Figure 8 | Scientific Reports

Figure 8

From: Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts

Figure 8

(a) XPS C 1 s spectra of undoped and H(AuCl4), LiCl, LiNO3, Li2CO3 doped LPE GS films. C=C/C–C in aromatic rings (284.5 eV); C–C sp3 (285.4 eV); C–O (286.6 eV) and C=O (289 eV) were considered. For Li2CO3 a small additional peak at 289.2–291.0 eV can be assigned to carbonate. (b) Peak intensity ratio for the sum of C=C/C-C and C-C peaks intensities, and the intensity of C-O, I(C=C/C-C+C-C)/I(C-O) (black line) and the ratio of Li 1 s intensity from Li salts to Li-O intensity, ILi/ILi-O (red line). (c) XPS Li 1 s spectra for different Li compounds and for Li–O. (d) The Au 4 f peak in the XPS data of H(AuCl4).

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