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 Ca<inf>2</inf>Nb<inf>3</inf>O<inf>10</inf> and insulating Ti<inf>0.87</inf>O<inf>2</inf>) as a building block. We approached the preparation of superlattice films by a layer-by-layer assembly involving Langmuir-Blodgett deposition. The artificially fabricated (Ti<inf>0.87</inf>O<inf>2</inf>/Ca<inf>2</inf>Nb<inf>3</inf>O<inf>10</inf>)<inf>2</inf>(Ti<inf>0.87</inf>O<inf>2</inf>) superlattices are structurally unique, which is not feasible to create in the bulk form. By such an artificial structuring, we found that (Ti<inf>0.87</inf>O<inf>2</inf>/Ca<inf>2</inf>Nb<inf>3</inf>O<inf>10</inf>)<inf>2</inf>(Ti<inf>0.87</inf>O<inf>2</inf>) 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.
Original language | English |
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Article number | 244001 |
Journal | Nanotechnology |
Volume | 26 |
Issue number | 24 |
DOIs | |
Publication status | Published - 2015 Jun 19 |
Keywords
- oxide nanosheets, nanoarchitectonics, artificial superlattice, layer-by-layer assembly ferroelectricity
ASJC Scopus subject areas
- Bioengineering
- Chemistry(all)
- Electrical and Electronic Engineering
- Mechanical Engineering
- Mechanics of Materials
- Materials Science(all)