Fig 1.
FESEM micrograph of pure and Cu-doped ZnO-NPs: pure ZnO (a) 2 μm and (b) 1 μm, Cu doped ZnO (c) 4 μm (d) 2 μm (e) 1 μm (f) 500 nm.
Fig 2.
(a) XPS survey of the as-synthesized Cu-doped ZnO nanoparticles. (b) High resolution Zn 2p, (c) Cu 2p, and (d) O 1s XPS spectra.
Fig 3.
Raman spectrum of the as-synthesized ZnO and Cu-doped ZnO nanoparticles.
Fig 4.
XRD pattern of Cu-doped ZnO nanoparticles showing peaks for different contents in the sample.
Fig 5.
Zone of inhibition formed by ZnO-NPs against different bacteria.
Fig 6.
Zone of inhibition formed by Cu-doped ZnO-NPs against different bacteria.
Table 1.
Zone of inhibition values (mm) of different concentrations of ZnO-NPs and Cu-doped ZnO-NPs against different bacteria.
Fig 7.
Bar graph showing the diameter of the zone of inhibition (in mm) produced by (a) ZnO-NPs and (b) Cu doped ZnO-NPs against gram positive and gram-negative bacteria.
Fig 8.
Schematic antimicrobial mechanism of Cu-doped ZnO-NPs against microbial strain.