Relationships of surface oxygen vacancies with photoluminescence and photocatalytic performance of ZnO nanoparticles  

作　　者：JING Liqiang YUAN Fulong HOU Haige XIN Baifu CAI Weimin FU Honggang 

机构地区：[1]The Key Laboratory of Physical Chemistry, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China [2]Department of Environmental Sciences and Engineering, Harbin Institute of Technology, Harbin 150001, China The Key Laboratory of Physical Chemistry, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China The Key Laboratory of Physical Chemistry, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China The Key Laboratory of Physical Chemistry, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China Department of Environmental Sciences and Engineering, Harbin Institute of Technology, Harbin 150001, China The Key Laboratory of Physical Chemistry, School of Chemistry and Material Sciences, Heilongjiang University, Harbin 150080, China

出　　处：《Science China Chemistry》2005年第1期25-30,共6页中国科学（化学英文版）

基　　金：the National Natural Scieance Foundation of China(Grant Nos.20171016&20301006);the Natural Science Foundation of Heilongjicmng Piovince of China(Grant No.B0305);the Science Foundati on for Excellent Youth of Heilongjiang Province of China(2002);the Supporting Plan of Education Bueau of Heilongjiang Province(Grant No.1054 G035);the Sciance Foundation of Chinese Postoctor(Grant No.20040350168); the Science Foundation for Excellent Youth of Heilongjiang Umi-versity of China(2003).

摘　　要：The ZnO nanoparticles are prepared by a precipitation process, and also are char- acterized by means of the modern testing techniques such as XPS, ESR, SPS and PL. The ac- tivity of the as-prepared ZnO is evaluated in the photocatalytic oxidation of gas phase n-C7H16. The relationships of surface oxygen vacancies (SOV) with photoluminescence (PL) and photo- catalytic performance are discussed in details. The results show that the smaller the particle size, the larger the SOV content, the stronger the PL signal, the higher the photocatalytic activity, in- dicating that the SOV, PL and photocatalytic activity have inherent relationships. This was be- cause of the reasons that the PL signal is attributed to the free and binding excitons resulting from the SOV, while the SOV is favorable for a photocatalytic oxidation reaction since the SOV can easily capture the photoinduced electrons, and the captured electrons had strong interac- tions with the adsorbed oxygen. In addition, the surface states of ZnO nanoparticles, arising from the SOV and oxygen species, are very abundant.The ZnO nanoparticles are prepared by a precipitation process, and also are char- acterized by means of the modern testing techniques such as XPS, ESR, SPS and PL. The ac- tivity of the as-prepared ZnO is evaluated in the photocatalytic oxidation of gas phase n-C7H16. The relationships of surface oxygen vacancies (SOV) with photoluminescence (PL) and photo- catalytic performance are discussed in details. The results show that the smaller the particle size, the larger the SOV content, the stronger the PL signal, the higher the photocatalytic activity, in- dicating that the SOV, PL and photocatalytic activity have inherent relationships. This was be- cause of the reasons that the PL signal is attributed to the free and binding excitons resulting from the SOV, while the SOV is favorable for a photocatalytic oxidation reaction since the SOV can easily capture the photoinduced electrons, and the captured electrons had strong interac- tions with the adsorbed oxygen. In addition, the surface states of ZnO nanoparticles, arising from the SOV and oxygen species, are very abundant.

关 键 词：ZnO  nanoparticle  oxygen vacancy  photoluminescence  photocatalysis. 

分 类 号：N[自然科学总论]