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Template-assistant synthesis of gold nanoparticles with mesoporous silica thin films

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6 Author(s)
Jingyue Fang ; Sch. of Sci., Nat. Univ. of Defense Technol., Changsha, China ; Shiqiao Qin ; Xueao Zhang ; Guang Wang
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Three kinds of amino-functional mesoporous silica thin films (AF-MSTFs) have been directly synthesised by the sol-gel dip coating. The Fourier transform infrared spectra show that the amino groups are introduced into the nanopores of AF-MSTFs successfully by co-condensation technology. The X-ray diffraction (XRD) and transmission electron microscope (TEM) characterisations find that the AF-MSTFs prepared by different surfactants have highly ordered mesostructures with different nanopore sizes and morphologies. By using AF-MSTFs as templates, associated with neutralisation reaction and hydrogen reduction, gold nanoparticles (GNPs) are formed well within the mesostructures with a narrow size distribution, which is verified by the observation of XRD, TEM and energy-dispersive X-ray analyses. Ultraviolet-visible spectra of the nanocomposites are additional evidence of the existence of GNPs. What is more, they imply that the size effect of GNPs and the structure variation of AF-MSTFs can modulate the optical properties of the nanocomposites.

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Micro & Nano Letters, IET  (Volume:6 ,  Issue: 11 )