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Published in: Cellulose 7/2022

02-04-2022 | Original Research

Highly sensitive and selective fluorescent sensor for Ag+ detection using β-cyclodextrin/chitosan polymer-coated S QDs based on an aggregation-induced quenching mechanism

Authors: Shan Wang, Huan Wang, Jianshe Yue, Yi Lu, Tian Jia, Jie Chen

Published in: Cellulose | Issue 7/2022

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Abstract

A novel sensor for the sensitive and selective detection of Ag+ based on poly(β-cyclodextrin/chitosan (CTSCD) with H-bonded sulphur quantum dots (QDs) was synthesized by self-assembly. S QDs on the CTSCD chain can coordinate with transition metal ions due to surface electronegativity. The distance between S QDs and Ag+ can form bridge S–Ag+–S bonds with Ag+. These are associated with noncovalent bonds to form Ag+-based S QD/CTSCD nanocomposite aggregates, leading to fluorescence aggregation-induced quenching. By utilizing S QD/CTSCD as a sensor to detect Ag+, a good linear relationship in the range of 1.0 × 10–5 to 5.5 × 10 –5 mol/L (R2 = 0.9992) was obtained. Moreover, the S QD/CTSCD nanocomposite was successfully utilized to monitor Ag+ in river water with satisfactory performance. This work offers a new paradigm for the design of novel composite sensors with good sensitivity and selectivity.

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Metadata
Title
Highly sensitive and selective fluorescent sensor for Ag+ detection using β-cyclodextrin/chitosan polymer-coated S QDs based on an aggregation-induced quenching mechanism
Authors
Shan Wang
Huan Wang
Jianshe Yue
Yi Lu
Tian Jia
Jie Chen
Publication date
02-04-2022
Publisher
Springer Netherlands
Published in
Cellulose / Issue 7/2022
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-022-04524-7

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