Out-of-Plane Polarization in Bent Graphene-Like Zinc Oxide and Nanogenerator Applications

Tan Dan; Willatzen Morten; Wang Zhong Lin

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Out-of-Plane Polarization in Bent Graphene-Like Zinc Oxide and Nanogenerator Applications

机译：弯曲石墨烯状氧化锌和纳米发电机应用中的面外极化

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摘要

Highly efficient piezoelectric nanogenerator operation is demonstrated based on dynamic bending of graphene-like ZnO nanosheets. Energy is harvested by an external resistor by virtue of a strong time-varying piezoelectric polarization component perpendicular to the graphene-like ZnO plane. It is shown analytically and verified numerically using molecular dynamics simulations that the 6 over bar m2 point group of flat graphene-like ZnO is reduced to monoclinic m symmetry for bent graphene-like ZnO. The latter symmetry allows for a nonzero and large piezoelectric polarization component perpendicular to the plane of the 2D structure. The numerical results confirm that flexoelectric effects are negligible subject to graphene-like ZnO bending operation.

机译：基于石墨烯状ZnO纳米片的动态弯曲，证明了高效压电纳米发电机的运行。垂直于石墨烯状ZnO平面的强时变压电极化分量通过外部电阻器收集能量。通过分子动力学模拟分析和数值验证表明，扁平石墨烯状ZnO的6个bar m2以上的点组还原为单斜晶m对称。后者的对称性允许垂直于2D结构平面的非零且大的压电极化分量。数值结果证实，在类似石墨烯的ZnO弯曲操作中，柔电效应可以忽略不计。

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来源
《Advanced Functional Materials》 |2020年第5期|1907885.1-1907885.8|共8页
作者
Tan Dan; Willatzen Morten; Wang Zhong Lin;
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作者单位

Chinese Acad Sci Beijing Inst Nanoenergy & Nanosyst Beijing Key Lab Micronano Energy & Sensor CAS Ctr Excellence Nanosci Beijing 100083 Peoples R China|Univ Chinese Acad Sci Sch Nanosci & Technol Beijing 100049 Peoples R China;

Chinese Acad Sci Beijing Inst Nanoenergy & Nanosyst Beijing Key Lab Micronano Energy & Sensor CAS Ctr Excellence Nanosci Beijing 100083 Peoples R China|Univ Chinese Acad Sci Sch Nanosci & Technol Beijing 100049 Peoples R China|Georgia Inst Technol Sch Mat Sci & Engn Atlanta GA 30332 USA;

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正文语种 eng
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关键词
graphene-like ZnO; molecular dynamics; monolayers; out-of-plane polarization; piezoelectric effect;

机译：石墨烯状ZnO;分子动力学单层面外极化;压电效应;

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Out-of-Plane Polarization in Bent Graphene-Like Zinc Oxide and Nanogenerator Applications

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