Artificial design for new ferroelectrics using nanosheet-architectonics concept. (27th May 2015)

• Record Type: Journal Article
• Authors: Kim, Yoon-Hyun; Dong, Lei; Osada, Minoru; Li, Bao-Wen; Ebina, Yasuo; Sasaki, Takayoshi
• Is Part Of: Nanotechnology. Volume 26:Number 24(2015)
• Publication Date: 2015-05-27
• Subjects: oxide nanosheets -- nanoarchitectonics -- artificial superlattice -- layer-by-layer assembly -- ferroelectricity; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/26/24/244001
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 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 Ca2 Nb3 O10 and insulating Ti0.87 O2 ) as a building block. We approached the preparation of superlattice films by a layer-by-layer assembly involving Langmuir–Blodgett deposition. The artificially fabricated (Ti0.87 O2 /Ca2 Nb3 O10 )2 (Ti0.87 O2 ) superlattices are structurally unique, which is not feasible to create in the bulk form. By such an artificial structuring, we found that (Ti0.87 O2 /Ca2 Nb3 O10 )2 (Ti0.87 O2 ) 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.