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Scanning electron microscopy of ZnO, TiO2 and CuO particles. The bulk form of TiO2 was purchased from Riedel-de Haen, ZnO from Fluka and CuO from Alfa Aesar. Nanosized metal oxides were purchased from Sigma–Aldrich with advertised particles sizes of 25-70 nm for nano TiO2, 50-70 nm for nano ZnO and mean ∼30 nm for nano CuO. Observations were made using Zeiss Digital Scanning Electron Microscope (DSM 982 Gemini).
