Papers

IL-CVD as frontispiece in Angewandte Chemie!

Our work on the chemical vapor deposition of ionic liquids (IL-CVD) has been featured as frontispiece in Angewandte Chemie!

In this work, we demonstrated for the first time the chemical vapor deposition of ILs. IL-CVD allows the formation of ionogel thin films and microdrops in high resolution. The non-volatile ionic liquid is formed on a surface by reaction of two non-volatile precursors. A broad range of applications will benefit from this new approach, which enables the fabrication of microdevices.

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

Scattering model for composite stereolithography @ ACS Applied polymer materials

Fillers are used to modify the properties of photoresins used in stereolithography (SLA). The resulting composite formulations tend to have a decreasing cure depth for increasing particle loadings due to light scattering. However, some composites show the opposite effect: the cure depth increases with the particle loading. This study provides insights into light scattering in the particle filled SLA resins to unify these seemingly contradictory observations.

A modified Lambert−Beer equation that considers both scattering and absorption was established to evaluate the findings and expand the understanding of scattering in these composite formulations. This unified working curve equation facilitates the further development of particle-matrix SLA resins.

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

Metal halide perovskite photodetector arrays via dry lift-off patterning @Adv. Eng. Mat.

Metal halide perovskites draw increasing attention as photodetector materials due to their strong visible light absorption and resulting photocurrent. The development of efficient fabrication routes to realize high-resolution perovskite pixel arrays is critical to enable practical devices.

In this work, we report a dry lift-off process to fabricate methylammonium lead iodide (MAPbI3) pixels on different substrates, with a resolution down to 5 µm. Accordingly, 8 × 10 photodetector arrays were fabricated on both glass and flexible polyethylene terephthalate (PET). These arrays show a sensitive photoresponse over a broad wavelength range from 320 to 760 nm. Moreover, when encapsulated by a Parylene-C overlayer, the photodetector arrays on glass substrate show remarkable air stability, without noticeable performance loss after 10 days in ambient air, and the flexible photodetector arrays on PET substrate show excellent bending tolerance, retaining nearly 95% of the response after 170 bending cycles.

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

CVD of Ionic Liquids @Angewandte Chemie

Film deposition and high-resolution patterning of ionic liquids (ILs) remain a challenge, despite a broad range of applications that would benefit from this type of processing.

In this work, we demonstrate for the first time the chemical vapor deposition (CVD) of ILs. The IL-CVD method is based on the formation of a non-volatile IL through the reaction of two vaporized precursors. Ionogel micropatterns can be easily obtained via the combination of IL-CVD and standard photolithography, and the resulting microdrop arrays can be used as microreactors.

The IL-CVD approach will facilitate leveraging the properties of ILs in a range of applications and microfabricated devices.

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

Photoswitching in anthracene loaded MOFs @EJIC

The confinement of luminescent guest molecules in porous host materials can induce photophysical properties different from either component in isolation.

In this work, we present the photophysical behavior of anthracene and its substituted analogs in a series of metal-organic frameworks (MOFs) and inorganic molecular sieves. Fluorescence photoswitching of the guest molecules through photoinduced dimerization is observed only in MOFs with a favorable pore volume and geometry.

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

Selective deposition of TiO2 @ACS Applied materials & interfaces

Our collaborative work with Imec on the defect-free area-selective atomic layer deposition of titanium oxide has now been published in ACS applied materials & interfaces.

In this work, we investigate the selective deposition of titanium oxide by plasma halogenation of amorphous carbon acting as a growth-inhibiting layer. Additionally, the value of imaging techniques such as atomic force microscopy for understanding defect formation mechanisms and accurately assessing growth selectivity is highlighted.

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

Our 3D lateral flow test on Advanced Materials cover

An illustration of our research on the 3D printing of monolithic capillarity-driven microfluidic devices for diagnostics made the inside front cover of the June 2021 issue of Advanced Materials.

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

In situ full adsorption isotherms by "NMR-Relaxorption" @JACS

In collaboration with Prof. Sakellariou (KULeuven), we demonstrate how low-field NMR can be used to measure full adsorption isotherms. By selectively measuring 1H spins of the adsorbed probe molecules, rather than the vapour phase, this "NMR -Relaxorption" technique provides insights about local dynamics beyond what can be learned from physisorption alone.

The benchtop integration of physisorption and NMR relaxometry for in situ, in operando measurements is illustrated by three case studies on prototypical microporous materials.

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

Review on MOF applications @Angewandte Chemie

Reticular design has enabled the tailorability of MOF properties beyond any other material class. This resulted in significant advances from both a fundamental and an applied perspective. In this review, we discuss the milestones in MOF research, their pathway towards real-world applications and the major challenges that need to be addressed along the way.

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

MOF-CVD precursor paper @Dalton Transactions

Chemical vapor deposition of metal-organic frameworks (MOF-CVD) will facilitate the integration of porous and crystalline coatings in electronic devices. In the two-step MOF-CVD process, a precursor layer is first deposited and subsequently converted to MOF through exposure to linker vapor.

This work discusses the impact of different metal oxide and metalcone layers as precursors for the MOF-CVD of zeolitic imidazolate framework ZIF-8 films. These precursor layers were prepared by atomic and molecular layer deposition, physical vapor deposition; the effect of treatments such as humidification and annealing of the precursors were also tested.

Check out the paper on the Publications page or through the link to the publisher's page (Dalton Transactions).

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