The public discussion took place for the Doctoral student (Noor Saadi Saleh) at Anbar University, College of Science, Department of Physics, on Thursday, 12/2/2026, in the Jaber Ibn Hayyan Hall, for his tagged thesis
" The Influence of Rare Element Oxides Content on the Properties of Tin Dioxide Thin Films for Electronic Applications"
The discussion committee consisted of:

This work investigates the synthesis of SnO2 thin films using Pulsed Laser Deposition (PLD) and the impact of laser energy and rare-earth mixing. XRD and FE-SEM results confirmed that increasing pulse energy enhances crystallinity, crystallite size, and surface roughness. The study further explored mixing Sm2O3 and Eu2O3 at various concentrations (5%, 7%, and 9 wt.%) to tune the film properties. It was found that 5 wt.% Sm2O3 and 7 wt.% Eu2O3 successfully reduced particle sizes to 25.7 nm and 18.62 nm, respectively. Optical analysis showed an increase in absorbance and a decrease in the energy bandgap from 3.4 eV to 3.20 eV after mixing. Photoluminescence (PL) spectra exhibited a red shift, confirming the reduction in the energy gap due to the added elements. The EDX analysis verified the uniform distribution of Sm and Eu while noting a decrease in oxygen percentage with mixing. The fabricated sensors demonstrated optimal performance at an operating temperature of 200°C for both NO2 and H2S gases. Mixing with Sm2O3 significantly enhanced the sensor's sensitivity and efficiency toward the oxidizing gas NO2. Conversely, the addition of Eu2O3 markedly improved the sensor's detection capabilities for the reducing gas H2S.