Papers

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.

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