Hyperporphyrin Effect-Driven Bandgap Narrowing in Cationic Fe3O4@ICOF for Boosted Photothermal Immunoassay
A methylation-mediated cationization strategy to construct core−shell Fe3O4@ICOF, where a cationic porphyrin COF shell is grown on a magnetic Fe3O4 core, establishing a clear structure-electronics-photothermal performance correlation, providing a design method for high-performance point-of-care pathogen sensors.