In-situ nanomechanical studies of piezoelectric semiconductor ZnO NWs

Piezoelectric semiconductor nanowires (NWs) have been researched as the building blocks for various energy transducing applications. The electromechanical
interaction, also known as piezoelectricity, couples the mechanical and the electrical state in crystalline materials with no inversion symmetry, i.e., the application of
mechanical strain results in the generation of electrical charge and vice versa. On the other hand, nanostructures were demonstrated to exhibit yield strengths reaching
the ultimate limit for the respective material, hence allowing large elastic deformations. The extended mechanical deformation range makes terms of higher orders,
and thus non-linearities, play a major role in the mechanical and piezoelectric behavior of nanomaterials. This proposal focuses on the linear and non-linear nano-
mechanical properties of ZnO nanowires investigated by in-situ three-point bending tests in cimbination with Laue microdiffraction

压电半导体纳米线（Piezoelectric semiconductor nanowires, NWs）已被研究作为各类能量转换应用的构建单元。机电耦合效应，又称压电性，可在无反演对称性的晶体材料中实现机械状态与电学状态的耦合：施加机械应变会诱导电荷产生，反之亦然。另一方面，研究证实纳米结构的屈服强度可达到对应材料的理论极限，因此能够实现大弹性变形。扩展的机械变形范围使得高阶项乃至非线性效应在纳米材料的力学与压电行为中占据重要地位。本研究聚焦于氧化锌（ZnO）纳米线的线性与非线性纳米力学性能，通过原位三点弯曲试验结合劳厄微衍射（Laue microdiffraction）展开探究。