title: Recyclable fluorescent gold nanocluster membrane for visual sensing of copper(II) ion in aqueous solution.
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.
authors.affiliation: MOE Key Laboratory of Analysis and Detection Technology for Food Safety, and Department of Chemistry, Fuzhou Univiersity, Fujian 350108, China.
authors.forename: Zhijin
authors.initials: Z
authors.lastname: Lin
authors.forename: Fenqiang
authors.initials: F
authors.lastname: Luo
authors.forename: Tongqing
authors.initials: T
authors.lastname: Dong
authors.forename: Liyan
authors.initials: L
authors.lastname: Zheng
authors.forename: Yaxian
authors.initials: Y
authors.lastname: Wang
authors.forename: Yuwu
authors.initials: Y
authors.lastname: Chi
authors.forename: Guonan
authors.initials: G
authors.lastname: Chen
mesh_terms: D000818:Animals; D002417:Cattle; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D055767:Immobilized Proteins / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D055767:Immobilized Proteins; D007477:Ions; D008567:Membranes, Artificial; D014867:Water; D012710:Serum Albumin, Bovine; D006046:Gold; D003300:Copper