Journal
ANALYST
Volume 136, Issue 13, Pages 2825-2830Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1an15113d
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Funding
- Zhejiang Provincial Natural Science Foundation of China [R5110230]
- Chinese Academy of Sciences
- Bureau of Academy-Locality Cooperation Chinese Academy of Sciences
- Ningbo Natural Science Foundation of China [2009A610122, 2010A610159]
- CAS/SAFEA International Partnership Program for Creative Research Team
- Science and Technology Innovative Research Team of Ningbo Municipality [2009B21005]
- National Natural Science Foundation of China [20705002]
- Scientific Research Foundation
- States of Education Ministry
- State of Ministry of Human Resources & Social Security
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A new approach for the detection of Hg2+ is reported based on color changes from which gold nanoparticles (Au NPs) are surrounded by a layer of HgS quantum dots to form in situ Au@HgS core-shell nanostructures. The surface plasmon resonance (SPR) absorption of the gold core was changed due to a shell layer of HgS formed on the surface of the Au NPs, which brings the colour change of the aqueous solution. Therefore, Hg2+ can be recognized by visualizing the colour change of the Au@HgS core-shell nanostructures, and can be detected quantitatively by measurement of the UV-vis spectra. Some effects on the detection of Hg2+ were investigated in detail. This method was used to detect Hg2+ with excellent selectivity and high sensitivity. In our method, the lowest detected concentrations for mercury ions were 5.0 x 10(-6) Mobserved by the naked eye and 0.486 nM as measured by UV-vis spectra. At the range from 8.0 x 10(-5) to 1.0 x 10(-8) M of Hg2+, this method was shown to have a good linear relationship.
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