期刊
JOURNAL OF APPLIED PHYSICS
卷 129, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/5.0052482
关键词
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资金
- ERC [802205]
- NSFC [11772234]
Atomistic simulations demonstrate that flexoelectricity can generate electricity from crumpled graphene sheets. By creating localized developable (d)-cones through indentation of circular graphene sheets, it is found that the voltage generated from crumpling graphene exceeds the expected generation by about an order of magnitude.
We utilize atomistic simulations that account for point charges and dipoles to demonstrate that flexoelectricity, which arises from strain gradients, can be exploited to generate electricity from crumpled graphene sheets. Indentation of a circular graphene sheet generates localized developable (d)-cones, for which we verify the core radius and azimuthal angle with established theoretical models. We determine the voltage that can be generated based on the resulting electrostatic fields and compare the voltage generation to previous theoretical predictions that are scaled down to the nanoscale. In doing so, we find that the voltage generated from crumpling graphene exceeds, by about an order of magnitude, the expected voltage generation, indicating the benefit of exploiting the large strain gradients that are possible at the nanoscale. Finally, we demonstrate that crumpling may be a superior mechanism of flexoelectric energy generation as compared to bending of two-dimensional nanomaterials.
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