期刊
NANO LETTERS
卷 20, 期 3, 页码 1774-1780出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04997
关键词
Shaped nanocrystals; metal-organic frameworks; coordination on MOP facets; infrared spectroscopy; molecular dynamics simulations
类别
资金
- Shanghai Tech University [18ZR1425300]
- Shanghai Natural Science Fund [18ZR1425300]
- Boston College
We studied coordination-dependent surfactant binding on shaped MOF nanocrystals. Cetyltrimethylammonium bromide (CTAB) on the surface of ZIF-8 was used as a model system. Infrared spectroscopic analysis and molecular dynamics simulations reveal different coordination environments for Zn nodes on {100} and {110} facets, resulting in different CTAB adsorption. We found that we are able to fine-tune the ratio of {100} and {110} facets in the nanocrystals. We also observed that once the MOF nanocrystals are enclosed by pure {110} facets growth along the {100} facets is terminated because the MOF nanocrystal has no surface area for CTAB adsorption. Growth can then be reinitiated through the etching of these rhombic dodecahedral nanocrystals to form a small amount of under-coordinated sites. This work represents the first systematic study of the design principles underpinning the synthesis of shaped MOF nanocrystals.
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