Regulating the photocatalytic activity of ZnO single crystal by constructing the interface electric field
Bulk ZnO single crystals (SCs) were obtained by the hydrothermal method.After being cutted and polished,ZnO wafers were treated by depositing Al doped ZnO thin films (AZO TFs) and H2O2,respectively.Then Atomic Force Microscope (AFM) was adopted to characterize the surface of ZnO SCs and AZO TFs.Results shown that the AZO TFs deposited on the ZnO SCs were apt to grow along c axis.Then E.coli,B.subtilis and RhB were used to characterize the photo-catalytic activity of ZnO SCs before and after being treated.Experimental results demonstrated that the photo-catalytic activity of ZnO SC was improved greatly after depositing the AZO TFs,so most bacteria were destroyed and died finally.However the ZnO SC being treated with H2O2 presented lower photo-catalytic activity than ZnO SC untreated.The degradation efficiency indeed decreased from 50.1% for ZnO SC to 29.1% for ZnO SC treated by H2O2.Therefore,we considered that the interfacial electron field (IEF) formed due to the different carrier concentration between ZnO SC and AZO TF or i-ZnO (ZnO treated by H2O2) is responsible for the improvement or decreasement.
Yonghao Wang Xiaohong Pan Qinghong Zheng Zhang Lin Feng Huang
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Fuzhou, P.R.China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
759-759
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）