Femtosecond nonlinear optical and antibacterial studies of P. stenopetala mediated ZnO nanoparticles
摘要
We report synthesis, structural, morphological, linear & nonlinear optical, and antibacterial studies of Plumeria stenopetala mediated zinc oxide nanoparticles. The leaf extract of P. stenopetala was used to synthesize zinc oxide nanoparticles. The x-ray diffraction pattern peaks demonstrate that ZnO is crystallized with a hexagonal wurtzite structure. FTIR spectroscopy was used to investigate the band locations. The surface morphology was examined using SEM. The linear optical absorption was studied using UV–Visible spectroscopy. The direct band gap is measured to be 3.35 eV and the photoluminescence studies shows red emission at 644 nm. The femtosecond nonlinear optical properties were studied using Z-scan technique (150 fs, 80 MHz, 700 nm). The third order nonlinear optical coefficients are determined and optical limiting behavior was studied. Further, the nanoparticles were tested against two gram negative bacteria Pseudomonas aeruginosa and Escherichia coli. These investigations show that the prepared nanoparticles are good candidate for bio-medical and nonlinear optical applications.