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Preparation and absorption properties of polystyrene/Ag/TiO2 multiple coated colloids

Published online by Cambridge University Press:  01 April 2005

J.H. Zhang ,
S.Z. Wang ,
J.B. Liu ,
Z.L. Wang  and
N.B. Ming
J.H. Zhang*
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
S.Z. Wang
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
J.B. Liu
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
Z.L. Wang
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
N.B. Ming
Affiliation:
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
*
a) Address all correspondence to this author e-mail: [email protected]
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Abstract

We demonstrated a facile route based on the use of acetone and polyvinylpyrrolidone (PVP) to prepare polystyrene (PS)/Ag/TiO2 multilayered colloids with controllable shell thickness. In this route, PVP absorbed directly onto PS colloid surface, and the Ag seed shell composed of Ag nanoparticles was synthesized directly under the PVP shell by swelling the surface layer of the PS core. Because the PVP shell increased the affinity of the Ag shell to TiO2, the hydrolyzed titania particles could deposit directly onto the core to form the outer TiO2 shell. A seed growth technique and the controllable hydrolysis reaction of tetra-n-butyl titanate were developed to grow the shell thickness of Ag and TiO2, respectively. Studies of the absorption properties indicate that the optical properties of these multilayered composite colloids can be modified by changing the coating species and shell thickness.

Keywords

CoatingColloidalOptical properties
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 965 - 970
Copyright
Copyright © Materials Research Society 2005

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