Liu Qiong, Nie Yihan, Shang Jing, Kou Liangzhi, Zhan Haifei, Sun Ziqi, Bo Arixin, Gu Yuantong
School of Mechanical, Medical, and Process Engineering, Queensland University of Technology (QUT), Brisbane, Queensland 4001, Australia.
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China.
Nano Lett. 2021 May 26;21(10):4327-4334. doi: 10.1021/acs.nanolett.1c00883. Epub 2021 May 14.
To ensure reliability and facilitate the strain engineering of zinc oxide (ZnO) nanowires (NWs), it is significant to understand their flexibility thoroughly. In this study, single-crystalline ZnO NWs with rich axial pyramidal I () and prismatic stacking faults (SFs) are synthesized by a metal oxidation method. Bending properties of the as-synthesized ZnO NWs are investigated at the atomic scale using an high-resolution transmission electron microscopy (HRTEM) technique. It is revealed that the SF-rich structures can foster multiple inelastic deformation mechanisms near room temperature, including active axial SFs' migration, deformation twinning and detwinning process in the NWs with growth π SFs, and prevalent nucleation and slip of perfect dislocations with a continuous increased bending strain, leading to tremendous bending strains up to 20% of the NWs. Our results record ultralarge bending deformations and provide insights into the deformation mechanisms of single-crystalline ZnO NWs with rich axial SFs.
为确保氧化锌（ZnO）纳米线（NWs）的可靠性并便于进行应变工程，深入了解其柔韧性具有重要意义。在本研究中，通过金属氧化法合成了具有丰富轴向棱锥I（）和棱柱堆垛层错（SFs）的单晶ZnO NWs。使用高分辨率透射电子显微镜（HRTEM）技术在原子尺度上研究了合成后的ZnO NWs的弯曲性能。结果表明，富含SFs的结构可以在室温附近促进多种非弹性变形机制，包括活性轴向SFs的迁移、具有生长π SFs的NWs中的变形孪生和去孪生过程，以及随着弯曲应变不断增加完美位错的普遍形核和滑移，从而导致NWs产生高达20%的巨大弯曲应变。我们的结果记录了超大的弯曲变形，并为具有丰富轴向SFs的单晶ZnO NWs的变形机制提供了见解。
