Photoactive hetero-structures based on SnO₂, TiO₂ and CuInS₂ were prepared by robotic spray pyrolysis with optimized deposition parameters. The samples containing metal oxides have uniform and homogeneous surfaces with granular morphologies. The insertion of a CuInS₂ layer supports the development of aggregates with different shapes and sizes (0.1–1μm). The samples have a surface energy governed by the polar component, outlining the hydrophilic behaviour. According to their band gap, the metal oxides layers absorb mostly in the UV spectral region; by adding the narrow band gap CuInS₂ there is a broadening of the spectral range towards Vis, from a maximum of 400nm (for the samples containing SnO₂ and TiO₂) up to 700nm. Additionally, the components of the photoactive hetero-structure have suitably positioned energy bands allowing improved charge carrier separation and mobility. Consequently, the samples show UV–Vis photocatalytic properties outlined in air decontamination, for acetaldehyde removal.

中文翻译：

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CuInS2 / TiO2 / SnO2异质结构对空气净化的增强的UV-Vis光催化性能

通过机器人喷雾热解工艺优化沉积参数，制备了基于SnO ₂，TiO ₂和CuInS _2的光敏异质结构。包含金属氧化物的样品具有均匀且均质的表面，具有颗粒形态。CuInS ₂层的插入支持不同形状和尺寸（0.1-1μm）的聚集体的发展。样品具有由极性组分控制的表面能，概述了亲水行为。根据它们的带隙，金属氧化物层主要在紫外线光谱区域吸收；而金属氧化物层则在紫外光谱区域吸收。通过添加窄带隙CuInS ₂，可以将可见光的光谱范围从最大400nm扩展到Vis（对于含SnO ₂的样品）和TiO ₂）可达700nm。另外，光活性异质结构的组分具有适当定位的能带，从而允许改善的电荷载流子分离和迁移率。因此，样品显示出在空气净化中概述的UV-Vis光催化性能，可去除乙醛。