Figure 2.
(a) X-ray photoelectron spectroscopy (XPS) spectra of GO, 0.1 g TBT, 0.2 g TBT, 0.25 g TBT, 0.3 g TBT, 0.35 g TBT, and 0.4 g TBT. (b) XPS spectra of GO, 0.05 g P25, 0.1 g P25, 0.25 g P25, 0.4 g P25, and 0.75 g P25. C 1s core-level spectra for (c) GO, (d) 0.25 g TBT, (e) 0.05 g P25, and (f) Ti 2p core.