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Oriented attachment interfaces of zeolitic imidazolate framework nanocrystals.

Xiaocang Han1, Rui Su2, Wenqian Chen3,4

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.

Nanoscale
|April 11, 2023
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Summary
This summary is machine-generated.

This study reveals how metal-organic framework (MOF) nanoparticles grow and merge. Surface ligands guide the attachment of zeolitic imidazolate framework (ZIF) crystals, controlling their final structure and stability.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Understanding metal-organic framework (MOF) nanoparticle growth is key for functional material design.
  • Oriented attachment (OA) is a common MOF coarsening mechanism, but its molecular details are unclear.

Purpose of the Study:

  • To characterize the molecular mechanisms of OA interfaces in zeolitic imidazolate framework (ZIF) crystals.
  • To elucidate the role of organic ligands in ZIF OA growth.

Main Methods:

  • Low-dose aberration-corrected transmission electron microscopy (TEM) was used for molecular-scale imaging.
  • Analysis of various OA interfaces in ZIF crystals.

Main Results:

  • Multiple kinetic steps in ZIF OA growth were observed, from initial attraction to lattice-aligned attachment.
  • Surface-capping organic ligands were found to direct lattice alignment and control interfacial reaction kinetics.
  • Ligand diffusion and elimination were identified as critical factors in interfacial reactions.

Conclusions:

  • The study provides molecular-scale insights into ZIF OA growth mechanisms.
  • Surface-capping ligands are crucial for controlling ZIF crystal assembly and stability.
  • Engineering ligands offers a pathway to tailor MOF crystal growth.