Abstract
This study describes the surface modification of porous Vycor glass® (PVG®) with ionic species based on 1-methyl-imidazolium groups, and the posterior utilization of the functional porous substrate to synthesize supported gold nanoparticles (Au NPs). The functionalization degree (amount of imidazolium groups per gram of PVG®) was successfully controlled by the concentration of the imidazolium-based alkoxysilane in the reaction media. The ion-exchange properties of the functional groups allowed an effective and homogeneous upload of AuCl4 − throughout the monolithic PVG® structure, with subsequent conversion to Au NPs by thermal treatment at 823 K, which also eliminated the organic groups chemically bonded to the surface. The amount of adsorbed AuCl4 − ions was shown to have influence on loading of the Au NPs while no size variation is observed, indicating that the porous environment of PVG® acts as a nanoreactor where the particles are formed in the confined space.
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Acknowledgments
JPVD, MS, CMM, and LPC are indebted to CNPq and CAPES for fellowships. IOM, FAS and YG are indebted to CNPq and FAPESP for financial support and to Prof. C. H. Collins (IQ-UNICAMP, Brazil) for English revision. Contributions from LNNano (Brazilian Nanotechnology National Laboratory) for TEM imagens and the Multiuser Laboratory of Advanced Optical Spectroscopy (LMEOA/IQ-UNICAMP) for use of its equipment are also gratefully acknowledged. This work is a contribution from the National Institute of Science and Innovation in Complex Functional Materials (INOMAT).
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Special Issue Editors: Juan Manuel Rojo, Vasileios Koutsos
This article is part of the topical collection on Nanostructured Materials 2012
This paper is dedicated to Professor Fernando Galembeck on the occasion of this 70th anniversary.
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Strauss, M., Damasceno, J.P.V., Maroneze, C.M. et al. Exploring the functionalization ratio of mesoporous silica glass with imidazolium entities on the synthesis of supported gold nanoparticles. J Nanopart Res 15, 1441 (2013). https://doi.org/10.1007/s11051-013-1441-8
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DOI: https://doi.org/10.1007/s11051-013-1441-8