Growth and Stabilization of Silver Nanoparticles on Carbon Dots and Sensing Application

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• 作者：Liming Shen ; Meiling Chen ; Linlin Hu ; Xuwei Chen ; Jianhua Wang
• 刊名：Langmuir
• 出版年：2013
• 出版时间：December 31, 2013
• 年：2013
• 卷：29
• 期：52
• 页码：16135-16140
• 全文大小：382K
• ISSN：1520-5827

文摘

Carbon dots (C-dots) have been proven to show the capability for direct reduction of Ag⁺ to elemental silver (Ag⁰) without additional reducing agent or external photoirradiation by incubating Ag⁺ with C-dots for 5 min in a water bath at 50 掳C. Silver nanoparticles (Ag-NPs) are simultaneously formed with an average size of 3.1 卤 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.