Fig. 6From: Enhanced photocatalytic performance of Nb doped TiO2/reduced graphene oxide nanocomposites over rhodamine B dye under visible light illuminationXPS spectra of NTG5 (a) Full range spectra, (b) Ti 2p spectra, (c) O 1 s spectra, (d) C 1s spectra and (e) Nb 3d spectraBack to article page