Browsing by Author "Sefiu A. Bello"

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    Evaluation of Environmentally Friendly Zinc Oxide Nanoparticles Synthesized Using Carica papaya Leaf Extract for Renewable Energy Applications
    (IRAQI JOURNAL OF APPLIED PHYSICS, 2026-01-01) Sunday W. Balogun; Hakeem O. Oyeshola; Sefiu A. Bello; Hope K. Adewumi; Yekinni K. Sanusi
    This research explores the green synthesis of zinc oxide nanoparticles using Carica papaya leaf extract as a reducing agent. With a focus on developing reliable, eco-friendly, and cost-effective nanomaterial for device technologies, this sustainable method offers an alternative to conventional bulk material synthesis. Synthesized powder samples were characterized using XRD, FTIR, UV-Vis spectroscopy, SEM, EDX, and TEM. Spin-coating technique was used for thin-film deposition, while current-voltage properties were measured using a four-point probe system connected to a Keithley 2400 measurement unit and a solar simulator. Absorption peaks ranged from 299-382 nm as recorded from UV-visible, which is inferior to bulk material at 410 nm. The band gap energy was estimated to be 3.47 eV, resistance 5192.63 Ω, resistivity 132.0038 Ωm⁻¹, and conductivity 7.6×10⁻³ Sm⁻¹ were determined. These results highlight ZnO nanoparticles potential for renewable energy and semiconductor applications