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7083415 
Journal Article 
Surface reaction strategy for Raman probing trace cadmium ion 
Guo, X; Yang, H; Ke, Q; Xiao, D; Ma, Z; Zheng, Q; Wang, Dan; Wu, Y; Ying, Ye; Wen, Y; Wang, F; , 
2020 
Yes 
Arabian Journal of Chemistry
ISSN: 1878-5352 
ELSEVIER 
AMSTERDAM 
6544-6551 
WOS:000554775400004 
Prevalent contamination of water by cadmium ion (Cd2+) brings environmental risk, which threatening to human health including renal dysfunction, reduced lung capacity, and some cancers. It calls for rapid, sensitive and selective protocol to analyze Cd2+ on field. In this work, specific Raman probe is rationally designed by gold nanoparticles (AuNPs) functionalized with tripeptide glutathione (GSH) and Rhodamine 6G (R6G) (denoted as R6G/GSH/AuNPs), which is explored for indirectly determining trace Cd2+ in river water. Based on chelating interaction between GSH and Cd2+ to form tetrahedral Cd(SG)(4), which trends easy detachment from R6G/GSH/AuNPs. With increasing Cd2+ concentration, the Raman probe without protection of GSH happens due aggregation and Raman signal of R6G increases correspondingly. The R6G/ GSH/AuNPs-based Raman detection of Cd2+ in river water shows rapidness, excellent sensitivity, selectivity and good repeatability. Limit of detection of 10 ppb with a widely linear range of 0.5-20 ppm could be achieved. It could be perspective that such Raman probe could be extended to be used for on-site monitoring trace Cd2+ in river water system. (C) 2020 The Author(s). Published by Elsevier B.V. on behalf of King Saud University.