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Hf 도핑된 BaTiO<sub>3</sub> 나노입자 기반의 플렉서블 압전 소자 개발 및 특성평가
장학수 ( Haksu Jang ),박현준 ( Hyeon Jun Park ),김광현 ( Gwang Hyeon Kim ),이경자 ( Gyoung-ja Lee ),지재훈 ( Jae-hoon Ji ),이동훈 ( Donghun Lee ),정영화 ( Young Hwa Jung ),이민구 ( Min-ku Lee ),백창연 ( Changyeon Baek ),박귀일 ( K 한국센서학회 2024 센서학회지 Vol.33 No.1
Energy harvesting technology that converts the wasted energy resources into electrical energy is emerging as a semipermanent power source for self-powered electronics and wireless low-power sensor systems. Among the various energy conversion techniques, flexible piezoelectric energy harvesters (f-PEHs), using materials with piezoelectric effects, have attracted significant interest because they can harvest a small mechanical energy into electrical signals without constraints of time and space in various environments. In this study, we used a flexible piezoelectric composite film fabricated by dispersing BaHf<sub>x</sub>Ti<sub>(1- x)</sub>O<sub>3</sub> (x = 0, 0.01, 0.05, 0.1) piezoelectric powders inside a polymeric matrix to facilitate f-PEHs. The fabricated f-PEH with optimal Hf contents (x = 0.05) generated a maximum output voltage of 0.95 V and current signal of 130 nA with stable electrical/ mechanical disabilities under periodically bending deformations. In addition, we demonstrated a cantilever-type f-PEH and investigated its potential as a sensor by characterizing the output performance under mechanical vibrations at various frequencies. This study provides the breakthrough for realizing self-powered energy harvesting and sensing systems by adopting the lead-free piezoelectric composites under vibrational environments.