发表机构
Gwangju Institute of Science and Technology; Advanced Photon Source, Argonne National Laboratory; Chosun University; European XFEL（光州科学技术院; 阿贡国家实验室先进光子源; 朝鲜大学; 欧洲自由电子激光设施）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用Bragg相干衍射成像结合自相关分析，原位观察了Au纳米颗粒中晶畴从各向异性多畴向平衡截角八面体单晶的形貌演化，揭示了畴合并与粗化机制。
AI 中文摘要
理解金属纳米颗粒的动态结构演化对于调控其功能特性至关重要。本研究利用三维相干X射线衍射技术，原位退火过程中研究了多畴纳米颗粒中Au纳米晶畴的形貌转变。通过将Bragg相干衍射成像与自相关函数分析相结合，我们观察到了从各向异性多畴构型向单晶平衡形貌的转变。在600摄氏度以上，一个小附属畴并入主畴，主畴在625摄氏度下持续粗化，导致形貌更加各向同性。最终，在635摄氏度时，低能{111}和{100}晶面出现，晶体形状收敛至平衡截角八面体几何构型。本工作展示了一个用于解释复杂畴动力学的框架，为畴生长和平衡形状形成提供了基础性见解。
英文摘要
Understanding the dynamic structural evolution of metallic nanoparticles is crucial for tailoring their functional properties. In this study, we utilized three-dimensional coherent X-ray diffraction to investigate the morphological transformation of Au nanocrystalline domains in a multi-domain nanoparticle during in-situ annealing. By combining Bragg coherent diffraction imaging with autocorrelation function analysis, we observed a transformation from an anisotropic multi-domain configuration toward a single crystalline equilibrium morphology. Above 600 degrees Celsius, a small subsidiary domain merged into the primary domain, which was continuously coarsened at 625 degrees Celsius, resulting in a more isotropic morphology. Finally, at 635 degrees Celsius, the low-energy {111} and {100} facets emerged, and the crystal shape converged toward an equilibrium truncated octahedral geometry. This work demonstrates a framework for interpreting complex domain dynamics, offering fundamental insights into domain growth and equilibrium shape formation.
Comments7 pages, 6 figures
