压电
材料科学
石墨烯
压电响应力显微镜
纳米片
氮化物
超晶格
压电系数
挠曲电
石墨氮化碳
氮化碳
电介质
纳米发生器
凝聚态物理
纳米技术
光电子学
铁电性
复合材料
化学
物理
催化作用
光催化
生物化学
图层(电子)
作者
Matthew Zelisko,Yuranan Hanlumyuang,Shubin Yang,Yuanming Liu,Chihou Lei,Jiangyu Li,Pulickel M. Ajayan,Pradeep Sharma
摘要
Piezoelectricity is a unique property of materials that permits the conversion of mechanical stimuli into electrical and vice versa. On the basis of crystal symmetry considerations, pristine carbon nitride (C3N4) in its various forms is non-piezoelectric. Here we find clear evidence via piezoresponse force microscopy and quantum mechanical calculations that both atomically thin and layered graphitic carbon nitride, or graphene nitride, nanosheets exhibit anomalous piezoelectricity. Insights from ab inito calculations indicate that the emergence of piezoelectricity in this material is due to the fact that a stable phase of graphene nitride nanosheet is riddled with regularly spaced triangular holes. These non-centrosymmetric pores, and the universal presence of flexoelectricity in all dielectrics, lead to the manifestation of the apparent and experimentally verified piezoelectric response. Quantitatively, an e11 piezoelectric coefficient of 0.758 C m(-2) is predicted for C3N4 superlattice, significantly larger than that of the commonly compared α-quartz.
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