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Solvent-free bottom-up patterning of zeolitic imidazolate frameworks
Yurun Miao1, Dennis T Lee1, Matheus Dorneles de Mello2,3
1Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA.
Nature Communications
|January 21, 2022
Summary
Researchers developed a novel electron beam method to precisely pattern metal-organic frameworks (MOFs) like zeolitic imidazolate frameworks (ZIFs) at the nanoscale. This technique enables the creation of intricate patterns for advanced miniaturized devices.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Submicrometer patterning of metal-organic frameworks (MOFs) is essential for their use in miniaturized devices.
- Current methods for MOF patterning face significant challenges in achieving high resolution and scalability.
Purpose of the Study:
- To develop a novel, developer-free, all-vapor phase technique for submicrometer patterning of MOFs.
- To demonstrate the capability of electron beam (e-beam) irradiation for precise MOF patterning.
Main Methods:
- A bottom-up approach using e-beam assisted patterning of zeolitic imidazolate frameworks (ZIFs), specifically ZIF-8 and ZIF-67.
- Pretreatment of metal oxide precursors with linker vapor to sensitize the surface to e-beam irradiation.
- Selective inhibition of MOF conversion in irradiated areas while allowing growth in non-irradiated zones.
Main Results:
- Achieved well-resolved MOF patterns with feature sizes down to 100 nm.
- Demonstrated effective inhibition of ZIF growth in e-beam irradiated areas.
- Confirmed that ZIF growth in non-irradiated areas remained unaffected.
Conclusions:
- The developed e-beam assisted technique offers a precise and scalable method for MOF patterning.
- This developer-free, vapor-phase approach facilitates the integration of MOFs into micro- and nanofabrication processes.
- The technique holds promise for advancing the development of next-generation miniaturized devices incorporating MOFs.
