title: Ratiometric fluorescence detection of silver ions using thioflavin T-based organic/inorganic hybrid supraparticles.
abstract: In this work, we present a new type of functional organic/inorganic hybrid supraparticle that spontaneously assembles from silver ions (Ag(+)), iodide ions (I(-)) and thioflavin T (ThT) under aqueous solution conditions. ThT alone in aqueous solution was weakly fluorescent with an emission band at 494 nm, which was related to the monomer. However, in the above-mentioned hybrid supraparticle (i.e., ThT@AgI SP) structure, the ThT monomer can form a dimer with a new emission band. The new band shifted to 546 nm and the emission intensity increased. We further present a facile strategy of reversible fluorescence switching of ThT by a simple cation (Ag(+)) and anions (I(-) and S(2-)), which can be employed for the ratiometric fluorescence detection of Ag(+) with high sensitivity and selectivity. The linear range of detecting Ag(+) was from 100 nM to 10 μM, with a limit of detection as low as approximately 50 nM. Moreover, it can be successfully applied for the operation of a logic gate system and to the sensing of Ag(+) in real water samples.
authors.affiliation: School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P. R. China. mzhang@chem.ecnu.edu.cn gyshi@chem.ecnu.edu.cn.
authors.forename: Yan-Yun
authors.initials: YY
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Ling-Fei
authors.initials: LF
authors.lastname: Lu
authors.forename: Anwei
authors.initials: A
authors.lastname: Zhu
authors.forename: Fei
authors.initials: F
authors.lastname: Xia
authors.forename: Tianshu
authors.initials: T
authors.lastname: Zhou
authors.forename: Guoyue
authors.initials: G
authors.lastname: Shi
mesh_terms: D000838:Anions / Q000737:chemistry; D052160:Benzothiazoles; D002412:Cations / Q000737:chemistry; D007454:Iodides / Q000032:analysis; D053758:Nanoparticles / Q000737:chemistry*; D012834:Silver / Q000032:analysis*; D013050:Spectrometry, Fluorescence; D013844:Thiazoles / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000838:Anions; D052160:Benzothiazoles; D002412:Cations; D007454:Iodides; D013844:Thiazoles; D014867:Water; C009462:thioflavin T; D012834:Silver