Metal nanomaterials, such as ZnO NPs, AgNPs, AuNPs, CuNPs, iron oxide nanoparticles (Fe3O4 NPs) and titanium dioxide nanoparticles (TiO2 NPs), are widely used as promising nanocarriers for the antimicrobial drug delivery.77 These nanoparticles also used as antimicrobial agents itself.Common metallic nanoparticles have been discussed in the following sections.