In this paper, Ag/α-Al2O3 composites were fabricated from biosynthesized AgNPs, and their antibacterial performance against
S. aureus and E. coli was investigated. Ag NPs with sizes 18.0±5.6 nm were produced through the rapid reduction of [Ag(NH3)2]+with
dried Corynebacterium sp. SH09 assisted by [OH-]. The AgNPs were completely immobilized onto α-Al2O3 after calcination at 200 oC
without aggregation. Both the biosynthesized AgNPs and Ag/α-Al2O3 composites exhibited good and rapid antibacterial abilities on
S. aureus and E. coli. The Ag/α-Al2O3 composites loaded 1 wt.% Ag killed 100% of E. coli and S. aureus after contact time of 30 s and
5 min, respectively.