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Precipitation of multilayered core–shell TiO2 composite nanoparticles onto polymer layers

Published online by Cambridge University Press:  26 November 2012

Mingtai Wang  and
Lide Zhang
Mingtai Wang*
Affiliation:
Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
Lide Zhang
Affiliation:
Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
*
a)Address all correspondence to this author. e-mail: wang@ipfdd.de
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Abstract

A composite film of titanium dioxide (TiO2) nanoparticles and hydrolyzed styrene–maleic anhydride alternating copolymer (HSMA) was obtained on a substrate when a TiCl4 solution was heated at 80 °C with a spin-cast thin HSMA film present in the solution. The composite film was characterized with x-ray photoelectron spectroscopy and transmission electron microscopy. Results revealed that TiO2 nanoparticles discretely dispersed on the polymer layer, and they were dominantly rutile phase, of a spherical shape and 18–20 nm in diameter. In contrast, mainly amorphous TiO2 powders were obtained from the identical TiCl4 solution by drying the solution with the absence of the HSMA film. The TiO2 nanoparticles deposited on the polymer layer were regarded to contain polymer chains, and a multilayered core–shell model was suggested for the formation of these composite nanoparticles. It is regarded that the core of a composite particle consisted of an anatase-phase TiO2 colloidal nanoparticle, while the shell layer was made of rutile-phase TiO2/polymer multilayers; the composite particles formed by a layer-by-layer self-assembly of TiO2 and polymer layers analogous to biomineralization, where the polymer promoted the crystallization of rutile-phase TiO2 when TiO2 deposited from solution.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 3 , March 2001 , pp. 765 - 773
Copyright
Copyright © Materials Research Society 2001

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