SERS Detection of Hg2+ using Rhenium Carbonyl Labelled Nanoparticle Films

IF 6.1 Q1 CHEMISTRY, MULTIDISCIPLINARY
Dr. Joshua N. Lea, Dr. Heather J. Montgomery, Dr. Yikai Xu, Prof. Steven E. J. Bell, Dr. Lorna Ashton, Dr. Nicholas C. Fletcher
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Abstract

Modified silver nanoparticles with a self-assembled disulfide functionalized 2,2'-bipyridine (L1 and L2) monolayer, and the corresponding rhenium complex [Re(L2)(CO)3Br] are shown to provide a method to position the nanoparticles at a water/dichloromethane interface forming a lustrous metal-like-liquid film (MeLLF) with a unique SERS response. The film formed using L2 showed divergent behaviour in the presence of a range of metal ions whilst bound to the surface. [Re(L)(CO)3Br] (where L=2,2'-bipyridine, L1 and L2) in solution demonstrates a selective interaction with Hg2+, observed by UV-vis, emission and 1H NMR spectroscopy, attributed to abstraction of the bromide. This interaction was demonstrated by subtle changes in the characteristic Raman Re-CO stretch at 510 cm−1 both with the MeLLF, and when the film is immobilized in a PVA surface-exposed-nano-sheet (SENS). The work provides proof of concept that the organometallic complexes can be employed as “labels” to generate SERS-active nanoparticle films that possess detection capabilities.

Abstract Image

铼羰基标记纳米颗粒膜对Hg2+的SERS检测
具有自组装二硫化物功能化的2,2'-联吡啶(L1和L2)单层和相应的铼络合物[Re(L2)(CO)3Br]的改性银纳米颗粒被证明提供了一种将纳米颗粒定位在水/二氯甲烷界面上的方法,从而形成具有独特SERS响应的有光泽的类金属液膜(MeLLF)。使用L2形成的膜在与表面结合的同时,在一系列金属离子的存在下表现出发散行为。溶液中的[Re(L)(CO)3Br](其中L=2,2'-联吡啶,L1和L2)通过紫外-可见光谱、发射光谱和1H NMR光谱观察到与Hg2+的选择性相互作用,这归因于溴化物的提取。510处拉曼Re‐CO伸缩特性的细微变化证明了这种相互作用 cm−1,无论是使用MeLLF,还是当薄膜固定在PVA表面暴露的纳米片(SENS)中时。这项工作提供了概念证明,即有机金属配合物可以用作“标签”来产生具有检测能力的SERS活性纳米颗粒膜。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.30
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