Au修饰ZnO纳米带及其光催化性质研究

Research on Au-modified ZnO Nanobelts and their Photocatalytic Properties

采用离子溅射方法在ZnO纳米带表面蒸镀Au层，经过500℃退火，在样品表面形成Au纳米颗粒，通过SEM、XRD对退火后样品进行结构表征，结果表明，随着蒸镀Au量的增加，在500℃退火后的Au颗粒尺寸逐渐减小，且分布均匀。Au颗粒与ZnO纳米带接触可以形成肖特基结，肖特基结能够有效地使电子与空穴分离并且快速导出电子，所以能够有效提高光催化活性。将以上产物作为光催化剂，在紫外光照射下降解甲基橙（Methyl Orange），研究其光催化性能，与纯zn0相比，金修饰ZnO纳米带的光催化性能有明显的提高，且不同Au颗粒尺寸降解能力不同。

The Au layers were deposited on the surfaces of ZnO nanobelts by ion sputtering method. After annealing at 500℃, Au nanoparticles formed on the surfaces of samples. SEM and XRD were used to characterize the annealed sampies, the results showed that with the increasing of Au layer,the size of Au particles decreased gradually. And after annealing at 500℃,the Au particles distributed more uniformly. As a photocatalyst, the degradation of Methyl Orange under UV irradiation, compared with pure ZnO nanobe]ts, the photocatalytic properties of Au modified ZnO nanobelts had sig- nificantly improved, with the different size of Au particle, the degradation ability is different.