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Impact of graphite impurities on the structure and optical properties of the sodium borate oxide glass
Authors:Gomaa  Hosam M.  Saudi  H. A.  Yahia  I. S.  Ibrahim  M. A.  Zahran  H. Y.
Affiliation:1.Basic Sciences Department, Pharaohs-Higher Institute for Computer, Information Systems and Management, Giza, Egypt
;2.Girls’ Branch, Department of Physics, Faculty of Science, Al-Azhar University, Nasr City, Cairo, 11884, Egypt
;3.Advanced Functional Materials & Optoelectronic Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
;4.Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
;5.Nanoscience Laboratory for Environmental and Biomedical Applications (NLEBA), Semiconductor Lab., Department of Physics, Faculty of Education, Ain Shams University, Roxy, Cairo, 11757, Egypt
;6.Nanotechnology Research Center (NTRC), The British University in Egypt (BUE), El-Sherouk City, Cairo, 11837, Egypt
;7.Spectroscopy Department, National Research Centre, Dokki, Giza, 12622, Egypt
;
Abstract:

For the carbon-based glass fabrication/manufacture process, different amounts of pure graphite powder were added up to 100 wt.% of sodium tetraborate oxide (the weight of one mole of the sodium tetraborate is 381.372 g/mol) and then melted at 950 °C for 2 h before fast quenching in the air at RT. The resulted solids were examined by the XRD and SEM techniques, which confirmed the amorphous natures for studied samples. FTIR spectroscopy showed that some C-atoms are shared in the glass network as C–O and CO2. In contrast, the UV–Vis showed that the increase in the graphite contents/impurities causes a red shift in the value of the optical edge and the value of Fermi energy. Also, the increase of the graphite impurities causes a decrease in the bandgap values of both direct and indirect electronic transitions. Both the values of Urbach energy and the metallization indicated an increase in the crystallinity degree as the graphite content increase. A graphite-based glass is a promising material for wide-scale applications.

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