Department of Physics

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Author: search.filters.author.Dr. Mukhtar AhmedSubject: search.filters.subject.FA23

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    Investigation of Manganese-Magnesium Ferrites and Nickel Oxide Composites Synthesized via Hydrothermal Method
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025) Saleeha Idrees Alvi; CIIT/FA23-RPH-035/LHR; Dr. Mukhtar Ahmed; LHR TP 9861
    Hydrothermal Method ,Chemical synthesis of Mn₀.₃Mg₀.₇Fe₂O₄/NiO nanocomposites for groundwater fluoride reduction using hydrothermal technique. Manganese chloride (MnCl₂), magnesium chloride (MgCl₂), ferric chloride (FeCl₃), and nickel chloride (NiCl₂) were reacted with sodium hydroxide (NaOH) to produce the nanocomposites. Because of their capacity to create stable spinel ferrite structures and support improved fluoride adsorption, these precursors were chosen. Several characterization approaches were used to assess the synthesized materials' performance and characteristics. The production of crystalline spinel ferrite and NiO phases with average crystallite sizes in the nanometer range was verified by X-ray diffraction (XRD).Scanning Electron Microscopy (SEM) showed spherical nanoparticles with uniform shape. Strong absorption was detected in the visible range by ultraviolet-visible (UV-Vis) spectroscopy, suggesting appropriate optical characteristics and enabling the band gap energy to be estimated. By detecting the distinctive vibrational modes of spinel ferrite and NiO, Raman spectroscopy provided additional confirmation of their creation, bolstering the structural and phase purity of the produced nanomaterials. As a promising, magnetically recoverable, and reusable material for sustainable water filtration, the Mn₀.₃Mg₀.₇Fe₂O₄/NiO composite showed remarkable fluoride removal effectiveness (>90%) under ideal pH circumstances.
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    Exploring the Effects of Graphene Oxide Additives on Ag/NiFe2O4 Nanocomposites for Energy Storage Devices
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2025-07-25) Fatima Muhammad; CIIT/FA23-RPH-015/LHR; Dr. Mukhtar Ahmed; LHR TP 9846
    This study examines the production and characterization of Ag/NiFe₂O₄ nanocomposites enhanced with Graphene Oxide (GO) to improve their energy storage ability. X-ray diffraction (XRD) indicates the creation of a spinel NiFe₂O₄ structure with notable crystallographic planes (311), (220), and (440). The sharpness and intensity of the peaks imply strong crystallinity, whereas other characteristics corroborate the presence of Ag and GO. Raman spectroscopy confirms these findings by displaying specific vibrational modes. The spectra show expanded D and G bands in the GO-doped samples, indicating excellent integration of Graphene Oxide and improved structural disorder, which leads to greater electron mobility. Pure NiFe₂O₄, Ag-doped, and GO-incorporated samples show substantial differences, emphasizing GO's synergistic role in improving structural and electrical characterization. UV-Visible spectroscopy reveals a considerable decrease in band gap energy from 1.43 eV (pure NiFe₂O₄) to 0.237 eV (Ag/NiFe₂O₄), with a little rise to 0.264 eV with GO addition. The tunability of the band gap suggests increased conductivity and photo response, both of which are the desired characteristics for electrode materials in supercapacitors and other energy Storage Devices. Adding GO to Ag/NiFe₂O₄ nanocomposites increases crystallinity, structural flaws, and optical and electrical characteristics. These enhancements establish the composite as a promising contender for next-generation energy storage systems.