Development of composite-type nanocube assemblies for next generation piezoelectric devices

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K18418
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties; Inorganic industrial materials
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Mimura Ken-ichi 国立研究開発法人産業技術総合研究所, 材料・化学領域, 主任研究員 (20709555)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 圧電材料 / ナノ結晶 / ナノキューブ / チタン酸バリウム / ヘテロ界面 / 水熱合成

Outline of Final Research Achievements

Novel cube-shaped nanocrystals of BaTiO3 (BT) surrounded by CaTiO3 (CT) were synthesized using a one-step hydrothermal reaction with surfactant and additives. The size distribution of the nanocubes (NCs) was narrow, with a peak of approximately 80 nm. The nanocubes had a core-shell configuration, such that the Pbnm structured CT shell was epitaxially grown on a BT core by sharing corresponding [001] directions. Piezoelectric hysteresis loops of BT/CT NCs were obtained by piezoresponse force microscopy. These core-shell nanocubes which are synthesized by one-pot hydrothermal method have a great potential to be one of the candidates for piezo-driven energy harvesting devices.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

これまで、ヘテロ界面が誘電特性や圧電特性を向上させる報告はあったが、合成方法が複雑であり、多段階の反応を必要とし、同時にナノ結晶の形状制御を達成した報告はない。本研究成果では、特殊な原料を用いることなく、1段階で粒子内部にヘテロ界面を導入すると同時に粒子形態の制御を初めて可能とし、ヘテロ界面による特性向上の傾向も得られた。これらの成果は高機能ナノ材料の量産化への一歩として大きな意義を有する。