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| - Diblock Copolymer Templated Nanohybrid Thin Films of HighlyOrdered TiO2 Nanoparticle Arrays in PMMA Matrix
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| - Solvent modification enables successful use of poly(methylmethacrylate)-b-polyethylene oxide diblock copolymer as a template for synthesizing nanohybrid thin films containing highly ordered arrays of TiO2 nanoparticles. A significant enhancement in crystallinity of the TiO2 nanoarrays is achieved by the application of a post-hydrothermal treatment using high-pressure water vapor at 150 °C, leading to changes in both absorption and photoluminescence behavior.
- Solvent modification with a mixture of tetrahydrofuran and water in a proportional volume ratio of50% has been employed to enable poly(methylmethacrylate)-b-polyethylene oxide diblock copolymer tobe used as a template for preparing nanohybrid thin films containing highly ordered arrays of titaniumdioxide (TiO2) nanoparticles. With control of the processing parameters involved in the block copolymertemplating, nanoarrays consisting of nanocrystalline TiO2 particles were successfully assembled in thehexagonal-like or cubical-like hierarchical structures, as revealed by TEM studies. The phases and chemicalnature of the titania nanoparticles have been confirmed by Raman and XPS spectroscopies. A significantenhancement in nanocrystallinity of the TiO2 phase in the nanohybrid thin films was achieved by theapplication of an appropriate hydrothermal treatment in high-pressure water vapor at 150 °C. Thenanocrystallinity strongly affects the UV absorbance and photoluminescence emission of the nanohybridthin films.
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