Fabrication of Nanoparticles@MOFs Composites via a Solvent‐Induced Strategy for CO ₂ Cycloaddition Reactions

It is well accepted that the synergistic effect between components in metal–organic frameworks (MOFs)–based composites can enhance their physicochemical properties. However, the accurate relationship between component ratio and synergistic effect remains unclear, and the regulation of such composites still poses a significant challenge. Herein, two CuO@Cu (BDC)(DMF)‐based (BDC = terephthalic acid, DMF = N , N‐ dimethylformamide) composites with similar compositions but different morphologies are fabricated via a solvent‐induced method assisted by a surfactant, using Cu (BDC)(DMF)/CTAB (CTAB = cetyltrimethylammonium bromide) as the precursors. The Cu (BDC)(DMF)/CTAB precursors are first prepared by incorporating CTAB into the Cu (BDC)(DMF) nanosheet structure. Subsequently, CuO@Cu (BDC)(DMF) nanosheets and CuO@CuBDC‐R rods are obtained by immersing the precursor in hot absolute ethanol and a water/ethanol mixed solvent, respectively. Notably, the CuO nanoparticles (NPs) in both composites are derived from the Cu‐MOFs component. Furthermore, in the cycloaddition reaction of CO 2 with epoxides, the synergistic catalytic performance of both CuO@Cu (BDC)(DMF) nanosheets and CuO@CuBDC‐R rods is highly dependent on the compositional ratio of their NPs and MOFs components. This work not only provides a valuable guideline for the design of MOFs‐based composites but also highlights their promising potential in the field of CO 2 utilization.