Growth and stabilization of silver nanoparticles on carbon dots and sensing application

Carbon dots (C-dots) have been proven to show the capability for direct reduction of Ag(+) to elemental silver (Ag(0)) without additional reducing agent or external photoirradiation by incubating Ag(+) with C-dots for 5 min in a water bath at 50 °C. Silver nanoparticles (Ag-NPs) are simultaneously f...

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Bibliographic Details
Published in:Langmuir Vol. 29; no. 52; p. 16135
Main Authors: Shen, Liming, Chen, Meiling, Hu, Linlin, Chen, Xuwei, Wang, Jianhua
Format: Journal Article
Language:English
Published: United States 31.12.2013
Subjects:
Biosensing Techniques - instrumentation
Carbon - chemistry
Catalysis
Fluorescence
Metal Nanoparticles - chemistry
Reducing Agents - chemistry
Silver - chemistry
Spectroscopy, Fourier Transform Infrared
ISSN:1520-5827, 1520-5827
Online Access:Get more information
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Summary:Carbon dots (C-dots) have been proven to show the capability for direct reduction of Ag(+) to elemental silver (Ag(0)) without additional reducing agent or external photoirradiation by incubating Ag(+) with C-dots for 5 min in a water bath at 50 °C. Silver nanoparticles (Ag-NPs) are simultaneously formed with an average size of 3.1 ± 1.5 nm and grew on carbon dots. This process involves the oxidation of amine or phenol hydroxyl groups on the aromatic ring of C-dots. Meanwhile C-dots protect and stabilize the Ag-NPs from aggregation in aqueous medium; that is, the Ag-NPs are stable at least for 45 days in aqueous medium. The formed Ag-NPs cause significant resonance light scattering (RLS), which correlates closely with the concentration of silver cation, and this facilitates quantitative detection of silver in aqueous medium.
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ISSN:1520-5827
1520-5827
DOI:10.1021/la404270w