Abstract
The Turkevich synthesis method of Au nanoparticles (AuNPs) was adopted for direct fabrication of SiO2@Au and TiO2@Au core-shell nanostructures. In this method, chloroauric acid was reduced with trisodium citrate in the presence of amine-functionalized silica or titania submicroparticles. Core-shells obtained in this way were compared to structures fabricated by mixing of Turkevich AuNPs with amine-functionalized silica or titania submicroparticles. It was found that by modification of reaction conditions of the first method, such as temperature and concentration of reagents, control over gold coverage on silicon dioxide particles has been achieved. Described method under certain conditions allows fabrication of semicontinuous gold films on the surface of silicon dioxide particles. To the best of our knowledge, this is the first report describing use of Turkevich method to direct fabrication of TiO2@Au core-shell nanostructures.
Highlights
IntroductionNanotechnology is one of the fastest growing fields in science and engineering
In recent years, nanotechnology is one of the fastest growing fields in science and engineering.One of the results of extremely rapid progress in this field is the discovery of the large number of functional materials in which at least one dimension is in the range of 1 to 100 nm
The core-shell nanostructures consisting of oxide core and noble metal shell is an interesting example of such hybrid nanostructures
Summary
Nanotechnology is one of the fastest growing fields in science and engineering. In studies reported by Zhang et al [31], gold salts were reduced directly on the surface of amino-functionalized silica particles (average diameter of 227 nm) and the silica particles decorated with gold particles (average diameter of 14 nm) at 100 °C by rapidly injected trisodium citrate In both cases rather non-uniform coverage with gold was achieved, the coverage was higher in case of reduction on silica particles decorated with gold nanoparticles. In studies of Zhang et al [33], gold shell was grown on the tris(2,2′-bipyridyl)ruthenium(II) chloride embedded amino-functionalized SiO2 particles (diameter ~70nm) In this method, reducing agent was added dropwise to mixture containing functionalized cores and gold salt. This method was for the first time applied to synthesis of TiO2@Au core-shell nanostructures
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