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The nanoscale description of acid penetration to the gold colloids encapsulated in silica sol–gel matrix

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Abstract

Various sizes of gold nano colloidal particles ranging from 5 nm to 100 nm of size were encapsulated in a silica based sol–gel, and these surfaces were exposed to a pH 1 acid solution. This enabled us to observe the process of solvent intrusion and interaction with gold colloids by the absorption spectrum as a function of time. The rate was analyzed by a single exponential analytical function, and the maximum rate was found for gold colloid of 15 nm size. The least acid interaction and colour change was observed for the size of 60 nm. It was speculated that the surface of these gold colloids were homogeneously covered by the sodium tetra-borate buffer which insulated silica gel layer, thus avoiding direct contact of the acid with the surface of the gold colloid. This study confirmed that the nano scale dopant size affects the rate of solvent penetration into a sol–gel cavity.

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Acknowledgements

This work is supported by the National Science Foundation under grant number NSF-NER 0508240. A generous contribution from The SUNY-Geneseo Foundation at an initial stage of this project is greatly acknowledged. Nitrogen porosimetry measurements were kindly supported by Professor Hong Yang of the University of Rochester. We are grateful for valuable suggestions to this manuscript from Professor David Geiger at SUNY-Geneseo.

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Author notes

  1. Jeffrey R. Swana

    Present address: Worcester Polytech Institute, 100 Institute Road, Worcester, MA, 01609, USA

  2. Paul Kogan

    Present address: Down State Health Sciences Center, State University of New York, Brooklyn, NY, 11203, USA

Authors and Affiliations

  1. Department of Chemistry, State University of New York, Geneseo, NY, 14454, USA

    Kazushige Yokoyama, Jeffrey R. Swana, Tonya M. Gilbert, Duo D. Chen, Liwen Chen & Paul Kogan

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  1. Kazushige Yokoyama
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Correspondence to Kazushige Yokoyama.

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Yokoyama, K., Swana, J.R., Gilbert, T.M. et al. The nanoscale description of acid penetration to the gold colloids encapsulated in silica sol–gel matrix. J Sol-Gel Sci Technol 50, 48–57 (2009). https://doi.org/10.1007/s10971-009-1904-7

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  • DOI: https://doi.org/10.1007/s10971-009-1904-7

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