Journal
PLASMONICS
Volume 7, Issue 3, Pages 461-468Publisher
SPRINGER
DOI: 10.1007/s11468-012-9329-5
Keywords
Hg2+; Rhodamine 6G; Aggregated nanosilver suspension; SERS
Funding
- National Natural Science Foundation of China [21075023, 20865002, 20965002]
- Natural Science Foundation of Guangxi [0991021z]
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education
- Guangxi Education Office
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In pH 6.0 Na2HPO4-NaH2PO4 buffer solution and in the presence of cetyltrimethyl ammonium bromide, nanosilver particles were aggregated to a stable suspension. Therein, rhodamine 6G (Rh6G) exhibited three strong surface-enhanced Raman scattering (SERS) peaks at 613, 1,363, and 1,510 cm(-1), and their SERS intensities were enhanced when the concentration of Rh6G increased. In the presence of Hg2+, the SERS intensity decreased greatly owing to formation of stable Rh6G-HgBr (4) (2-) ternary association complex molecules as well as its particles. In the optimal condition, the decreased SERS intensity at 613 cm(-1) responds linearly with the concentration of Hg2+ over 25-2,000 nmol/L. Thus, a new sensitive SERS method has been proposed for the determination of trace Hg2+ in the water sample, with satisfactory results.
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