期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 113, 期 27, 页码 11861-11867出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp902061v
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- CFI
- Government of Ontario
The reduction of HAuCl4 and AgNO3 in aqueous surfactant solutions by 2-hydroxy-2-propyl radical generated by the photochemical cleavage of 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methyl-1-propane-1-one, commercialized as Irgacure-2959 (I-2959), produces Au-Ag bimetallic nanoparticles with different composition, and architecture,, alloys, and core-shells. The nanoparticle architecture depends on the surfactant employed. The use of hexadecyltrimethylammonium chloride (CTAC) produces Au(core)-Ag(shell) nanoparticles, as expected on the basis of the redox properties of the two metals, whereas when the surfactant is sodium dodecyl sulfate (SDS), it promotes the formation of Au-Ag alloy nanoparticles; the effect is attributed to silver's Coulombic advantage that compensates for the fact that gold is a more noble metal. Both structures are characterized by UV-vis spectroscopy, transmission electron microscopy (TEM) and high-resolution transmission spectroscopy (HR-TEM).
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