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The adsorption and detection of SO2 using Zr-based MOF, NU-1000 grafted with an organometallic nickel silylphosphine complex ([NiSi]@NU-1000) via post-synthetic modification are reported. [NiSi]@NU-1000 exhibits high stability under dry and wet SO2, with a high cyclability performance. Moreover, fluorescence experiments postulate [NiSi]@NU-1000 as a promising SO2 detector due to its high SO2 selectivity over CO2 and air, showing an evident quenching effect, especially at low SO2 concentrations (0.1 bar of SO2). Time-resolved photoluminescence experiments suggest that host-guest SO2 interactions are associated with the turn-off effect 

Creating 3D printed structures from materials with shape memory properties allows these structures to change form, modifying configuration or function over time in response to external stimuli such as temperature, light, electrical current, etc. This area of additive manufacturing has come to be known as 4D printing. A variety of geometries have been previously explored in the context of 4D printing, including foldable surfaces (e.g. Origami), lattices, and bio-inspired shapes. However, with advances in solid modeling software tools, more sophisticated spatially- varying lattices are now easily generated to further optimize the mechanical performance and functionality of a 4D printed structure. In this work, complex lattices are created to bend at specific locations with intentionally-reduced stiffness and improved compliance based on locally-reduced strut dimensions. By experimentally demonstrating more complex geometries in the study of 4D printing, new applications can be considered that were not previously possible, with tailored performance allowing for balancing between weight and actuation.