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Formation and Evolution of Body-Centered Orthorhombic Mesophase in TiO2 Thin Films

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A new mesophase orientation has been established in TiO2 thin films formed by self-assembling of a poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) triblock copolymer (Pluronic F127). They were then characterized by using scanning electron microscopy, transmission electron microscopy, small-angle X-ray scattering, and X-ray diffraction. This new mesophase was identified and indexed as a body-centered orthorhombic mesophase structure with the (001) plane parallel to the substrate. It may well originate from a body-centered tetragonal structure, orienting with the square base perpendicular to the substrate. The mesophase then underwent a uniaxial contraction in the direction normal to the substrate upon drying and thermal treatment. As a result, the in-plane parameters were preserved whereas the out-of-plane parameters were markedly reduced by heating.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore

Publication date: 01 June 2009

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