一种基于贵金属纳米粒子作为探针的灵敏局域表面等离子体共振传感器用于测定汞(II)离子。

A sensitive localized surface plasmon resonance sensor for determining mercury(II) ion using noble metal nanoparticles as probe.

机构信息

College of Chemistry, Jilin University, Changchun 130012, PR China.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2012 Sep;95:276-81. doi: 10.1016/j.saa.2012.04.086. Epub 2012 Apr 26.

DOI:10.1016/j.saa.2012.04.086

Abstract

The noble metal nanoparticles (NPs), including gold nanorods (AuNRs), gold nanospheres (AuNSs) and silver nanoplates (AgNPTs), were synthesized and Tween 20 stabilized NPs (Tween 20-NPs) were used as the probes for determining Hg(2+). Hg(2+) was determined based on the strong affinity between Au (Ag) and Hg. Hg(2+) was reduced to Hg in the presence of sodium borohydride. Hg interacts with the NPs and the diameter of the NPs decreases with the increase of Hg(2+) concentration, which causes the shift in absorption peak of Tween 20-NPs. The peak shifts are linearly related to Hg(2+) concentrations. Compared with AuNSs and AgNPTs, when the AuNRs was used, the sensitivity for determining Hg(2+) was higher. The developed method shows a good selectivity for Hg(2+) and can be applied to the determination of Hg(2+) in water samples.

摘要

贵金属纳米粒子（NPs），包括金纳米棒（AuNRs）、金纳米球（AuNSs）和银纳米盘（AgNPTs），被合成出来，并用吐温 20 稳定的 NPs（Tween 20-NPs）作为测定 Hg(2+)的探针。Hg(2+)的测定是基于 Au（Ag）与 Hg 之间的强亲和力。在硼氢化钠的存在下，Hg(2+)被还原为 Hg。Hg 与 NPs 相互作用，随着 Hg(2+)浓度的增加，NPs 的直径减小，导致 Tween 20-NPs 的吸收峰发生位移。峰位移与 Hg(2+)浓度呈线性关系。与 AuNSs 和 AgNPTs 相比，当使用 AuNRs 时，测定 Hg(2+)的灵敏度更高。所开发的方法对 Hg(2+)具有良好的选择性，并可应用于水样中 Hg(2+)的测定。