Journal
ANALYTICA CHIMICA ACTA
Volume 723, Issue -, Pages 88-93Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.02.031
Keywords
Bismuthiol II; Gold; Colorimetry; Surface-enhanced Raman scattering; Mercury; Sensor
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Funding
- National Basic Research Program of China (973 Program) [2007CB936602]
- Shandong Provincial Natural Science Foundation for Distinguished Young Scholar [JQ201004]
- National Natural Science Foundation of China [NSFC 50972083, 21075077]
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The addition of Bismuthiol II to the gold nanoparticles (AuNPs) solution led to the aggregation of AuNPs with a color change from red to blue. As a result, hot spots were formed and strong surface-enhanced Raman scattering (SERS) signal of Bismuthiol II was observed. However, the Bismuthiol II-induced aggregation of AuNPs could be reversed by Hg2+ in the system, accompanied by a remarkable color change from blue to red. As evidenced by UV-vis and SERS spectroscopy, the variation in absorption band and SERS intensity was strongly dependent on the concentration of Hg2+, suggesting a colorimetric and SERS dual-signal sensor for Hg2+. The sensor had a high sensitivity, low detection limits of 2 nM and 30 nM could be achieved by UV-vis spectroscopy and by SERS spectroscopy. respectively. Other environmentally relevant metal ions did not interfere with the detection of Hg2+. The method was successfully applied to detect Hg2+ in water samples. It was simple, rapid and cost-effective without any modifying or labeling procedure. (C) 2012 Elsevier B.V. All rights reserved.
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