https://scholars.lib.ntu.edu.tw/handle/123456789/628858
標題: | Shape-Tunable BaTiO3 Crystals Presenting Facet-Dependent Optical and Piezoelectric Properties | 作者: | Chen, Jing-Wei Pal, Arnab Chen, Bo-Hao Kumar, Gautam Chatterjee, Subhodeep Peringeth, Kiran ZONG-HONG LIN Huang, Michael H |
關鍵字: | barium titanate; facet-dependent properties; ferroelectricity; piezoelectricity; pyroelectricity | 公開日期: | 三月-2023 | 出版社: | WILEY-V C H VERLAG GMBH | 卷: | 19 | 期: | 9 | 來源出版物: | Small (Weinheim an der Bergstrasse, Germany) | 摘要: | BaTiO3 octahedra, edge-, and corner-truncated cubes, and cubes with four tunable sizes from 132 to 438 nm are synthesized by a solvothermal growth approach. Acetic acid treatment can cleanly remove BaCO3 impurity. Rietveld refinement of X-ray diffraction patterns and Raman spectra help to confirm the particles have a tetragonal crystal structure. The crystals also exhibit size- and facet-dependent bandgap shifts. BaTiO3 octahedra show larger piezoelectric, ferroelectric, and pyroelectric effects than truncated cubes and cubes. The measured dielectric constant differences should be associated with their various facet-dependent behaviors. Piezoelectric nanogenerators fabricated from BaTiO3 octahedra consistently show the best performance than those containing truncated cubes and cubes. In particular, a nanogenerator with 30 wt.%-incorporated octahedra displays an open-circuit voltage of 23 V and short-circuit current of 324 nA. The device performance is also highly stable. The maximum output power reaches 3.9 µW at 60 MΩ. The fabricated nanogenerator can provide sufficient electricity to power light-emitting diodes. This work further demonstrates that various physical properties of semiconductor crystals show surface dependence. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/628858 | ISSN: | 1613-6810 | DOI: | 10.1002/smll.202205920 |
顯示於: | 醫學工程學研究所 |
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