Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 411, Issue 24, Pages 6419-6426Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-019-02020-9
Keywords
Amine-functionalized silicon nanoparticles; Cu2+ detection; Fluorescence quenching effect; Environment monitoring
Funding
- National Natural Science Foundation of China [21475106]
- Fundamental Research Funds for the Central Universities [XDJK2016A010, XDJK2018B004]
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies [cstc2011pt]
- Chongqing Engineering Research Center for Micro-Nano Biomedical Materials and Devices, Southwest University, China
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Amine-functionalized silicon nanoparticles (A-SiNPs) with intense green fluorescence and photostability are synthesized via a one-step, low-cost hydrothermal method under mild conditions using 3-aminopropyl triethoxysilane (APTES) as a silicon source and L-ascorbic acid (AA) as a reducing reagent. The amine-rich surface not only improves water dispersability and stability of the A-SiNPs but also offers a specific copper(II) ion (Cu2+) coordination capability. The as-prepared A-SiNPs can be directly employed for Cu2+ detection in turn-off mode, resulting from Cu2+ coordination-induced fluorescence quenching effect. Under optimal conditions, Cu2+ detection was accomplished with a linear range from 1 to 500 mu M and a limit of detection (LOD) at 0.1 mu M, which was much lower than the maximum level (similar to 20 mu M) of Cu2+ in drinking water permitted by the US Environmental Protection Agency (EPA). In addition, the A-SiNPs were successfully used to detect Cu2+ in spiked river water, demonstrating its good selectivity and potential application for analysis of surface water samples.
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