物理化学学报Issue(4)：783-792,10.DOI:10.3866/PKU.WHXB201502062
合成ZnO纳米阵列及刺突状CuO/ZnO异质结
Syntheses of ZnO Nano-Arrays and Spike-Shaped CuO/ZnO Heterostructure
摘要
Abstract
A low-temperature hydrothermal route was applied to fabricate ZnO nano-arrays on fluorinated tin oxide (FTO)-coated glass substrates. The effects of the molar ratios of the precursor concentrations on the ZnO nano-arrays were studied with respect to morphology, optical properties, and growth mechanism. The results show that the length reduced with the increased molar ratios of precursor concentrations, and the diameter first increased then decreased. In general, the change of optical band gap fol owed the same trend as that for the change in diameter. When the molar ratio of precursor concentrations is 5:5, the optical band gap is 3.2 eV, which is similar to the theoretical value at room temperature. We propose that the optimal molar ratio of zinc nitrate (Zn(NO3)2) to hexamethylenetetramine (HMT, C6H12N4) is 5:5 for the preparation of ZnO nano-arrays. Spike-shaped CuO/ZnO nano-arrays were also successful y synthesized using a two-step solution-system method. Field emission scanning electron microscope (FE-SEM) results show that there were a large number of copper oxide (CuO) nano-particles (NPs) deposited onto the ZnO nano-array surfaces to form spike-shaped structures. The covered CuO NPs exhibited improved photocatalytic properties over pure ZnO nano-arrays <br> under UV irradiation, and the possible photocatalytic mechanism of the CuO/ZnO nano-heterojunction was discussed in detail.关键词
ZnO纳米阵列/CuO/ZnO异质结/水热法/光学性能/摩尔比Key words
ZnO nano-array/CuO/ZnO heterostructure/Hydrothermal method/Optical property/Molar ratio分类
化学化工引用本文复制引用
李湘奇,范庆飞,李广立,黄瑶翰,高照,范希梅,张朝良,周祚万..合成ZnO纳米阵列及刺突状CuO/ZnO异质结[J].物理化学学报,2015,(4):783-792,10.基金项目
The project was supported by the High-Tech Research and Development Program of China (2009AA03Z427).国家高技术研究发展计划项目(2009AA03Z427)资助 （2009AA03Z427）
