Hf 도핑된 BaTiO3 나노입자 기반의 플렉서블 압전 소자 개발 및 특성평가
Development and Characterization of Hafnium-Doped BaTiO3 Nanoparticle-Based Flexible Piezoelectric Devices
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초록
Energy harvesting technology that converts the wasted energy resources into electrical energy is emerging as a semipermanentpower source for self-powered electronics and wireless low-power sensor systems. Among the various energy conversiontechniques, flexible piezoelectric energy harvesters (f-PEHs), using materials with piezoelectric effects, have attractedsignificant interest because they can harvest a small mechanical energy into electrical signals without constraints of time andspace in various environments. In this study, we used a flexible piezoelectric composite film fabricated by dispersing BaHfxTi(1-x)O3 (x = 0, 0.01, 0.05, 0.1) piezoelectric powders inside a polymeric matrix to facilitate f-PEHs. The fabricated f-PEH withoptimal 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-PEHand 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 adoptingthe lead-free piezoelectric composites under vibrational environments.
Abstract
Energy harvesting technology that converts the wasted energy resources into electrical energy is emerging as a semipermanentpower source for self-powered electronics and wireless low-power sensor systems. Among the various energy conversiontechniques, flexible piezoelectric energy harvesters (f-PEHs), using materials with piezoelectric effects, have attractedsignificant interest because they can harvest a small mechanical energy into electrical signals without constraints of time andspace in various environments. In this study, we used a flexible piezoelectric composite film fabricated by dispersing BaHfxTi(1-x)O3 (x = 0, 0.01, 0.05, 0.1) piezoelectric powders inside a polymeric matrix to facilitate f-PEHs. The fabricated f-PEH withoptimal 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-PEHand 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 adoptingthe lead-free piezoelectric composites under vibrational environments.
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