Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

TALANTA

卷:151

Article

Cayuela, A.¹  Soriano, M. L.¹  Kennedy, S. R.²  Steed, J. W.²  Valcarcel, M.¹ 

[1] Univ Cordoba, Dept Analyt Chem, Marie Curie Bldg,Campus Rabanales, E-14071 Cordoba, Spain

[2] Univ Durham, Dept Chem, South Rd, Durham DH1 3LE, England

关键词: Carbon Quantum Dots;    Silver;    Sensor;    Supramolecular gel;    Urea;    Fluorescence;   

DOI  :  10.1016/j.talanta.2016.01.029

来源: Elsevier

【 摘 要 】

The paper reports for the first time the direct determination of silver ion (Ag+) using luminescent Carbon Quantum Dot hydrogels (CQDGs). Carbon Quantum Dots (CQDs) with different superficial moieties (passivate-CQDs with carboxylic groups, thiol-CQDs and amine-CQDs) were used to prepare hybrid gels using a low molecular weight hydrogelator (LMWG). The use of the gels results in considerable fluorescence enhancement and also markedly influences selectivity. The most selective CQDG system for Ag+ ion detection proved to be those containing carboxylic groups onto their surface. The selectivity towards Ag+ ions is possibly due to its flexible coordination sphere compared with other metal ions. This fluorescent sensing platform is based on the strong Ag-O interaction which can quench the photoluminescence of passivate-CQDs (p-CQDs) through charge transfer. The limit of detection (LOD) and quantification (LOQ) of the proposed method were 0.55 and 1.83 mu g mL(-1), respectively, being applied in river water samples. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free