阳离子染料被吸附在制备的 AgNC 基底上，得到了 RhS-AgNC 表面增强拉曼散射（SERS）纳米探针，在 1506cm(-1)处表现出强的 SERS 峰和在 375nm 处表现出强的 RRS 峰。加入分析物六偏磷酸钠（HP）后，它与 RhS 反应，导致 SERS 和 RRS 峰强度降低，对其进行了详细研究。SERS 和 RRS 强度的降低与 0.0125-0.3µmol/L 和 0.05-1.0µmol/L 范围内的 HP 浓度呈线性相关，HP 的检测限分别为 6nmol/L 和 20nmol/L。由于具有高灵敏度、良好选择性和操作简单的优点，RhS 分子探针被用于测定实际样品中的 HP 浓度。