Engineered Interfaces of Artificial Perovskite Oxide Superlattices via Nanosheet Deposition Process
- 4 November 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 4 (11) , 6673-6680
Abstract
Combining different materials into desired superlattice structures can produce new electronic states at the interface and the opportunity to create artificial materials with novel properties. Here we introduce a new, rather unexpected, and yet simple way to such a superlattice assembly of perovskite oxides: in the Dion−Jacobson phase, a model system of layered perovskites, high-quality bicolor perovskite superlattices (LaNb2O7)nL(Ca2Nb3O10)nC are successfully fabricated by a layer-by-layer assembly using two different perovskite nanosheets (LaNb2O7 and Ca2Nb3O10) as a building block. The artificially fabricated (LaNb2O7/Ca2Nb3O10) superlattices are structurally unique, which is not feasible to create in the bulk form. By such an artificial structuring, we found that (LaNb2O7/Ca2Nb3O10) superlattices possess a new form of interface coupling, which gives rise to ferroelectricity.Keywords
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