Structural and optical properties of CdO nanostructures prepared by atmospheric-pressure CVD

► Various shapes of CdO nanostructures were grown by AP-CVD using Cd and H2O. ► This diversity is due to the competition between VLS and VS mechanisms. ► The temporal evolution of Au catalyst particles also contributes to the diversity. ► Photoacoustic spectra were changed, depending on the substrate temperature. ► This is probably related to the intrinsic defects and/or residual impurities.