Morphology and photoluminescence study of titania nanoparticles |
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Authors: | Mine Memesa Sebastian Lenz Sebastian G J Emmerling Sebastian Nett Jan Perlich Peter Müller-Buschbaum Jochen S Gutmann |
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Institution: | 1.Max Planck Institute for Polymer Research,Mainz,Germany;2.Deutsches Textilforschungszentrum Nord-West e.V., Institut an der Universit?t Duisburg-Essen,Krefeld,Germany;3.Lehrstuhl für Funktionelle Materialien,Technische Universit?t München,Garching,Germany;4.Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology,University of Twente,AE Enschede,the Netherlands;5.HASYLAB at DESY,Hamburg,Germany |
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Abstract: | Titania nanoparticles are prepared by sol–gel chemistry with a poly(ethylene oxide) methyl ether methacrylate-block-poly(dimethylsiloxane)-block-poly(ethylene oxide) methyl ether methacrylate triblock copolymer acting as the templating agent. The sol–gel components—hydrochloric
acid, titanium tetraisopropoxide, and triblock copolymer—are varied to investigate their effect on the resulting titania morphology.
An increased titania precursor or polymer content yields smaller primary titania structures. Microbeam grazing incidence small-angle
X-ray scattering measurements, which are analyzed with a unified fit model, reveal information about the titania structure
sizes. These small structures could not be observed via the used microscopy techniques. The interplay among the sol–gel components
via our triblock copolymer results in different sized titania nanoparticles with higher packing densities. Smaller sized titania
particles, (∼13–20 nm in diameter) in the range of exciton diffusion length, are formed by 2% by weight polymer and show good
crystallinity with less surface defects and high oxygen vacancies. |
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