Recyclable fluorescent gold nanocluster membrane for visual sensing of copper(II) ion in aqueous solution.
|Title||Recyclable fluorescent gold nanocluster membrane for visual sensing of copper(II) ion in aqueous solution.|
|Publication Type||Journal Article|
|Year of Publication||2012|
|Authors||Lin, Z, Luo, F, Dong, T, Zheng, L, Wang, Y, Chi, Y, Chen, G|
|Date Published||2012 May 21|
|Keywords||Animals, Cattle, Copper, Fluorescent Dyes, Gold, Hydrogen-Ion Concentration, Immobilized Proteins, Ions, Membranes, Artificial, Metal Nanoparticles, Serum Albumin, Bovine, Ultraviolet Rays, Water|
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.