4.7 Article

BiOBr Micro-Nanosheets: Controllable Synthesis and Piezoelectric and Photoelectric Properties

期刊

CRYSTAL GROWTH & DESIGN
卷 21, 期 12, 页码 7179-7185

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.1c01026

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资金

  1. National Natural Science Foundation of China [51872311, 51902331, 11974250]
  2. Shanghai International Science and Technology Cooperation Fund Project [18520723200]
  3. Science and Technology Commission of Shanghai Municipality [19070502800, 19ZR1464900]
  4. Frontier Science Key Project of the Chinese Academy of Sciences [QYZDB-SSW-JSC027]

向作者/读者索取更多资源

The research successfully prepared uniform BiOBr single-crystal micro-nanosheets with reversible polarization switching and a typical butterfly-shape piezoelectric hysteresis loop, showing high displacement. Photoelectric characteristics show photoelectric anisotropy and photoelectrochemical response, attributed to piezoelectricity and significant increase in surface potential.
The intrinsic electric field in piezoelectric materials strongly controls the recombination dynamics, and choosing a specific piezoelectric material in designing a photocatalyst is of great interest. Herein, uniform BiOBr single-crystal micro-nanosheets with 2-8 mu m side length and 100-300 nm thickness were suitably prepared using a hydrothermal method after optimizing the fabrication parameters. A near single-domain structure with reversible polarization switching was detected along with a typical butterfly-shape piezoelectric hysteresis loop, showing over 150 pm displacement under a similar to 37 V bias voltage. Photoelectric characterization displayed almost a three times difference for the photoelectric anisotropy along and perpendicular to the plane, whereas the photoelectrochemical measurement indicated a low charge transfer resistance and a correspondingly efficient photoelectrochemical response under 365 nm laser, which are attributed to the significant increase in surface potential observed using Kelvin probe force microscopy and the potential internal field related to the piezoelectricity.

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