Abstract
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 2−4 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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This work was supported by the National Natural Science Foundation of China (no. 21075023, 20865002, 20965002), Natural Science Foundation of Guangxi (no. 0991021z), the Research Funds of Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, and the Research Funds of Guangxi Education Office.
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Luo, Y., Li, K., Wen, G. et al. A Rapid Surface-Enhanced Raman Scattering Method for the Determination of Trace Hg2+ Using Rhodamine 6G-Aggregated Nanosilver as Probe. Plasmonics 7, 461–468 (2012). https://doi.org/10.1007/s11468-012-9329-5
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DOI: https://doi.org/10.1007/s11468-012-9329-5