Fig. 3. XPS results. (a) The chemical composition of GO–CNT papers as calculated from the XPS survey spectra. For each type of paper, the C/O ratio (black bars, left axis), oxygen content (red line, right axis), and carbon content (blue line, right axis) are presented. (b) The C1s core shell spectra for GO, GO–CNT10, rGO, and rGO–CNT10. (c) The O1s core shell spectra for GO, GO–CNT10, rGO and rGO–CNT10. The dashed frames indicate the range of binding energies for the contributions of carbon, specific groups of the oxygen functional groups, and chemisorbed water (CW).
