Cu2O/TiO2/Pt复合薄膜的制备及其性能

为了降解环境污染物,通过磁控溅射的方法在玻璃基底上溅射沉积Cu2O/TiO2/Pt复合薄膜。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、紫外可见分光光谱仪(UV-vis)和光致发光光谱仪(PL)对复合薄膜的表面形貌和光学性能进行分析。通过可见光下对甲基橙溶液的光催化降解试验研究了薄膜的光催化活性。结果表明:Cu2O/TiO2/Pt复合薄膜共有3层,从下到上依次为Pt层、锐钛矿型TiO2层和Cu2O层。薄膜表面平整致密,由形状规则的球形颗粒组成。Cu2O/TiO2/Pt复合薄膜的光催化活性高于Cu2O/TiO2复合薄膜的和纯TiO2薄膜的光催化活性。光催化活性的提高是由于Pt层的存在进一步抑制了光生电子与空穴的复合,延长了光生载流子的寿命,提高了量子产率,进而有效地改善了薄膜的光催化活性。

Preparation and Properties of Cu2O/TiO2/Pt Composite Films

In order to degrade environmental pollutants, Cu2O/TiO2/Pt composite films were deposited on glass substrates using magnetron sputtering method. The surface morphologies and optical properties of the composite films were characterized by Xray diffraction (XRD), scanning electron microscopy (SEM), UVvisible spectroscopy (UVvis) and photoluminescence spectroscopy (PL). The photocatalytic activity of the samples was evaluated by the photocatalytic degradation of methyl orange aqueous solution under visible light irradiation. The results indicate that the Cu2O/TiO2/Pt composite films consist of three layers: Pt layer, anataseTiO2 layer and Cu2O layer from the bottom to the top. The surface of the films is even and composed of regularshaped spherical particles. The photocatalytic activity of the Cu2O/TiO2/Pt composite films exceeds that of the Cu2O/TiO2 composite films and the pure TiO2 films. Such enhancement is ascribed to the presence of the Pt layer, which further inhibits the photogenerated electronhole recombination, prolongs the lifetime of the photogenerated carriers, increases the quantum efficiency and hence improves the photocatalytic activity of the film effectively.