ZnO/In_2O_3纳米异质结的合成及其光催化性能的研究  

Synthesis and Photocatalytic Properties of ZnO/In_2O_3 Heteronanostructures

作　　者：何霞[1,2] 刘海瑞[1,2] 董海亮[1,2] 梁建[1,2] 张华[1,2] 许并社[1,2] 

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,太原030024 [2]太原理工大学材料科学与工程学院,太原030024

出　　处：《无机材料学报》2014年第3期264-268,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(51002102);山西省自然科学基金(2012011046-7)~~

摘　　要：通过热水解法成功制备出了形貌均一的ZnO/In2O3异质结光催化材料, 采用场发射扫描电子显微镜（FESEM）、X射线衍射仪（XRD）以及透射电子显微镜（TEM）对样品的形貌及结构进行表征。结果表明： ZnO/In2O3异质结是由直径约200-300 nm、厚度约40-60 nm的六边形纳米片镶嵌着In2O3纳米小颗粒组成。对比纯ZnO、纯In2O3和该光催化材料对罗丹明B（RhB）的可见光降解效率, 发现ZnO/In2O3异质结光催化材料对RhB具有较高的光催化效率, 其原因是窄带系半导体In2O3能够有效地吸收可见光, 当ZnO与In2O3形成异质结时, In2O3能带上被可见光激发的电子会迁移到ZnO的导带上, 而光激发的空穴仍保留在In2O3价带, 这样有助于光生电子和空穴的分离, 降低其复合几率, 从而有效地提高了ZnO的光催化效率。Homogeneous ZnO/In2O3 heteronanostructure photocatalytic materials were successfully synthesized by a pyrohydrolytic method. The structures and morphologies of ZnO/In2O3 heterostructure were investigated by field emission scanning electron microscope （SEM）, transmission electron microscope （TEM） and X-ray diffraction （XRD）. Results indicate that ZnO/In2O3 heterostructures consist of hexagon nanosheet ZnO with diameter of about 200-300 nm and thickness of 40-60 nm decorated with In2O3 nanoparticles. Compared with the degradation efficiency of RhB by pure ZnO, pure In2O3 and ZnO/In2O3, the results show that ZnO/In2O3 heterostructure photocatalysts possess higher photocatalytic efficiency. The enhanced photocatalytic activity is mainly attributed to the role of narrow-band semiconductor In2O3, which could effectively absorb visible light. Photo-excited electrons of In2O3’s energy band remove to conduction band of ZnO, while photo-excited holes still remain in In2O3’s valence band, which contributes to the separation of photo-generated electrons and holes, decreases recombination probability, and thus improves the photocatalytic efficiency.

关 键 词：ZNO ZNO IN2O3 罗丹明B 光催化效率 

分 类 号：O643[理学—物理化学]