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Issue 21, 2005

Magnetic and optical tunable microspheres with a magnetite/gold nanoparticle shell

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Abstract

Multifunctional core-shell microspheres consisting of a polystyrene 640 nm diameter core covered with a selectable number of layers of magnetite (12 nm) and silica-coated gold (15 nm) nanoparticles have been fabricated using the layer-by-layer (LbL) technique in aqueous solution. By varying the shell thickness and layer composition the magnetic and optical properties and the diameter of the colloids can be controlled independently. Optical spectra of the core-shell colloidal microspheres show a well-resolved Au surface plasmon peak in the visible which red-shifts with the number of adsorbed Au nanoparticle layers. The magnetic moment per sphere increases nearly linearly with the number of adsorbed magnetite nanoparticle layers, and the spheres can be assembled into chains of up to 1 mm length by deposition in a magnetic field.

Graphical abstract: Magnetic and optical tunable microspheres with a magnetite/gold nanoparticle shell

Article information


Submitted
09 Feb 2005
Accepted
30 Mar 2005
First published
13 Apr 2005

J. Mater. Chem., 2005,15, 2095-2098
Article type
Paper

Magnetic and optical tunable microspheres with a magnetite/gold nanoparticle shell

M. Spasova, V. Salgueiriño-Maceira, A. Schlachter, M. Hilgendorff, M. Giersig, L. M. Liz-Marzán and M. Farle, J. Mater. Chem., 2005, 15, 2095 DOI: 10.1039/B502065D

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