Figure 2.
(a) XPS measurement of TGO, (284.0 eV C=C; 284.4 eV C-O; 289.0 eV C=O; (b) XPS of HGO, (284.0 eV C=C; 285.3 eV C-O; 287.4 eV C=O and 289.2 eV O-C=O).
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