Development of New Fabrication Technology Using Self-Assembly Behaviors of Single-Crystalline Dielectric Nanocubes

Abstract

Dielectric single-crystalline nanocube 3D-assembly has a lot of unique properties such as packing perfection, high orientation and interfacial nano-architecture of the supracrystal, and it attracts attention to utilize in the next generation electronic devices. This review reports about fabrication and enhanced dielectric properties of BaTiO₃ nanocube 3D assembly. BaTiO₃-based nanocubes were synthesized by hydrothermal method with aqueous metal compounds and surfactants. 15 nm sized single-crystalline nanocubes were assembled by capillary-force-assisted self-assembly method through the dip-coating process. The orderd nanostructure of BaTiO₃ nanocubes has an enhanced dielelctric constant above 4000 with low loss. The origin of this enhanced property was considered to be distortion induced by the interfaces between the nanocubes with a small tilted angle. It is revealed that the size and shape distribution is the most important factor to fabricate the nanocube 3D nano-architecture with high ordering.