Vapor-Phase Synthesis of ZIF-8 MOF Thick Film by Conversion of ZnO Nanorod Array

Langmuir : the ACS Journal of Surfaces and Colloids
Shunsuke TanakaKota Imawaka

Abstract

ZIF-8 metal organic framework "micrometer-thick" films were constructed from ZnO precursor by a vapor-phase synthesis. The ZnO-to-ZIF-8 crystal transformation proceeded in the presence of 2-methylimidazole (Hmim) vapor. Continuous coatings of intergrown ZIF-8 crystals require control of a nucleation density. The dependence of ZnO crystal plane on the ZnO-to-ZIF-8 crystal transformation was investigated using four bulk ZnO single crystals: a-plane (11-20), c-plane (0001), m-plane (10-10), and r-plane (10-11). It was revealed that the m-plane (10-10) of ZnO is more effectively transformed into ZIF-8. In this work, highly oriented ZnO nanorod array film was used to provide the transport pathway of Hmim molecules and volume expansion space of ZnO-to-ZIF-8 crystal transformation for nucleation and crystal intergrowth. The high conversion of ZnO nanorod array into ZIF-8 in a short time could be achieved because (1) such mass transfer is easy due to the uniform internanorod distance being maintained during reaction and (2) the surface of the nanorod array is dominated by the highly reactive m-plane (10-10).

References

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Citations

Dec 22, 2020·Advanced Science·Renheng BoAntonio Tricoli
Dec 4, 2019·ACS Omega·Shunsuke Tanaka, Yasuhito Tanaka
Sep 9, 2021·Proceedings of the National Academy of Sciences of the United States of America·Abhishek RoyBarry Fish
Dec 28, 2021·Accounts of Chemical Research·Pengcheng SuWanbin Li

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