Surface- and Strain-Mediated Reversible Phase Transformation in Quantum-Confined ZnO Nanowires
Surface- and Strain-Mediated Reversible Phase Transformation in Quantum-Confined ZnO Nanowires
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量子限制 ZnO 纳米线中表面和应变介导的可逆相变
DOI：
10.1103/physrevlett.123.216101
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发表时间：
2019
影响因子：
8.6
通讯作者：
Wang Jianbo
中科院分区：
文献类型：
--
作者：
Zhao Peili;Guan Xiaoxi;Zheng He;Jia Shuangfeng;Li Lei;Liu Huihui;Zhao Lulu;Sheng Huaping;Meng Weiwei;Zhuang Yuanlin;Wu Jiangbing;Li Luying;Wang Jianbo
ZnO在量子限制尺寸范围（亚2 nm）的相稳定性仍然存在激烈的争论。Applyingin situ（扫描）透射电子显微镜，我们提出了从原来的纤锌矿结构的相变的原子观的中间体为中心的tetraxides和h-MgO结构下的量子限制的ZnO纳米线的拉伸应变。引人注目的是，这种结构转变在释放应力后是可逆的。进一步的理论计算反映了过渡路径，并提供了基本的洞察力，整体景观的表面和应变依赖的相变行为。我们的结果为解决ZnO相稳定性难题提供了关键部分，这可能对推进各种纳米技术至关重要，例如，量子点发光器件。
The phase stability of ZnO in a quantum-confinement size regime (sub-2-nm) remains fiercely debated. Applyingin situ(scanning) transmission electron microscopy, we present the atomistic view of the phase transitions from the original wurtzite structure to an intermediate body-centered tetragonal and h-MgO structure under tensile strain in quantum-confined ZnO nanowires. Strikingly, such structural transitions are reversible after releasing the stress. Further theoretical calculations mirror the transition pathway and provide basic insight into the overall landscape regarding surface- and strain-dependent phase transition behavior. Our results provide the critical piece to solve the puzzle in phase stability of ZnO, which may prove essential for advancing a variety of nanotechnologies, e.g., quantum-dot light-emitting devices.