title: A vanadium-doped ZnO nanosheets-polymer composite for flexible piezoelectric nanogenerators.
abstract: We report high performance flexible piezoelectric nanogenerators (PENGs) by employing vanadium (V)-doped ZnO nanosheets (NSs) and the polydimethylsiloxane (PDMS) composite structure. The V-doped ZnO NSs were synthesized to overcome the inherently low piezoelectric properties of intrinsic ZnO. Ferroelectric phase transition induced in the V-doped ZnO NSs contributed to significantly improve the performance of the PENGs after the poling process. Consequently, the PENGs exhibited high output voltage and current up to ∼32 V and ∼6.2 μA, respectively, under the applied strain, which are sufficient to directly turn on a number of light emitting diodes (LEDs). The composite approach for PENG fabrication is scalable, robust, and reproducible during periodic bending/releasing over extended cycles. The approach introduced here extends the performance limits of ZnO-based PENGs and demonstrates their potential as energy harvesting devices.
authors.affiliation: Department of Electrical Engineering, Chungnam National University, Yuseong-Gu, Daejeon 34134, Korea. jnah@cnu.ac.kr.
authors.forename: Sung-Ho
authors.initials: SH
authors.lastname: Shin
authors.affiliation: Department of Electrical Engineering, Chungnam National University, Yuseong-Gu, Daejeon 34134, Korea. jnah@cnu.ac.kr.
authors.forename: Yang Hyeog
authors.initials: YH
authors.lastname: Kwon
authors.affiliation: Department of Applied Chemistry, Kyung Hee University, Yongin, Gyeonggi 17104, Korea. minhlee@khu.ac.kr.
authors.forename: Min Hyung
authors.initials: MH
authors.lastname: Lee
authors.affiliation: Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials, Yuseong-Gu, Daejeon 34103, Korea.
authors.forename: Joo-Yun
authors.initials: JY
authors.lastname: Jung
authors.affiliation: School of Mechatronics, Gwangju Institute of Science and Technology (GIST), Buk-Gu, Gwangju 61005, Korea.
authors.forename: Jae Hun
authors.initials: JH
authors.lastname: Seol
authors.affiliation: Department of Electrical Engineering, Chungnam National University, Yuseong-Gu, Daejeon 34134, Korea. jnah@cnu.ac.kr.
authors.forename: Junghyo
authors.initials: J
authors.lastname: Nah