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Mesoporous silica nanoparticles with tunable pore size for tailored gold nanoparticles

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Abstract

The aim of this paper was to verify a possible correlation between the pore-size of mesoporous silica nanoparticles (MSNs) and the sizes of gold nanoparticles (AuNPs) obtained by an impregnation of gold(III) chloride hydrate solution in the MSNs, followed by a specific thermal treatment. Mesoporous silica nanoparticles with tunable pore diameter were synthesized via a surfactant-assisted method. Tetraethoxysilane as silica precursor, cetyltrimethylammonium bromide (CTAB) as surfactant and toluene as swelling agent were used. By varying the CTAB–toluene molar ratio, the average dimension of the pores could be tuned from 2.8 to 5.5 nm. Successively, thiol groups were grafted on the surface of the MSNs. Finally, the thermal evolution of the gold salt, followed by “in situ” X-ray powder diffraction (XRPD) and thermogravimetric analysis (TGA), revealed an evident correlation among the degradation of the thiol groups, the pore dimension of the MSNs and the size of the AuNPs. The samples were characterized by means of nitrogen adsorption–desorption, transmission electron microscopy, small-angle X-ray scattering, XRPD “in situ” by synchrotron radiation, and “ex situ” by conventional techniques, diffuse reflectance infrared Fourier transform spectroscopy, and TGA.

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Acknowledgements

The authors thank Mr D. Cristofori for bare silica TEM images, Mr T. Finotto for the SAXS and XRPD measurements and Mr. N. Mazzucco for EDS analysis.

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  1. Department of Molecular Sciences and Nanosystems, Ca’ Foscari Università di Venezia, CSGI, via Torino 155/b, 30170, Venezia-Mestre, Italy

    G. Sponchia, R. Marin, I. Freris, M. Marchiori, E. Moretti, L. Storaro, P. Canton, A. Benedetti & P. Riello

  2. MCX Beamline, Elettra Sincrotrone Trieste, S.S.14-km 163.5, 34149, Basovizza, Trieste, Italy

    A. Lausi

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  1. G. Sponchia
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Sponchia, G., Marin, R., Freris, I. et al. Mesoporous silica nanoparticles with tunable pore size for tailored gold nanoparticles. J Nanopart Res 16, 2245 (2014). https://doi.org/10.1007/s11051-014-2245-1

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