ZnO/Cu_2O异质结纳米阵列制备及光催化性能  

Preparation and Photocatalytic Property of ZnO/Cu_2O Heterostructured Nanorod Arrays

作　　者：何祖明[1] 夏咏梅[2] 唐斌[3] 江兴方[1,3] 黄正逸[1] 

机构地区：[1]常州大学怀德学院,江苏常州213016 [2]江苏理工学院材料工程学院,江苏常州213001 [3]常州大学数理学院,江苏常州213164

出　　处：《发光学报》2017年第7期936-943,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61107055);江苏省高校自然科学研究面上项目(15KJD430004)资助~~

摘　　要：利用湿化学法在FTO玻璃基底上制备了高度规整的ZnO纳米棒阵列(ZnO NRAs),以此为衬底,采用磁控溅射法在ZnO NRAs表面沉积Cu_2O薄膜。分别用X射线衍射仪、X射线光电子能谱、扫描电镜、光致光谱、紫外可见分光光度计和电化学工作站对样品的物相、形貌、吸收光谱、光电性能进行了表征,用甲基橙(MO)模拟有机物废水研究复合材料的光催化性能。结果表明:ZnO纳米棒为六方纤锌矿结构,其直径约为80~100 nm,长约2~3μm,棒间距约100~120 nm。立方晶系的Cu_2O颗粒直径约为100~300 nm,形成致密膜层并紧密覆盖在ZnO NRAs表面上,构成ZnO/Cu_2O异质结纳米阵列(ZnO/Cu_2O HNRAs)结构。与纯ZnO NRAs和Cu_2O相比,ZnO/Cu_2O HNRAs在可见光范围内的吸收显著增强,吸收波长向可见光方向偏移。ZnO/Cu_2O HNRAs的载流子传递界面的电荷转移速度快,有效促进了光生电子和空穴的分离。在紫外-可见光照射65 min后,ZnO/Cu_2O HNRAs的降解效率为94%,分别是纯ZnO NRAs和Cu_2O的18倍和1.7倍。ZnO nanorod arrays（ZnO NRAs） on FTO-glass substrates were prepared by chemical method,then Cu2O film was deposited on ZnO NRAs surface by using magnetron sputtering method.The crystal phase,morphology,UV-Vis absorbance spectra and photoelectric property were characterized by X-ray diffraction,X-ray photoelectron spectroscope,scanning electron microscopy,photoluminescence spectroscopy,UV-Vis spectrophotometer and electrochemical workstation,respectively. The photocatalytic activity was evaluated by the photocatalytic degradation of methyl orange（MO） under UV-Vis light irradiation. The results show that ZnO NRAs are wurtzite structure phase with diameter of 80-100 nm,length of 2-3 μm,and rod interval distance of 100-120 nm. Cu2O particles are the cubic phase with grain diameter of 100-300 nm and form a dense membrane layer on ZnO NRAs,which constitutes ZnO/Cu2O heterojunction nanorod arrays（ZnO/Cu2O HNRAs）structure. Compared with pure ZnO NRAs and Cu2O film,the absorption intensity in the visibleregion of ZnO/Cu2O HNRAs is significantly enhanced and the absorption wavelength redshifts. The charge transfer speed on the carrier transmission interface of ZnO/Cu2O HNRAs is faster,contributing to the separation of photoelectrons from hole. Irradiated under UV-Vis light for 65 min,the MO degradation efficiency of ZnO/Cu2O HNRAs is 94%,18 times than that of pure ZnO NRAs and 1. 7times than that of pure Cu2O film.

关 键 词：ZNO纳米棒阵列 ZnO/Cu2O异质结纳米棒阵列 光电化学性能 光催化 

分 类 号：O643.32[理学—物理化学] O471.5[理学—化学]