Table 4.

Values of parameter D determined from the first derivative of C KLL AES spectra, C sp³ percent resulting from parameter D and fitting of C 1s spectra. Evaluation of C sp³ from C KLL spectra was performed using a calibration curve and parameter D for standards of 13.2 eV (C sp³) and 23.1 eV (C sp²) [49].

Sample	Parameter D (eV)	C sp3 (%) (C KLL)	C sp3 (%) (C 1s)
* GO-foil	19.1	40	28.6
GO-driedUHV	16.8	64	36
** rGO-N2H4	18.0	52	15.8
** rGO-N2H4-MW	21.0	21	19.1
rGO-N2H4-MWT	21.5	16	13.9
GO-exp	15.7	75	22.5
rGO-exp-N2H4	21.5	16	20.6
* rGO-CH2O	18.7	45	17.5
rGO-CH2O-MWT	17.8	54	16.8
rGO-HCO2H-MWT	21.5	16	20.5
* Gr	21.6	15	9.2
* Gr-exp	19.6	35	14.3

* from [22], ** from [23].