The 1s orbital energy of carbon and nitron in α-C3N4, β-C3N4 and graphitic-C3N4 structures were calculated using the First-Principles method. The all-electron mixed-basis approach was used for the calculations. The numerical results were then compared to the results from the X-ray photoelectron spectroscopic study. The local structure of an amorphous CxN1-x was found to be similar to that of β-C3N4 or graphitic-C3N4.
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