Rhodanine stabilized gold nanoparticles for sensitive and selective detection of mercury (II). (July 2017)

• Record Type: Journal Article
• Authors: Chen, Yonglei; Han, Shuyun; Yang, Shenghong; Pu, Qiaosheng
• Is Part Of: Dyes and pigments. Volume 142(2017)
• Page Start: 126
• Page End: 131
• Publication Date: 2017-07
• Subjects: Rhodanine -- Functionalized gold nanoparticles -- Mercury -- Colorimetric sensor; R rhodanine -- AuNPs@R gold nanoparticles capped with R -- T thymine -- LOD limit of the detection -- AAS atomic absorption spectrometry -- AFS atomic fluorescence spectrometry -- ICP-MS inductively coupled plasma mass spectrometry -- RSS resonance scattering spectroscopy -- SPR surface plasma resonance -- DLS dynamic light scattering; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.03.022
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Self-assembling of rhodanine (R) on gold nanoparticles was used to construct a colorimetric sensor for detecting Hg 2+ in aqueous media. Gold nanoparticles capped with R (AuNPs@R) were well dispersed in phosphate buffer (NaH2 PO4 -Na2 HPO4 ) as clear wine red solutions. The presence of Hg 2+ induced aggregation of AuNPs@R and resulted in a color change from wine red to blue. The experimental results indicated that formation of rhodanine-Hg 2+ -rhodanine (R-Hg 2+ -R) structure was the initial driving force of the aggregation, without the use of expensive DNA and complicated functionalization of AuNPs. This aggregation phenomenon is similar to that used for the determination of Hg 2+ by thymine. The color change was successfully used for the determination of Hg 2+ . Under the optimum conditions, the linear relationship between the absorbance ratio A650 /A520 and Hg 2+ concentration was in a range of 0.02–0.5 μM, and the limit of the detection (LOD) was 6.0 nM. The color change was evident and it is possible to recognize the presence of Hg 2+ as low as 0.1 μM by the naked eye. The method avoids complicated surface modifications and tedious separation processes. Its applicability was verified by analysis of Hg 2+ in tap water and lake water with the quantitative spike recoveries ranging from 94.8 to 110%. Graphical abstract: Simple, cost-effective and sensitive detection of mercury (II) based on rhodanine stabilized gold nanoparticles. Highlights: Gold nanoparticles with self-assembled rhodanine were used as a sensor for Hg 2+ . The sensor is simple, cost-effective and sensitive with an LOD of 6 nM. 0.1 μM of Hg 2+ could be detected with the naked eye based on the color change.