Anti-bacterial activity 1 Antibacterial properties 1 Antibacterial tests 1 Blue emission bands 1 Energy gap 1 Fourier transform infrared spectroscopy 1 II-VI semiconductors 1 Inhibition zones 1 Morphology 1 Nanoparticles 1 Optical properties 1 Particle size analysis 1 Sol-gel process 1 Sol-gel technique 1 Sol-gels 1 Synthesis (chemical) 1 Ultraviolet visible analysis 1 X ray diffraction 1 Zinc oxide 1 Zinc oxide nanoparticles 1 ZnO nanoparticles 1 antibacterial test morphology 1 optical properties 1 pH 1 sol-gel technique 1