HYBRID EVENT: You can participate in person at Rome, Italy or Virtually from your home or work.

10th Edition of World Nanotechnology Conference

March 10-12, 2025

March 10 -12, 2025 | Rome, Italy
World Nano 2022

Mohamed Elmahi Mohamed Ahmed

Mohamed Elmahi Mohamed Ahmed, Speaker at Nanoscience Conferences
Sudan University of Science and Technology, Italy
Title : Structural and optical properties of ZnO nano-powder synthesized by combustion and sol-gel method


ZnO is considered as the most important chemical compounds due to their distinctive properties owing to its wide band gab and large exciton binding energy. It is well known that the structural and the optical properties of ZnO differ by different methods of preparation. X-ray diffraction (XRD) and Transmission electron microscopy (TEM) were used to determine the structure properties of un-doped ZnO powders. Ultraviolet visible spectroscopy (UV-Vis) and Photoluminescence spectroscopy (PL) were used to determine the optical properties of un-doped ZnO powders prepared by both sol-gel and combustion method. The obtained results from ZnO synthesized by the sol- gel method showed that the crystallite size of ZnO was increases by increasing of the annealing temperature. Also, little change in the lattice parameter was observed when the annealing temperature increased, this change may be attributed to the change of particle size and quantum size effects. It is observed also that similar structure of ZnO prepared by sol-gel and combustion can be obtained at particular conditions. TEM studies showed that the ZnO nanocrystals are irregularly spherical with average diameter of 32 nm which is similar to the calculated crystallite size from the XRD data. The calculated energy band gab of ZnO prepared by sol-gel method is found to be increased with increasing the annealing temperature. There was a clear difference between the two PL spectra obtained from ZnO synthesized by a different method which is assigned to be due to complicated defect chemistry relevant to the experimental process. Also, the concentration and the type of defect are basically associated with preparation method.

Audience take-away:

  • The audience will be able to know the effect of the preparation methods (Combustion and Sol-gel) on the structure and optical properties of un-doped ZnO.
  • Using of X-ray diffraction (XRD) and Transmission electron microscopy (TEM) techniques to determine the structure properties of un-doped ZnO nano-powders.
  • Using of UV-Vis spectrometer and photoluminescence (PL) techniques to determine the optical properties of un-doped ZnO nano-powders.
  • The audience will know the difference in the structural and optical properties of the sample with different methods of synthesized.


Mr. Mohamed is studying Condensed Matter of Physics at University of Messina, Italy. He graduated from Sudan university of Science and Technology department of physics in 2015, then he received his Master’s degree in Physics in 2018 at the same institution. He has been working as Teaching assistant at SUST. Also, has been working at University of Khartoum in laboratory of Physics, collage of Engineering.