Journal
ANALYST
Volume 139, Issue 7, Pages 1751-1755Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3an02097e
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Funding
- Natural Science Foundation of China [21345008]
- Fundamental Research Funds for the Central Universities
- Open Research Fund of State Key Laboratory of Bioelectronics, Southeast University
- Open Research Fund of State Key Laboratory of Analytical Chemistry for Life Science [SKLACLS1211]
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This work presents the enhanced electrochemiluminescence (ECL) of a newly prepared nanosilver-carbon nanodot (Ag-C-dot) composite and its application for the sensitive detection of sulfide (S2-) ions. The Ag-C-dot composite was easily prepared by adding silver nitrate into C-dot colloids through an alkaline reduction. The obtained Ag-C-dots were characterized by UV-vis spectra, fluorescence spectra and transmission electron microscopy. The electrochemical and ECL behaviors of the Ag-C-dot composite were investigated by cyclic voltammetry. Moreover, a simple label-free method to detect S2- ions with a high selectivity and sensitivity has been developed based on the ECL of the Ag-C-dot composite in aqueous media. The sensing mechanism could be due to the strong and specific interaction between the S2- ions and the Ag atoms/ions on the surface of the Ag-C-dot composite, which dramatically affects the resulting ECL of the Ag-C-dot composite. The linear response to detect S2- ions ranges from 0.05 to 100 mu M with a detection limit of 0.027 mu M (similar to 1 ppb). This work indicates that the Ag-C-dot nanocomposite possesses potential applications for environment sensing.
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