Optical properties and photocatalytic activity of Nd-doped ZnO powders

钕掺杂氧化锌粉末的光性能和光催化性能(英文)

To improve the photocatalytic activity of zinc oxides, ZnO powders doped with different neodymium （Nd） concentrations were prepared via hydrothermal method. X-ray diffraction （XRD） together with X-ray photoelectron spectroscopy （XPS） patterns revealed that Nd atoms were successfully incorporated into the ZnO lattice. XRD pattern also showed some anisotropy of the powders. The photoluminescence （PL） spectrum demonstrated a strong and broad peak in the visible light region, and the intensity of visible light emission was enhanced by Nd-doping. The photocatalytic activity was evaluated by the degradation of methyl orange solution. It is shown that doping of Nd into ZnO induces an increase of the photocatalytic activity and it attains to optimum at 3% （mole fraction） doping concentration. The intense visible light emission and the enhanced photocatalytic activity were explained by the increase in electron hole pairs and induced defects like antisite oxygen Ozn and interstitial oxygen Oi, due to the doping of Nd.

为了提高氧化锌(ZnO)的光催化性能,通过水热法制备了不同钕(Nd)掺杂量的ZnO。X射线衍射分析(XRD)和光电子能谱(XPS)测试说明钕原子成功地掺杂进入了ZnO晶格。XRD图谱还说明了粉末具有各向异性。光致发光(PL)图谱在可见光区域出现较宽范围的强峰。Nd掺杂使得可见光发射强度增强。光催化性能通过降解甲基橙溶液进行测试。研究发现Nd掺杂使得氧化锌的光催化性能得到提高,当掺杂Nd的摩尔分数为3%时,其光催化性能最佳。Nd掺杂引起的电子空穴对的增加以及诱导产生的置换氧缺陷(OZn)和间隙氧缺陷(Oi)使得可见光发射增强和光催化性能得到提高。