<p>Despite the rising need for advanced antimicrobial materials to fight drug-resistant pathogens, conventional antibacterial treatments frequently have limited efficacy and stability issues. This study aims to overcome these issues by creating a unique Ag@ZIF-67 heterostructure that synergistically combines the structural benefits of metal-organic frameworks with the antimicrobial qualities of silver nanoparticles and provides longer-lasting and improved antibacterial activity. The heterostructure was created using a simple two-step procedure that involved in situ deposition of silver nanoparticles (Ag NPs) and controlled growth of zeolitic imidazolate framework-67 (ZIF-67). Scanning electron microscopy (SEM) confirmed the successful formation of the Ag@ZIF-67 heterostructure with well-dispersed Ag NPs (average size 10.96 nm) throughout the ZIF-67 matrix. The key innovation is the synergistic heterostructure design, which overcomes the rapid depletion and aggregation issues of traditional silver-based antimicrobials by allowing regulated silver release while producing reactive oxygen species through cobalt centers. Antimicrobial activity testing of Ag@ZIF-67 against common pathogens, including <i>Staphylococcus aureus</i> (<i>S. aureus</i>) and <i>Klebsiella pneumoniae</i> (<i>K. pneumoniae</i>), revealed superior inhibition compared to pristine ZIF-67 and Ag NPs, with minimum inhibitory concentrations (MICs) ranging from 3.9 to 7.8 μg/mL. This innovative Ag@ZIF-67 heterostructure represents a promising platform for preparing antimicrobial materials for healthcare and environmental applications.</p> Graphical Abstract <p></p>