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Thickness-dependent Young's modulus of polycrystalline alpha-PbO nanosheets

机译：厚度依赖性杨氏模量的多晶alpha-pbo纳米片

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摘要

Litharge, in two dimensional (2D) nanostructure form, has recently ignited considerable theoretical interest due to its excellent photoelectric and magnetic properties. However, the lack of an efficient synthesis method hinders its development. Here, we provide an interfacial solvothermal strategy for controllably synthesizing ultrathin hexagonal polycrystalline alpha-PbO nanosheets in micrometer scale. This strategy can also be utilized for the synthesis of other 2D materials. Experimental atomic force microscope nanoindentation measurements reveal the relationship between the thickness of polycrystalline alpha-PbO nanosheets and the corresponding Young's modulus, expressed asE=E-0+Kt(-1). First-principles calculation supports the result and ascribes the cause to interlayer sliding from particular weak interlayer interactions. Additionally, the enhanced mechanical strength of the polycrystalline structure compared to its single-crystal counterpart is attributed to the alternate arrangement of grain-boundaries effects. The summative formula may be extended to other 2D materials with weak interlayer interactions, which has the potential to provide guidance for constructing flexible devices.
机译：由于其优异的光电和磁性，最近，二维（2D）纳米结构形式的滑链球菌最近被显着显着的理论兴趣。然而，缺乏有效的合成方法阻碍了其发展。在这里，我们提供界面溶剂热策略，用于控制微米级以上的超薄六方多晶α-PBO纳米晶片。该策略还可用于合成其他2D材料。实验原子力显微镜纳米凸缘测量揭示了多晶α-PBO纳米片厚度与相应杨氏模量之间的关系，表达ASE = E-0 + Kt（-1）。第一原理计算支持结果，并将原因归因于中间层从特定的弱层间相互作用滑动。另外，与其单晶对应物相比的多晶硅结构的增强机械强度归因于晶粒界限的交替布置。求和公式可以延伸到具有弱层间相互作用的其他2D材料，这具有潜力为构建柔性器件提供指导。

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