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Cerium-oxide-nanoparticle-decorated zinc oxide was successfully prepared using a simpleone-pot hydrothermal technique with different weight% Ce doping. It was found that an increasein Ce doping has an effect on the optical energy band-gap tunability. Ce dopant provides electrontrapping on Ce/ZnO nanocomposites and also acts as a surface defect generator during hydrothermalprocessing. Additionally, a bi-metal oxide heterojunction forms, which acts as a charge separatorto obstruct chargedoi:10.3390/app10051697 fatcat:y3pxtkxve5crzdnh4emqtlnq4u