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Formation of gold-coated magnetic nanoparticles using TiO2 as a bridging material

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Abstract

TiO2 nanoparticles with embedded magnetite were suspended in aqueous HAuCl4 and ultraviolet irradiated to photodeposit gold on the surface. The degree of gold coating and the wavelength of absorbance could be controlled by adjusting [HAuCl4]. Absorbance maxima were between 540-590 nm. Particles exhibited superparamagnetic properties (blocking temperature ~170 K) whether or not coated with gold. These particles have potential applications as drug delivery agents, magnetic imaging contrast agents, and magnetically separatable photocatalysts with unique surface properties.

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Authors and Affiliations

  1. Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, New Orleans, Louisiana, 70148, USA

    Brittany L. Oliva, Anindya Pradhan, Daniela Caruntu, Charles J. O’Connor & Matthew A. Tarr

Authors
  1. Brittany L. Oliva
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  2. Anindya Pradhan
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  3. Daniela Caruntu
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  4. Charles J. O’Connor
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  5. Matthew A. Tarr
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Correspondence to Matthew A. Tarr.

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Oliva, B.L., Pradhan, A., Caruntu, D. et al. Formation of gold-coated magnetic nanoparticles using TiO2 as a bridging material. Journal of Materials Research 21, 1312–1316 (2006). https://doi.org/10.1557/jmr.2006.0163

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  • DOI: https://doi.org/10.1557/jmr.2006.0163

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