BACKGROUND: In this study, visible-light-derived photocatalytic activity of metal-doped titanium dioxide nanosphere (TS) stacking layers, prepared by chemical vapor deposition (CVD), was investigated. The as-grown TS spheres, having an average diameter of 100-300 nm, formed a layer-by-layer stacking layer on a glass substrate. The crystalline structures of the TS samples were of anatase-type.
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