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Issue 20, 2002
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Laser flash photolysis study of the photochemical formation of colloidal Ag nanoparticles in the presence of benzophenone

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Abstract

Sensitized photoreduction of Ag+ ions and subsequent formation of colloidal Ag nanoparticles take place when an aqueous solution of a mixture of AgClO4, sodium dodecylsulfate (SDS) and benzophenone (BP) is irradiated with near-UV light. In this study, the mechanism and kinetics of the reaction have been studied by means of nanosecond laser flash photolysis, time-resolved emission spectroscopy and also steady-state photolysis. Benzophenone ketyl radial (BPK) is formed by the hydrogen abstraction reaction of the benzophenone triplet (BPT) from SDS, which reduces Ag+ ions. It is found that the yield of colloidal Ag nanoparticle formation decreases remarkably with increasing concentration of Ag+ ions, indicating the efficient quenching process of BPT by Ag+ ions. Rate constants for the oxidation of BPK as well as the quenching of BPT by Ag+ ions in SDS micellar solution are considerably larger than those expected in the bulk solution, reflecting that Ag+ ions and BP molecules are concentrated in the SDS micelles. The rate of colloidal Ag nanoparticle formation, VAg, and BP photobleach, VBP, under steady-state irradiation with near-UV light (λ = 365 nm) were evaluated and the dependence of VAg and VBP on the concentration of Ag+ ions is interpreted quantitatively in terms of rate constants estimated by laser flash photolysis.

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Publication details

The article was received on 17 Jun 2002, accepted on 28 Aug 2002 and first published on 19 Sep 2002


Article type: Paper
DOI: 10.1039/B205829D
Citation: Phys. Chem. Chem. Phys., 2002,4, 5142-5147
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    Laser flash photolysis study of the photochemical formation of colloidal Ag nanoparticles in the presence of benzophenone

    N. Kometani, H. Doi, K. Asami and Y. Yonezawa, Phys. Chem. Chem. Phys., 2002, 4, 5142
    DOI: 10.1039/B205829D

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