en گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper <i><span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Copper oxide (CuO) nanoparticles (NPs) were synthesized by the sol-gel method, followed by calcination at 600 ^oC for 2 h. </span></span></span><span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The XRD pattern indicated that the synthesized CuO NPs had a monoclinic structure, with an average crystallite size of 53 nm</span></span></span><span style="font-size:11.0pt"><span style="line-height:115%"><span calibri="" style="font-family:">. </span></span></span><span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The FT-IR spectra showed that surfactant molecules were adsorbed on the surface of the CuO nanoparticles, along with the presence of Cu-O bonding. The TEM analysis revealed rod-like CuO NPs with diameters of about 50 nm and lengths ranging from 150 to 200 nm.</span></span></span> <span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The XPS analysis confirmed that copper and oxygen were synthesized as the main components with Cu²⁺ and O^2-oxidation states. </span></span></span><span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The optical band gap of CuO was calculated to be 3.5 eV. </span></span></span><span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The maximum PL emission was recorded at 430 nm for the 365 nm excitation wavelength, and the change in PL intensity and peak shift was calculated as a function of excitation wavelength.</span></span></span> <span style="font-size:11.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The Mie analysis results also showed that when crystallite sizes increased, so did the maximum values of extinction efficiency, scattering efficiency, asymmetry, and scattering matrix. The findings of this study imply that CuO NPs could be a viable choice for a variety of luminous device applications. </span></span></span></i> ,CuO,nanoparticles,sol-gel,photoluminescence,Mie analysis. 0 0 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5739-1&slc_lang=en&sid=1 Moges Tsega Yihunie mogestsega@yahoo.com 1800319475328460022136 1800319475328460022136 Yes Bahir Dar University