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Fluorescent carbon quantum dot hydrogels for direct determination of silver ions

Cayuela, Angelina; Soriano, M. Laura; Kennedy, Stuart R.; Steed, J.W.; Valcárcel, M.

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Authors

Angelina Cayuela

M. Laura Soriano

Stuart R. Kennedy

M. Valcárcel



Abstract

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 µg mL−1, respectively, being applied in river water samples.

Citation

Cayuela, A., Soriano, M. L., Kennedy, S. R., Steed, J., & Valcárcel, M. (2016). Fluorescent carbon quantum dot hydrogels for direct determination of silver ions. Talanta, 151, 100-105. https://doi.org/10.1016/j.talanta.2016.01.029

Journal Article Type Article
Acceptance Date Jan 14, 2016
Online Publication Date Jan 15, 2016
Publication Date May 1, 2016
Deposit Date Apr 13, 2016
Publicly Available Date Mar 29, 2024
Journal Talanta
Print ISSN 0039-9140
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 151
Pages 100-105
DOI https://doi.org/10.1016/j.talanta.2016.01.029

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