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

Published online by Cambridge University Press:  01 May 2006

Brittany L. Oliva ,
Anindya Pradhan ,
Daniela Caruntu ,
Charles J. O'Connor  and
Matthew A. Tarr
Brittany L. Oliva
Affiliation:
Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148
Anindya Pradhan
Affiliation:
Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148
Daniela Caruntu
Affiliation:
Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148
Charles J. O'Connor
Affiliation:
Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148
Matthew A. Tarr*
Affiliation:
Advanced Materials Research Institute and Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148
*
a) Address all correspondence to this author. e-mail: mtarr@uno.edu
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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.

Keywords

MagneticNanoscalePhotochemical
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1312 - 1316
Copyright
Copyright © Materials Research Society 2006

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