University of Kashan Journal of Nanostructures 2251-7871 15 3 2025 07 01 Preparation and Characterization of Physical Properties of CMC: PVP-SiO2 Nanocomposites 1115 1120 114939 10.22052/JNS.2025.03.029 EN Mustafa Saeed Science Department - College of Basic Education, Mustansiriyah University, Iraq Widad H. Albanda Science Department - College of Basic Education, Mustansiriyah University, Iraq Mohammed A. Kadhum Department of Physics, College of Science, University of Diyala, Iraq Journal Article 2025 03 20 In this study, we fabricated CMC-PVP films doped with diverse amounts of SiO2 via casting method approach to examine their optical and structural characteristics. To create the samples, distilled water and a certain weight proportion of CMC and PVP polymers were first combined using a magnetic mixer and heated to 60°C for 1 h. The resulting homogenous solution was then poured into glass molds and allowed to evaporate. FTIR spectroscopy was used to examine the film structures and validate interactions between SiO2 and the CMC-PVP blend. According to optical analysis, transmittance values decreased as the proportion of SiO2 doping enhanced. Additionally, the refractive index, extinction coefficient, reflectance, absorbance, and absorption coefficient were enhanced. The optical energy gap values decreased with increasing SiO2 doping percentages, which were varied from 3.96 eV to 3.73 eV. https://jns.kashanu.ac.ir/article_114939_8015ded36b15374ea3ec5d66fe6effab.pdf