title: Au25(SG)18 as a fluorescent iodide sensor.
abstract: The recently emerging gold nanoclusters (GNC) are of major importance for both basic science studies and practical applications. Based on its surface-induced fluorescence properties, we investigated the potential use of Au(25)(SG)(18) (GSH: glutathione) as a fluorescent iodide sensor. The current detection limit of 400 nM, which can possibly be further enhanced by optimizing the conditions, and excellent selectivity among 12 types of anion (F(-), Cl(-), Br(-), I(-), NO(3)(-), ClO(4)(-), HCO(3)(-), IO(3)(-), SO(4)(2-), SO(3)(2-), CH(3)COO(-) and C(6)H(5)O(7)(3-)) make Au(25)(SG)(18) a good candidate for iodide sensing. Furthermore, our work has revealed the particular sensing mechanism, which was found to be affinity-induced ratiometric and enhanced fluorescence (abbreviated to AIREF), which has rarely been reported previously and may provide an alternative strategy for devising nanoparticle-based sensors.
authors.affiliation: Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China.
authors.forename: Man
authors.initials: M
authors.lastname: Wang
authors.forename: Zhikun
authors.initials: Z
authors.lastname: Wu
authors.forename: Jiao
authors.initials: J
authors.lastname: Yang
authors.forename: Guozhong
authors.initials: G
authors.lastname: Wang
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Wang
authors.forename: Weiping
authors.initials: W
authors.lastname: Cai
mesh_terms: D006046:Gold / Q000737:chemistry*; D007454:Iodides / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D007454:Iodides; D006046:Gold