Department of Physics

Permanent URI for this communityhttps://repository.cuilahore.edu.pk/handle/123456789/24

Browse

Subject: search.filters.subject.Coprecipitation Method

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Synthesis of Zinc Ferrites and Carbon Dots Composite by Coprecipitation Method and Insight into the Physical Properties
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) M. Qamar Jahan; CIIT/FA19-RPH-022/LHR; Dr. Mukhtar Ahmad; LHR TP 7674
    Magnetic core-shell (zinc ferrites/c-dots composite are properly synthesized under this research using a simple co- precipitation and hydrothermal process. Various approaches are used to investigate zinc ferrites and carbon dots composites like X-ray diffraction (XRD), Scanning electron microscope (SEM), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and vibrating sample magnetometer (VSM). XRD diffraction demonstrated an inverse spinel structure of zinc ferrites; the lattice parameter was decreased from 8.19Å to 8.10Å and carbon dots having rods like structure. This provided excellent chemical stability for about 40 hours. From SEM analysis, the composite seem to be uniformly dispersed or coated using low contrast consecutive c- dots layers to produce a core-shell structure. Zinc ferrites are agglomerated in non- uniform in size, whereas carbon dots and its composites are in uniform shape according to SEM image. The EDX study indicated that the substitution was successful. For zinc ferrites, carbon dots and composite the FTIR spectra showed that the absorption band of the tetrahedral site is now around 654 cm -1 , 795cm -1 , 658cm -1 respectively. Different bonds in the infrared spectrum match to specific function groups and bonding in various chemicals. The magnetic characterizations were investigated using a vibration sample magnetometer (VSM) at room temperature (0 , and the results indicate that sample Zinc Ferrites/Carbon dots displays ferrimagnetic behavior.
  • No Thumbnail Available
    Item
    Study of Optical, Morphological and Structural Properties of Mg Doped ZnO Nanoparticles Prepared by Coprecipitation Method
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) MUHAMMAD AWAIS ALI; CIIT/SP20-RPH-049/LHR; Dr. Saif Ur Rehman; LHR TP 7697
    Zinc oxides (ZnO) are commonly employed as semiconductor variables in solar fusion due to their large bandgap. This dissertation includes the preparation of undoped ZnO and Mg doped ZnO (MZO) nanoparticles using coprecipitation method. Different concentration of Mg (2%, 4%) wt. ratios were used to dope with bare ZnO. Structural, morphological, and optical properties were studied using Raman spectroscopy, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and UV-Vis spectroscopy. Raman spectroscopy was used to detect the electron-phonon interaction in ZnO. The FTIR spectra revealed several peaks, each of which corresponded to a different functional group. The field emission scanning electron microscopy used to study the surface morphology and particle size of the prepared nanostructures. The average size of the undoped ZnO nanoparticle was 110 nm, while the 2% MZO and 4% MZO the sizes are 125 nm and 150 nm respectively. Increasing of Mg concentration resulted in increased particle size. UV- Visible spectroscopy was utilized to assess the absorbance and bandgap of doped and Mg doped ZnO nanoparticles. In case of 4% MZO doping the higher absorption (5.66) found with band gap of 3.320 eV. Raman analysis verified phase segregation due to the significant E2 mode. It is a promising option for optoelectronics, spintronics, and solar cells since it can be doped to close the band gap. “