沸石咪唑盐骨架
纳米晶
堆积
材料科学
咪唑酯
纳米技术
晶体生长
表面扩散
透射电子显微镜
化学物理
结晶学
金属有机骨架
化学
吸附
无机化学
物理化学
有机化学
作者
Xiaocang Han,Rui Su,Wenqian Chen,Qi Han,Yuan Tian,Ji-Sheng Han,Xiaodong Wang,Shuangxi Song,Kolan Madhav Reddy,Hexiang Deng,Pan Liu,Mingwei Chen
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:15 (17): 7703-7709
被引量:4
摘要
Understanding the growth and coarsening mechanisms of metal-organic framework (MOF) nanoparticles is crucially important for the design and fabrication of MOF materials with diverse functionalities and controllable stability. Oriented attachment (OA) growth is a common manner of MOF nanocrystal coarsening and agglomeration, but the underlying molecular mechanisms have not been well understood to date. Here we report the molecular-scale characterization of the OA interfaces of zeolitic imidazolate framework (ZIF) crystals by state-of-the-art low-dose aberration-corrected transmission electron microscopy. A series of OA interfaces with different molecular structures are captured, implying that multiple kinetic steps are involved in the OA growth of ZIF crystals from non-directional physical attractions between primary nanocrystals, lattice-aligned attachment of the ligand-capped nanocrystals, to coherent interfaces with perfect lattice alignment or stacking faults. It was found that the surface-capping organic ligands not only play an essential role in crystal lattice alignment by near-field directional interactions, but also dominate the interfacial reaction kinetics by interfacial diffusion-controlled elimination of excess surface-capping ligands. These observations provide molecular-scale insights into the OA growth mechanisms of ZIF crystals, which is important for engineering MOF crystal growth pathways by designing surface-capping ligands.
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