The disclosure provides an antimicrobial sponge comprising: a porous sponge substrate； and an antimicrobial coating composition dried therein, the composition comprising: at least one organosilane of formula (R1O)3Si—R2—Z； and an organic amine of formula R9R10R11N, wherein each R1 is independently H, alkyl, substituted alkyl, aryl, or substituted aryl, R2 is a bivalent linker, and Z is a nucleophile, a leaving group or a quaternary nitrogen substituent, and wherein R9, R10, and R11 are independently H, alkyl, substituted alkyl, aryl, substituted aryl or cyclic.
