材料科学
结晶
蚀刻(微加工)
胶体晶体
各向同性腐蚀
纳米技术
方解石
Crystal(编程语言)
金属
化学工程
胶体
结晶学
化学
沸石
冶金
有机化学
催化作用
工程类
程序设计语言
计算机科学
图层(电子)
作者
Civan Avcı,J. Aríñez-Soriano,Arnau Carné‐Sánchez,Vincent Guillerm,Carlos Carbonell,Inhar Imaz,Daniel Maspoch
标识
DOI:10.1002/anie.201507588
摘要
Controlling the shape of metal-organic framework (MOF) crystals is important for understanding their crystallization and useful for myriad applications. However, despite the many advances in shaping of inorganic nanoparticles, post-synthetic shape control of MOFs and, in general, molecular crystals remains embryonic. Herein, we report using a simple wet-chemistry process at room temperature to control the anisotropic etching of colloidal ZIF-8 and ZIF-67 crystals. Our work enables uniform reshaping of these porous materials into unprecedented morphologies, including cubic and tetrahedral crystals, and even hollow boxes, by an acid-base reaction and subsequent sequestration of leached metal ions. Etching tests on these ZIFs reveal that etching occurs preferentially in the crystallographic directions richer in metal-ligand bonds; that, along these directions, the etching rate tends to be faster on the crystal surfaces of higher dimensionality; and that the etching can be modulated by adjusting the pH of the etchant solution.
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