Piezoelectric technology, which converts mechanical energy into electrical energy, has recently attracted drawn considerable attention in the industry. Among the many kinds of piezoelectric materials, BaTiO3 nanotube arrays, which have outstanding uniformity and anisotropic orientation compared to nanowire-based arrays, can be fabricated using a simple synthesis process. In this study, we developed a flexible piezoelectric energy harvester (f-PEH) based on a composite film with PVDF-coated BaTiO3 nanotube arrays through sequential anodization and hydrothermal synthesis processes. The f-PEH fabricated using the piezoelectric composite film exhibited excellent piezoelectric performance and high flexibility compared to the previously reported BaTiO3 nanotube array-based energy harvester. These results demonstrate the possibility for widely application with high performance by our advanced f-PEH technique based on BaTiO3 nanotube arrays.

1. Introduction
2. Experimental
    2.1 BaTiO3 나노튜브 어레이 기반 필름 제작
    2.2 BaTiO3 나노튜브 어레이 필름 기반의 플렉서블 압전에너지 하베스터 제작
    2.3 플렉서블 압전 에너지 하베스터의 압전 성능 평가
3. Results and Discussion
4. Conclusion
Acknowledgement

• 윤서영(경북대학교 신소재공학부 금속신소재공학전공) | Seo Young Yoon (School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 김철민(경북대학교 신소재공학부 금속신소재공학전공) | Cheol Min Kim (School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 배빛나(경북대학교 신소재공학부 금속신소재공학전공) | Bitna Bae (School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 나유진(경북대학교 신소재공학부 금속신소재공학전공) | Yujin Na (School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 장학수(경북대학교 신소재공학부 금속신소재공학전공) | Haksu Jang (School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea)
• 박귀일(경북대학교 신소재공학부 금속신소재공학전공) | Kwi-Il Park (School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea) Corresponding author