Journal
NANOTECHNOLOGY
Volume 26, Issue 24, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/26/24/244001
Keywords
oxide nanosheets; nanoarchitectonics; artificial superlattice; layer-by-layer assembly; ferroelectricity
Funding
- World Premier International Research Center Initiative on Materials Nanoarchitronics, MEXT, Japan
- MEXT, Japan
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Control over the emergence of ferroelectric order remains a fundamental challenge for the rational design of artificial materials with novel properties. Here we report a new strategy for artificial design of layered perovskite ferroelectrics by using oxide nanosheets (high-k dielectric Ca2Nb3O10 and insulating Ti0.87O2) as a building block. We approached the preparation of superlattice films by a layer-by-layer assembly involving Langmuir-Blodgett deposition. The artificially fabricated (Ti0.87O2/Ca2Nb3O10)(2)(Ti0.87O2) superlattices are structurally unique, which is not feasible to create in the bulk form. By such an artificial structuring, we found that (Ti0.87O2/Ca2Nb3O10)(2)(Ti0.87O2) superlattices possess a new form of interface coupling, which gives rise to ferroelectricity with a good fatigue-free characteristic. Considering the flexibility of self-assembled nanosheet interfaces, this technique provides a route to synthesize a new kind of layered ferroelectric oxides.
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