科研之友
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摘要
Unbiodegradable toxic Hg2+ accumulates in ecological systems and results in contaminated food chain, exposing us to high level pollution and healthy risk. Here, monolayer 2,5-Dimercapto-1,3,4-thiadiazole (DMcT) functionalized Au@Ag nanoparticles (NPs) were controllably constructed as a label-free SERS probe. Based on them, we can perform rapid and easy Hg2+ identification with high sensitivity and selectivity over competing analytes. Remarkably, DMcT acted as both interior label and target acquisition. Since DMcT showed intrinsic Raman signal when attached to substrates surface, it can be employed for quantification instead of extra conventional signal label. Also, we've demonstrated that DMcT coordinated on the surface of Au@Ag NPs as bidentate ligand with both the thiocarbonyl sulfur atoms while the nitrogen atoms on the different sides of the molecule were devoted to Hg2+ recognition. Owing to the strong coordination between Hg2+ and nitrogen atoms, as low as 10 pM Hg2+ can be detected. The probe responded a good linear relationship ranging from 0.05 to 100 nM and the limit of detection is similar to 3 orders of magnitude lower than the United States Environmental Protection Agency (USEPA)-defined limit (10 nM) in drinkable water (EPA: Washington, DC, 2001). Furthermore, our suggested platform is highly effective to perform real samples detection. Utilizing the environmental water from East Lake, Wuhan, it resulted in better accuracy over the conventional standard method.
- 出版日期2017-1-1
- 单位武汉大学
