Uneven Strain Distribution Induces Consecutive Dislocation Slipping, Plane Gliding, and Subsequent Detwinning of Penta-Twinned Nanoparticles

• DOI: 10.1021/acs.nanolett.3c03788
• Publication Date: 2024-01-17T20:38:37Z
• Authors: Miao Song; Jianming Cui; Colin Ophus; Jaewon Lee; Tianyu Yan; Kristen A. Fichthorn; Dongsheng Li
• Keywords: Slipping; Atomic units; Elastic energy

Twin structures possess distinct physical and chemical properties by virtue of their specific twin configuration. However, twinning detwinning processes are not fully understood on the atomic scale. Integrating in situ high resolution transmission electron microscopy molecular dynamic simulations, we find tensile strain asymmetrical 5-fold twins Au nanoparticles leads to boundary migration through dislocation sliding (slipping an layer) along boundaries reactions at axis under beam. Migration one or two layers planes is governed energy barriers, but overall, total energy, including surface, lattice strain, relaxed after consecutive migration, leading a process. In addition, surface rearrangement twinned can aid