Superb hydroxyl radical-mediated biocidal effect induced antibacterial activity of tuned ZnO/chitosan type II heterostructure under dark

ZnO Nanopillar Coated Surfaces with Substrate‐Dependent Superbactericidal Property

“…It has been demonstrated here that the ZnO nanopillars on zinc have super activity in killing both adhered and nonadhered bacteria by surface rupturing and constantly releasing radicals without the need of photoirradiation. Recently, photoactive semiconductors and nanocomposite materials for antibacterial application have attracted great attentions . The novel redox active ZnO nanopillar on zinc demonstrated in this study has much more potent bactericidal property without additional irradiation.…”

“…It is well known that ROS or radicals could kill bacteria efficiently, especially for those semiconductors such as ZnO, TiO 2 , and MoS 2 . The radical killing effect has been well studied through scavenger quenching experiments .…”

Bioactive silver phosphate/polyindole nanocomposites

“…52 The valence band edge potential of Ag 3 PO 4 (E VB ¼ 2.66 eV) is greater than E H of $OH/H 2 O (2.2 eV) which makes it a potent source of $OH radicals, which has been shown to result in antibacterial activity. 16 The composites reported here also show radical induced antibacterial activity. Pln was chosen to stabilise the nanocomposite as Ag 3 PO 4 is structurally unstable when it is dissolved in water.…”

“…Biolm inhibition of S. aureus and E. coli was quantied by a colorimetric detection process. 6,16,58 Specically, fresh inoculums (1 Â 10 6 CFU mL À1 , 200 mL) was pipette out white 96 wellplate onto which the nanocomposite solutions (1g L À1 ) were added and incubated at 37 C for 4 days. Control wells were marked without the nanomaterials.…”

“…14 Various nanomaterials display antibacterial activity: e.g. ZnO, 15,16 TiO 2 , 17,18 MgO, 6 ZnO/TiO 2 nanohybrids, 19 ZnO/ZnFe 2 O 4 , 20 CuO, 21 Ag 3 PO 4 (ref. 22) etc.…”