Journal
TALANTA
Volume 84, Issue 2, Pages 411-415Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2011.01.054
Keywords
Naked-eye colorimetric; Quantum dots; Fluorescence quenching; Hg2+
Categories
Funding
- National Natural Science Foundation of China [20875036, 21075050, 21005029]
- Ministry of Science and Technology of Jilin Province, China [20080544]
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A novel direct quantificational method through naked-eye colorimetric analysis of Hg2+ was constructed based on different degree of the fluorescence quenching of bi-color quantum dots (QDs) multilayer films (2-QDMF). The functional multilayer films were assembled by layer-by-layer (LBL) deposition of oppositely charged CdTe QDs and poly(dimethyldiallylemmonium chloride) (PDDA). Then the outermost layer of 2-QDMF was cross-linked to bovine serum albumin (BSA), polyethylene glycol (PEG) or glutathione (GSH). It was found that when BSA modified quartz slides were immersed into solutions containing Hg2+ and Cu2+ respectively, the 2-QDMF can be quenched by Hg2+, but not by Cu2+. Under the optimization conditions, the quenched photoluminescence (PL) intensities of multilayer films were almost linearly proportional to the concentration of Hg2+ in the range of 1.0 x 10(-8) to 1.0 x 10(-6) mol L-1 and the detection limit was 4.5 x 10(-9) mol L-1. The proposed method is intuitional and convenient, which can be applied to the determination of trace Hg2+ in the artificial water sample with satisfactory results. (C) 2011 Elsevier B.V. All rights reserved.
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