Structural, Optical, Antibacterial Activity of Undoped, Doped and Capped ZnO Nanoparticles Prepared by Simple Chemical Method towards Eco-friendly Synthesis

The zinc oxide (ZnO) nanoparticles were prepared by using simple chemical method which was in the form of undoped, doped and capped nanoparticles. Then their structural, morphological, optical properties were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet visible spectroscopy (UV) and photoluminescence spectroscopy (PL) techniques. The hexagonal crystal structure was observed from XRD patterns and their calculated crystallite sizes were approximately 15-20 nm. The spherical shaped particles nature was observed from TEM images. The FTIR spectrum confirms the Zn-O stretching mode. The optical absorption behavior was observed from UV spectrum which was blue-shifted behavior and their calculated bandgap energy value was approximately 3.8-3.7 eV. The emission behavior was observed from PL spectrum which was enhanced emission nature. Further, the antibacterial activity was measured on E.coli. Hence the observed results are discussed in detail.