Studying Structural and Optical Properties of ZnO and Ag NPs Produced by Laser-Induced Plasma in liquid technique (PLAL) for Antibacterial Applications
نویسندگان
1 Department of Physics, College of Science, University of Wasit, Al-kut, Iraq
2 Department of Physics, College of Science, University of Wasit, Al-kut, Iraq
doi
10.22052/JNS.2025.03.024چکیده
The aim of this work was to examine the optical properties and structure of metal and metal oxide nanostructures. The pulsed laser ablation in liquid technique (PLAL) was used to produced colloidal solutions of silver and ZnO nanostructures with median energies 500mJ to 700mJ and the same frequency of 6Hz were prepared by using a Nd/YAG laser system with wavelength at 1064 nm. A crystalline structure and shape was shown by (XRD) pattern, which included many nanostructure peaks at different energies. Crystalline sizes were found to be (7.99-21.43) nm of the samples (ZnO) and (7.36-38.04) nm of samples Ag. .Field emission scanning electron microscopy (FE-SEM) images showed the appearance of nanostructures and their regular aggregation and the cubic - shape of Silver( Ag) , Grain clusters shape and homogeneous distribution of ZnO nanostructures .Additionally, absorbance spectra covering a range of wavelengths from 200 - 1100 nm were used to examine each colloidal solution optical characteristics Band gap energy Eg values in the optical properties decreased with increasing laser intensity, dropping within the ranges of 3.09 to 2.77 eV of ZnO and 5.54 to 5.04 eV of Ag . The antibacterial activity of ZnO and Ag nanoparticles was evaluated with two types of bacteria (Escherichia coli and Staphylococcus aureus) using the liquid method. the activity of ZnO NPs is found against E. coli at (18-23) mm and against S.aureus at (18-20)mm.The activity of Ag is found against E.coli at (21-22.5) mm, and against S. aureus at (19-21) mm by using 500mJ 700mJ, respectively.
