Stable ZnO@TiO2 core/shell nanorod arrays with exposed high energy facets for self-cleaning coatings with anti-reflective properties
Stable ZnO@TiO2 core/shell nanorod arrays with exposed high energy facets for self-cleaning coatings with anti-reflective properties
复制标题
DOI：
10.1039/c4ta00455h
复制
发表时间：
2014-04
影响因子：
--
通讯作者：
Ruosong Wang;H. Tan;Zhao Zhao-Zhao;Guoqiang Zhang;Laiwen Song;W. Dong;Zaicheng Sun
中科院分区：
文献类型：
--
作者：
Ruosong Wang;H. Tan;Zhao Zhao-Zhao;Guoqiang Zhang;Laiwen Song;W. Dong;Zaicheng Sun
纳米结构的金属氧化物如ZnO和TiO 2由于其大的带隙以及它们的亲水性和光催化性而被广泛用作自清洁涂层。我们开发了一种简单的水热方法，将具有暴露的（001）面的薄TiO 2纳米片涂覆到ZnO纳米棒阵列上。由于TiO 2层的存在，ZnO纳米棒的化学稳定性得到了很大的提高。由于ZnO@TiO2纳米棒阵列的多孔结构，该薄涂层具有抗反射特性。观察到单面涂覆的FTO玻璃的透射率提高了0.5%。该涂层还表现出良好的亲水性，添加后的TiO 2纳米片。更重要的是，由于ZnO纳米棒和TiO 2纳米片之间的异质结，这些ZnO@TiO2纳米棒阵列对染料分子的降解表现出优异的光催化性能。这种异质结有利于光生载流子的电荷分离。基于上述特点，ZnO@TiO2核/壳纳米棒阵列薄膜作为自清洁涂层具有许多优点。
Nanostructured metal oxides such as ZnO and TiO2 have been extensively employed as self-cleaning coatings due to their large band gaps as well as their hydrophilic and photocatalytic properties. We have developed a simple hydrothermal method to coat thin TiO2 nanosheets with exposed (001) facets onto a ZnO nanorod array. The chemical stability of the ZnO nanorods was great improved due to the existence of the TiO2 layer. Owing to the porous structure of the ZnO@TiO2 nanorod arrays, this thin coating layer possesses anti-reflective properties. A transmittance improvement of ∼5% was observed for one-side coated FTO glass. This coating also exhibits good hydrophilic properties, after addition of the TiO2 nanosheets. More importantly, these ZnO@TiO2 nanorod arrays display excellent photocatalytic properties for the degradation of dye molecules, due to the heterojunction between the ZnO nanorods and TiO2 nanosheets. This heterojunction facilitates the charge separation of photo generated carriers. Based on the above features, the ZnO@TiO2 core/shell nanorod array film has many advantages as a self-cleaning coating.