Template‐mediated control over polymorphism in MOF-CVD @Angewandte Chemie

For some metal-organic frameworks (MOFs) polymorphism can form a challenge on the synthesis outcome. In this work, we demonstrate a template-mediated MOF-CVD method controlling possible polymorphs, both powder and thin film forms are studied.

Time-resolved in situ synchrotron small-angle X-ray scattering, performed at Elettra Sincrotrone Trieste (Italy), reveals that by introducing template vapor into the MOF-CVD process, the transformation into a dense phase can be avoided, thus resulting in a porous structure.

The paper can be accessed here or on the Publications page of our website.

Lithography of MOFs on Nature Materials cover

A beautiful illustration of our research on nanoscale lithography of metal-organic frameworks made the cover of the January 2021 issue of Nature Materials.

Our paper on direct lithography of metal-organic frameworks can be accessed here or on the Publications page of our website.

α-MgFm CVD @ Chem Mater!

We demonstrate the need for a gaseous template in the solvent-free synthesis of ultramicroporous α-magnesium formate (α-MgFm). The use of a template does not only open the way for an environmentally friendly synthesis of bulk powder, but also enables the deposition of thin films. Templated MOF-CVD of α-MgFm resulted in high-quality, pinhole-free films with unexpectedly high thermal stability.

The paper can be accessed here or on the Publications page of our website.

Direct lithography of MOFs @ Nature Materials

Nanoscale patterning is a fundamental step in implementing MOFs in miniaturized solid-state devices. We developed a resist-free process to pattern MOFs via direct X-ray (DXRL) and electron-beam (EBL) lithography. This process avoids etching damage and contamination yet leaves the porosity and crystallinity of the patterned MOFs intact. Moreover, the resulting high-quality patterns have an excellent sub-50-nm resolution, approaching the mesoporous regime. To demonstrate some of the capabilities of this method, we fabricated a photonic sensor that responds to organic vapors.

This research was carried out in collaboration with VUB (Belgium), TU Munich (Germany), TU Graz (Austria), and Elettra Sincrotrone Trieste (Italy). This work, published in Nature Materials, will speed up the integration of MOFs into microchips.

You may reach us directly for more information, potential collaboration, or industrial partnerships through (Principal Investigator) or (Innovation Manager).

Al-fum-mes MOFs @ChemEurJ

Our collaborative work with Norbert Stock's group at CAU Kiel on Al-carboxylate MOFs for water sorption is now available through ChemEurJ!

In this work, two scalable synthesis routes under mild reaction conditions were developed: (1) in aqueous solutions using a continuous flow reactor and (2) through the vapour-assisted conversion of solid precursors.

MOF-CVD at SPME debuts @ Talanta!

Our paper entitled, "Solid-phase microextraction coatings based on the metal-organic framework ZIF-8: Ensuring stable and reusable fibers" led by our collaborators from Universidad de La Laguna (ULL) in Tenerife is now published in Talanta.

Supervised by Prof. Veronica Pino, a part of this work is carried out in the Ameloot Group's lab in the context of Priss' short stay in Leuven.

In this project, highly stable ZIF-8 coatings for SPME fibers prepared by chemical vapor deposition of MOF (MOF-CVD). The preparation mode ensured SPME fibers with high inter-batch reproducibility while used in DI-SPME-GC-FID. These MOF fibers performed successfully for target hydrocarbons and personal care products and its performance was compared to that of commercial SPME coatings.

More details can be found here.

MAF-6 CVD @Chem Mater!

We further prove the robustness of the MOF-CVD process by demonstrating this time for MAF-6, a large pore MOF. The CVD process is based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations.

CVD of zinc bipyridyl-triazolate films on EJIC

In collaboration with Prof. Coclite's lab at TU Graz, we report the solvent-free powder synthesis and thin film CVD of a crystalline coordination polymer obtained from the reaction of ZnO with a vaporized bipyridyl-triazole linker. The article can be accessed here.

Cleanroom MOF-CVD @ Chem Mater

Following the proof-of-concept work on the chemical vapor deposition of metal-organic frameworks (MOF-CVD) and a demonstration of its potential in microelectronics integration, we now present the fully cleanroom-compatible process for the deposition of large-area MOFs. Led by Alex, the output of this international collaboration was recently published in Chemistry of Materials. In this work, we thoroughly discussed the optimization process and unraveled the mechanism of MOF-CVD which led to a process chart—a guiding paradigm in developing future MOF-CVD formulations.

This marks an important milestone in bringing MOFs a step closer to the industrial-scale microfabrication lines and the production of MOF-based devices.

VPLE paper in Angewandte Chemie

Although generally stable, ZIFs can undergo post‐synthetic linker exchange (PSLE) in solution under mild conditions. In this work, Joao led an international team of researchers and reported this novel, solvent‐free approach to post‐synthetic linker exchange through exposure to linker vapor. The paper can be accessed here or on the Publications page of our website.


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