“…Recently, with the development of nanomaterial architectures, a class of MOF nanostructure, MOF-on-MOF, has gathered considerable interest. , MOF-on-MOF nanocomposites are predominantly formed through growing guest MOF onto presynthesized host MOF with identical or diverse architectures, creating core–shell, hollow multishell, yolk–shell, core–satellite, or asymmetric structures. , Compared to traditional MOF, MOF-on-MOF composites have demonstrated improved performance in gas adsorption/separation, detection, and catalysis. , In drug delivery systems, core–shell nanoparticles have major advantages over simple nanoparticles leading to the improvement of properties including decreased cytotoxicity, enhanced dispersibility, biocompatibility, strengthened affinity with biomolecules and drugs due to improved surface properties, and enhanced thermal and chemical stability. − …”