Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.
Nano Lett. 2022 May 25;22(10):3939-3945. doi: 10.1021/acs.nanolett.2c00240. Epub 2022 May 16.
Triboelectricity has been known since antiquity, but the fundamental science underlying this phenomenon lacks consensus. We present a flexoelectric model for triboelectricity where contact deformation induced band bending at the nanoscale is the driving force for charge transfer. This framework is combined with first-principles and finite element calculations to explore charge transfer implications for different contact geometry and materials combinations. We demonstrate that our based formulation is compatible with existing empirical models and experimental observations including charge transfer between similar materials and size/pressure dependencies associated with triboelectricity.
摩擦起电现象古已有之，但这一现象背后的基础科学仍缺乏共识。我们提出了一种摩擦起电的挠曲电模型，其中纳米级接触变形引起的能带弯曲是电荷转移的驱动力。该框架结合第一性原理和有限元计算，探讨了不同接触几何形状和材料组合对电荷转移的影响。我们证明了我们的基于的公式与现有的经验模型和实验观察结果是兼容的，包括相似材料之间的电荷转移以及与摩擦起电相关的尺寸/压力依赖性。
