Fig. 4From: Hydrothermal synthesis of In2O3 nanoparticles hybrid twins hexagonal disk ZnO heterostructures for enhanced photocatalytic activities and stabilityXPS survey spectrum of Zn-In-4 and corresponding high-resolution XPS spectra: (b) Zn2p, (c) In3d and (d) O1s. The units of Fig. 4 (a),(b),(d) should be "Binding Energy" rather than "Banding Energy". The replaceable Fig. 4 (a), (b), (d) shown in attachmentBack to article page