Thesis (M.Sc.) - Cairo University - National Institute of Laser Enhanced Science - Department of Laser Science and Interactions

All the previous studies have been reviewed only the synthesis of graphene by microwave plasma chemical vapor deposition technique, but no study has been reviewed the synthesis of graphene oxide by (MWPCVD) technique. In this thesis, a simple experiment was constructed for rapid synthesize of graphene and graphene oxide (GO) sheets simultaneously using microwave plasma chemical vapor deposition (MWPCVD) technique, which uses a microwave source (magnetron) operating at a frequency of 2.45 GHZ and a power of 700W to produce plasma inside a tube of quartz. The high-density polyethylene which consists of small beads was used as a carbon source. The graphene and graphene oxide were deposited after the quartz tube was evacuated by a rotary pump for 30 min and exposed to microwave irradiation with a power of 700W for 2 minutes. The graphene and graphene oxide sheets were characterized by different techniques such as transmission electron microscopy (TEM), X-ray diffraction, Raman spectroscopy, UV-Visible spectroscopy, Spectrofluorometer and FT-IR spectroscopy. TEM showed that the morphology of graphene suspension sheets are not perfectly flat but exhibit crumpled and folded. X-ray diffraction for graphene showed that the presence of a high and small peak around 2k = 24.56{u00BA} and 2k= 43.65{u00BA} respectively, which indicated that graphene has an amorphous carbon structure. Raman spectra indicated the difference between position and shape of peaks, crystal size and intensity ratio of the D to G modes (ID/IG) for graphene and graphene oxide

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