Top views of the gray tiling and red concrete pavement before and after the growth of ZnO nanostructures; SEM top-view pictures showing: ZnO nanowires on the tiling surface, ZnO nanorods and nanostructures on the concrete surface; UV–visible spectral plot with the Tauc–Lorentz model of the sample surfaces: ZnO-decorated tiling and ZnO-decorated concrete
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