Recyclable fluorescent gold nanocluster membrane for visual sensing of copper(II) ion in aqueous solution.

TitleRecyclable fluorescent gold nanocluster membrane for visual sensing of copper(II) ion in aqueous solution.
Publication TypeJournal Article
Year of Publication2012
AuthorsLin, Z, Luo, F, Dong, T, Zheng, L, Wang, Y, Chi, Y, Chen, G
JournalAnalyst
Volume137
Issue10
Pagination2394-9
Date Published2012 May 21
ISSN1364-5528
KeywordsAnimals, Cattle, Copper, Fluorescent Dyes, Gold, Hydrogen-Ion Concentration, Immobilized Proteins, Ions, Membranes, Artificial, Metal Nanoparticles, Serum Albumin, Bovine, Ultraviolet Rays, Water
Abstract

Recently, metal-selective fluorescent chemosensors have attracted intense attention for their simple and real-time tracking of metal ions in environmental samples. However, most of the existing fluorescent sensors are one-off sensors and thus suffer from large amount of reagent consumption, significant experimental cost and raising the risk of environmental pollution. In this paper, we developed a green (low reagent consumption, low-toxicity reagent use), recyclable, and visual sensor for Cu(2+) in aqueous solution by using a fluorescent gold nanoclusters membrane (FGM) as the sensing unit, basing on our findings on gold nanoclusters (Au NCs) that the bovine serum albumin (BSA)-coated Au NCs exhibit excellent membrane-forming ability under the isoelectric point of BSA, and thus enable us to obtain a new type of sensing membrane (i.e. FGM) by denaturing Au NCs; the fluorescence of FGM can be significantly quenched by Cu(2+) ion, and the quenched fluorescence can be totally recovered by histidine; the as-prepared FGM is very stable and recyclable, which makes it an ideal sensing material.

DOI10.1039/c2an35068h
Alternate JournalAnalyst
PubMed ID22489283