“…eV is a representative of energy of the electrons discharged from atoms of the material owing to the O 1s state filling; an electron from the L-shell filling the K-shell, combined with an electron being discharged from an L-shell. Such peak results from the degeneration of a more active electron filling the available hole resulting from the x-ray photon alongside an emission by a characteristic energy of the difference between the states comprised in the process [26,27]. Table S1 (see supporting information) shows the XPS elemental analysis of the carbon nanofibres with atomic concentrations of 73.58 at% C 1s, and 26.42 at% O 1s.…”