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Authors Wang, M. ; Zhang, L.
Title Precipitation of multilayered core-shell TiO2 composite nanoparticles onto polymer layers
Date 31.12.2001
Number 43723
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.
Publisher Journal of Materials Research
Wikidata
Citation Journal of Materials Research 16 (2001) 765-773
DOI https://doi.org/10.1557/JMR.2001.0105
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