Oriented assembly of metal-organic frameworks and deficient TiO2 nanowires directed by lattice matching for efficient photoreversible color switching

The photoreversible color switching system (PCSS) is attracting increasing attention for use in alleviating energy crisis and environmental problems. We report a robust PCSS which lattice matching enables bottom-up oriented assembly between metal-organic frameworks (MOFs) inorganic nanocrystals (INCs), two distinct entities that differ drastically structure function. Specifically, cubic-phase Prussian blue (PB) of framework backbone spontaneously attached to rutile TiO2 nanowires defined orientation triggered by the (001) plane (222) PB. Ultraviolet light irradiation accelerates photoelectron transport within TiO2/PB fast photo switching. derived paper can be ranked as one best light-printing papers literature because its high resolution (∼ µm) capability repeatedly written >100 times without significant loss contrast. ultrathin are rich oxygen Ti vacancies, allow visible- sunlight-light printing. Density functional theory calculations suggest [Fe(CN)6]4− ligand from PB attaches preferentially (110) surface give ordered assembly. findings demonstrate strong versatility particles-mediated advanced materials design.