Artificial design for new ferroelectrics using nanosheet-architectonics concept

作者：Kim Yoon Hyun^*; Dong Lei; Osada Minoru; Li Bao Wen; Ebina Yasuo; Sasaki Takayoshi

来源：Nanotechnology, 2015, 26(24): 244001.

DOI：10.1088/0957-4484/26/24/244001

• oxide nanosheets
• nanoarchitectonics
• artificial superlattice
• layer-by-layer assembly
• ferroelectricity

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.

• 出版日期2015-6-19