Synthesis of Na-doped ZnO nanowires and their antibacterial properties

Na-doped ZnO nanowires with an average diameter of ~ 40 nm have been fabricated by a thermal decomposition route at temperatures around 400 °C. Their properties have been investigated using X-ray diffraction, field emission scanning electron microscope, Raman spectra, photoluminescence spectra and X-ray photoelectron spectra. Photoluminescence spectra showed that the as-synthesized ZnO samples exhibited strong visible emission with a major peak at 420 nm. Furthermore, intensity of the visible emission at 420 nm enhanced as the increase of Na concentration. The improvement of visible emission in the Na-doped ZnO samples should be a result of the surface defects increased by doping of Na in ZnO. Their antibacterial activities were also evaluated by determination of minimum inhibitory concentration (MIC) against Escherichia coli 25922 in vitro. Antibacterial tests indicated these nanomaterials showed good antibacterial properties after UV illumination for a short time.

Na-doped ZnO nanowires have been fabricated by a decomposition route. The results indicated that the Na-doped and pure ZnO exhibited excellent antibacterial activities, which showed their potential applications in antibacterial agents. The reactive oxygen species level of 1.2 mol% Na-doped ZnO increased up to 300% compared to pure ZnO.Figure optionsDownload as PowerPoint slide