Synthesizing, Characterizing and Studying Structural and Optical Properties of Pure a: PbO, Sn: a: PbO, and Co: a: PbO Prepared by Co-Pricptation Method
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Date
2024-08
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Addis Ababa University
Abstract
In this study, undoped α-PbO and α-PbO nanoparticles doped with tin (Sn) and cobalt (Co) were synthesized using a co-precipitation technique. Characterization through XRD confirmed that the nanoparticles had a tetragonal α-PbO crystal structure, with average crystalline sizes ranging from 12.18 nm to 41.33 nm for Co and Sn doping. Reflectance spectroscopy showed that pure PbO had higher reflectance compared to Sn:α-PbO and Co:α-PbO. The optical band gaps were 1.86 eV for α-PbO, 2.86 eV for Sn:α-PbO, and 1.46 eV for Co:α-PbO, indicating a decrease in band gap with Co doping due to defect levels introduced by Co and Pb ions. Sn:α-PbO had a larger band gap than both pure PbO and Co:α-PbO. Photoluminescence studies showed lower emission for doped nanoparticles, indicating reduced electron-hole recombination. SEM revealed an average nanoparticle diameter of 5.50 nm for α-PbO, increasing to 7.8 nm with Sn doping. EDX analysis showed atomic percentages of Sn:α-PbO and Co:α-PbO as 0.63:55.15:44.22, respectively.
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Pure Lead Oxide Tin, Cobalt Doping Thin Film, Co-Precipitation Method, Structural Optical Properties, UV-vis