title: Growth and stabilization of silver nanoparticles on carbon dots and sensing application.
abstract: 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.
authors.affiliation: Research Center for Analytical Sciences, College of Sciences, Northeastern University , Box 332, Shenyang 110819, China.
authors.forename: Liming
authors.initials: L
authors.lastname: Shen
authors.forename: Meiling
authors.initials: M
authors.lastname: Chen
authors.forename: Linlin
authors.initials: L
authors.lastname: Hu
authors.forename: Xuwei
authors.initials: X
authors.lastname: Chen
authors.forename: Jianhua
authors.initials: J
authors.lastname: Wang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D005453:Fluorescence; D053768:Metal Nanoparticles / Q000737:chemistry*; D019163:Reducing Agents / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D019163:Reducing Agents; D012834:Silver; D002244:Carbon