中文摘要：

最近的实验表明了用薄片可以在机电的察觉到，便携技术，弥漫的计算，和植入的设备发现应用潜在的二维的瞬间 ₂ 制作的那 nanogenerators。在现在的学习，我们理论上在 nanogenerator 产量上在瞬间 ₂ 薄片检验了原子层的数字的效果。在方形波浪的应用紧张下面，有原子层的一个偶数的瞬间 ₂ 薄片没展出压电的产量，由于投射倒置对称的存在。为有层的一个奇数的瞬间 ₂ 薄片，由于倒置对称的缺乏，在另一方面，压电的产量电压和电流随层的数字的增加被产生，并且减少。而且，作为瞬间 ₂ ，薄片仅仅是一些原子厚，瞬间 ₂ nanogenerators 的电容比的小至少一个数量级基于 nanowire 、基于 nanofilm 的 nanogenerators，在高周波的应用程序启用瞬间 ₂ nanogenerators 的使用。我们的结果解释试验性的观察并且在优化并且设计二维的 nanogenerators 上提供指导。

英文摘要：

Recent experiments have demonstrated that nanogenerators fabricated using two-dimensional MoS2 flakes may find potential applications in electromechanical sensing, wearable technology, pervasive computing, and implanted devices. In the present study, we theoretically examined the effect of the number of atomic layers in MoS2 flakes on the nanogenerator output. Under a square-wave applied strain, MoS2 flakes with an even number of atomic layers did not exhibit a piezoelectric output, owing to the presence of a projected inversion symmetry. On the other hand, for MoS2 flakes with an odd number of layers, owing to the lack of inversion symmetry, piezoelectric output voltage and current were generated, and decreased with the increase of the number of layers. Furthermore, as MoS2 flakes were only a few atoms thick, the capacitance of the MoS2 nanogenerators was at least an order of magnitude smaller than that of the nanowire- and nanofilm-based nanogenerators, enabling the use of MoS2 nano- generators in high-frequency applications. Our results explain the experimental observations and provide guidance on optimizing and designing two-dimensional nanogenerators.