Layer-by-layer fabrication of hierarchical structures in sol-gel templated thin titania films

The fabrication of titania nanostructures with hierarchical order of different structural levels is investigated. The nanostructures are prepared with a diblock‐copolymer assisted sol–gel process. By iterative spin‐coating of the solution onto silicon substrates a thin polymer‐nanocomposite film is...

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Bibliographic Details
Published in:Physica status solidi. PSS-RRL. Rapid research letters 2009-05, Vol.3 (4), p.118-120
Main Authors: Perlich, J., Memesa, M., Diethert, A., Metwalli, E., Wang, W., Roth, S. V., Timmann, A., Gutmann, J. S., Müller-Buschbaum, P.
Format: Article
Language:English
Subjects:
61.05.cf
68.37.Hk
81.07.−b
81.15.Lm
81.20.Fw
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Summary:The fabrication of titania nanostructures with hierarchical order of different structural levels is investigated. The nanostructures are prepared with a diblock‐copolymer assisted sol–gel process. By iterative spin‐coating of the solution onto silicon substrates a thin polymer‐nanocomposite film is deposited and transformed to purely anatase titania nanostructures via calcination. In total, this procedure is repeated three times on top of the substrate. The approach is monitored with grazing incidence small angle X‐ray scattering after each fabrication step. With scanning electron microscopy the final hierarchical structure is imaged. From the characterization different structural levels are clearly identified. Preparation of small titania nanogranules on top of much larger sol–gel templated titania granules. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) The authors apply a layer‐by‐layer spin‐coating approach for the fabrication of hierarchical titania structures with multiple structural levels. The approach is monitored with grazing incidence small angle X‐ray scattering after each fabrication step. A layer of superimposing hierarchical morphologies is obtained. Once prepared, structural levels are preserved throughout the complete three‐step process. The results emphasize the usability of such an approach for the superposition of even completely different morphologies.
ISSN:1862-6254
1862-6270
DOI:10.1002/pssr.200903065