INOR 543 |
| We report the generation of crystallographically oriented metal oxide coatings by solution-based, surfactant-directed growth even on non-crystalline substrates, thereby extending classical epitaxy. Dense films or coatings with highly ordered mesopores of various oxides (MoO3, Nb2O5, etc.) are obtained by dip-coating of solutions containing metal salts and certain block copolymer templates, followed by straightforward heat-treatment inducing oriented nucleation from the substrate. A systematic study using electron microscopy and XRD showed that this general, facile methodology is successful for oxides with highly anisotropic, electronically polarizable unit cells, and attributable to the interaction with adhered surfactants during nucleation (soft-epitaxy). The procedure is compatible with surfactant-directed self-assembly using special block copolymer templates poly(ethylene-co-butylene)-b-poly(ethylene oxide), providing ordered mesoporous films with the nanocrystals being crystallographically oriented in the pore walls with respect to the substrate. We anticipate this approach to provide the basis for the generation of such layers of more complex metal oxides like perovskites. |
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Nanoscience: Synthesis
9:00 AM-12:00 PM, Tuesday, 12 September 2006 Moscone Center -- Room 309, Oral
Division of Inorganic Chemistry |