Effect of nitrogen doping on the photocatalytic properties of ZnO nanorods

• Main Authors: HUANG, HEI-YUAN, 黃慧遠
• Other Authors: WANG, YAO-TE
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/e5n94k

碩士 === 國立臺北科技大學 === 光電工程系 === 107 === In this research, we used Metal-Organic Chemical Vapor deposition to grow ZnO nanorods. With Zn(C2H7O2)2 powder as the source, the Oxygen and Nitrogen were used to be the reaction gas and carrier gas. The ZnO nanorods were grown on Si (100) substrate. After the ZnO nanorods were grown, we annealed them in the Ammonia environment and nitrogen was doped with various concentrates into the nanorods in order to investigate the photocatalytic properties. The geometry of the nitrogen doped on nanorods were measured by scanning electron microscope (SEM). The electrical properties were measured by van der pauw and Hall effect measurement system. The crystallinity and crystal phase of the synthesized products were analyzed by X-ray diffraction and the optical properties were characterized by photoluminescence (PL) spectra. The photocatalytic activity of nitrogen doped ZnO nanorods were evaluated by measuring photocatalytic degradation of Methyl Orange in water under the illumination of UVA light. All the observed absorption spectra exhibit the maximum absorption at 465 nm by micro-spectrometer. Our results showed that the degradation rate increased as the carrier concentration of ZnO nanorods increased. When the ZnO nanorods were annealed in ammonia atmosphere of less than 100ml, the ZnO nanorods degradation rate increased as the concentration increased and band gap reduced. On the contrary, annealing under more than 100ml ammonia atmosphere reduced the concentration of the carrier, increased the energy gap, and further reduced the efficiency of degrading rate.