@article{jha_mukhin_ghorai_morshedian_canty_delgado-licona_brown_pyrch_castellano_abolhasani_2025, title={Photo-Induced Bandgap Engineering of Metal Halide Perovskite Quantum Dots In Flow}, volume={2}, ISSN={["1521-4095"]}, url={https://doi.org/10.1002/adma.202419668}, DOI={10.1002/adma.202419668}, abstractNote={Abstract Over the past decade, lead halide perovskite (LHP) nanocrystals (NCs) have attracted significant attention due to their tunable optoelectronic properties for next‐generation printed photonic and electronic devices. High‐energy photons in the presence of haloalkanes provide a scalable and sustainable pathway for precise bandgap engineering of LHP NCs via photo‐induced anion exchange reaction (PIAER) facilitated by in situ generated halide anions. However, the mechanisms driving photo‐induced bandgap engineering in LHP NCs remain not fully understood. This study elucidates the underlying PIAER mechanisms of LHP NCs through an advanced microfluidic platform. Additionally, the first instance of a PIAER, transforming CsPbBr 3 NCs into high‐performing CsPbI 3 NCs, with the assistance of a thiol‐based additive is reported. Utilizing an intensified photo‐flow microreactor accelerates the anion exchange rate 3.5‐fold, reducing material consumption 100‐fold compared to conventional batch processes. It is demonstrated that CsPbBr 3 NCs act as photocatalysts, driving oxidative bond cleavage in dichloromethane and promoting the photodissociation of 1‐iodopropane using high‐energy photons. Furthermore, it is demonstrated that a thiol‐based additive plays a dual role: surface passivation, which enhances the photoluminescence quantum yield, and facilitates the PIAER. These findings pave the way for the tailored design of perovskite‐based optoelectronic materials.}, journal={ADVANCED MATERIALS}, author={Jha, Pragyan and Mukhin, Nikolai and Ghorai, Arup and Morshedian, Hamed and Canty, Richard B. and Delgado-Licona, Fernando and Brown, Emily E. and Pyrch, Austin J. and Castellano, Felix N. and Abolhasani, Milad}, year={2025}, month={Feb} }
 @article{rather_vallabhuneni_pyrch_barrubeeah_pillai_taassob_castellano_kota_2024, title={Color morphing surfaces with effective chemical shielding}, volume={15}, ISSN={["2041-1723"]}, url={https://doi.org/10.1038/s41467-024-48154-y}, DOI={10.1038/s41467-024-48154-y}, abstractNote={Abstract Color morphing refers to color change in response to an environmental stimulus. Photochromic materials allow color morphing in response to light, but almost all photochromic materials suffer from degradation when exposed to moist/humid environments or harsh chemical environments. One way of overcoming this challenge is by imparting chemical shielding to the color morphing materials via superomniphobicity. However, simultaneously imparting color morphing and superomniphobicity, both surface properties, requires a rational design. In this work, we systematically design color morphing surfaces with superomniphobicity through an appropriate combination of a photochromic dye, a low surface energy material, and a polymer in a suitable solvent (for one-pot synthesis), applied through spray coating (for the desired texture). We also investigate the influence of polymer polarity and material composition on color morphing kinetics and superomniphobicity. Our color morphing surfaces with effective chemical shielding can be designed with a wide variety of photochromic and thermochromic pigments and applied on a wide variety of substrates. We envision that such surfaces will have a wide range of applications including camouflage soldier fabrics/apparel for chem-bio warfare, color morphing soft robots, rewritable color patterns, optical data storage, and ophthalmic sun screening.}, number={1}, journal={NATURE COMMUNICATIONS}, author={Rather, Adil Majeed and Vallabhuneni, Sravanthi and Pyrch, Austin J. and Barrubeeah, Mohammed and Pillai, Sreekiran and Taassob, Arsalan and Castellano, Felix N. and Kota, Arun Kumar}, year={2024}, month={May} }
 @article{barth_pyrch_mccormick_danilov_castellano_2024, title={Excited State Bond Homolysis of Vanadium(V) Photocatalysts for Alkoxy Radical Generation}, volume={8}, ISSN={["1520-5215"]}, url={https://doi.org/10.1021/acs.jpca.4c04250}, DOI={10.1021/acs.jpca.4c04250}, abstractNote={Advancements in photocatalysis have transformed synthetic organic chemistry, using light as a powerful tool to drive selective chemical transformations. Recent approaches have focused on metal-halide ligand-to-metal charge transfer (LMCT) photoactivated bond homolysis reactions leveraged by earth-abundant elements to generate valuable synthons for radical-mediated cross-coupling reactions. Of recent utility, oxovanadium(V) LMCT photocatalysts exhibit selective alkoxy radical generation from aliphatic alcohols upon blue light (UVA) irradiation under mild conditions. The selective photochemical liberation of alkoxy radicals is valuable for applying late-stage fragmentation approaches in organic synthesis and depolymerization strategies for nonbiodegradable polymers. Steady-state and time-resolved spectroscopy were used to assign the electronic structure of three well-defined V(V) photocatalysts in their ground and excited states. We assign the excited state for this transformation at earth-abundant vanadium(V), interrogating the electronic structure using static UV–visible absorption, ultrafast transient absorption, and electron paramagnetic resonance spectroscopy coupled to computational approaches. These findings afford assignments of the short-lived excited state intermediates that dictate selective homolytic bond cleavage in metal alkoxides, illustrating the valuable insight gleaned from fundamental investigations of the molecular photochemistry responsible for light-escalated chemical transformations.}, journal={JOURNAL OF PHYSICAL CHEMISTRY A}, author={Barth, Alexandra T. and Pyrch, Austin J. and McCormick, Conor T. and Danilov, Evgeny O. and Castellano, Felix N.}, year={2024}, month={Aug} }