材料科学
双晶片
压电
锆钛酸铅
复合材料
功勋
磁铁
溅射
箔法
声学
光电子学
铁电性
电气工程
薄膜
电介质
纳米技术
物理
工程类
作者
Hong Goo Yeo,Tiancheng Xue,Shad Roundy,Xiaokun Ma,Christopher D. Rahn,Susan Trolier‐McKinstry
标识
DOI:10.1002/adfm.201801327
摘要
Abstract For piezoelectric energy harvesters, a large volume of piezoelectric material with a high figure of merit is essential to obtain a higher power density. The work describes the growth of highly (001) oriented sputtered lead zirconate titanate (PZT) films ( f ≈ 0.99) exceeding 4 µm in thickness on both sides of an Ni foil to produce a bimorph structure. These films are incorporated in novel wrist‐worn energy harvesters (<16 cm 2 ) in which piezoelectric beams are plucked magnetically using an eccentric rotor with embedded magnets to implement frequency up‐conversion. The resulting devices successfully convert low‐frequency vibration sources (i.e., from walking, rotating the wrist, and jogging) to higher frequency vibrations of the PZT beams (100–200 Hz). Measured at resonance, six beams producing an output of 1.2 mW is achieved at 0.15 G acceleration. For magnetic plucking of a wrist‐worn nonresonant device, 40–50 µW is produced during mild activity.
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