Liao Yulong, Que Wenxiu, Zhang Jin, Zhong Peng, Yuan Yuan, Qiu Xinku, Shen Fengyu
Electronic Materials Research Laboratory, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, People's Republic of China.
J Nanosci Nanotechnol. 2013 Feb;13(2):959-63. doi: 10.1166/jnn.2013.6027.
Fabrication and characterization of a heterojunction structured by CdS quantum dots@ZnO nanowire-array panels were presented. Firstly, ZnO nanowire-array panels were prepared by using a chemical bath deposition approach where wurtzite ZnO nanowires with a diameter of about 100 nm and 3 microm in length grew perpendicularly to glass substrate. Secondly, CdS quantum dots were deposited onto the surface of the ZnO nanowire-arrays by using successive ion layer absorption and reaction method, and the CdS shell/ZnO core heterojunction were thus obtained. Field emission scanning electron microscopy and transmission electron microscope were employed to characterize the morphological properties of the as-obtained CdS quantum dots@ZnO nanowire-array panels. X-ray diffraction was adopted to characterize the crystalline properties of the as-obtained CdS quantum dots@ZnO nanowire-array panels. Methyl orange was taken as a model compound to confirm the photocatalytic activities of the CdS shell/ZnO core heterojunction. Results indicate that CdS with narrow band gap not only acts as a visible-light sensitizer but also is responsible for an effective charge separation.
介绍了CdS量子点@ZnO纳米线阵列面板异质结的制备与表征。首先，采用化学浴沉积法制备ZnO纳米线阵列面板，其中直径约100nm、长度为3μm的纤锌矿型ZnO纳米线垂直生长在玻璃基板上。其次，采用连续离子层吸附和反应法将CdS量子点沉积在ZnO纳米线阵列表面，从而获得CdS壳/ZnO核异质结。用场发射扫描电子显微镜和透射电子显微镜表征所制备的CdS量子点@ZnO纳米线阵列面板的形貌特性。采用X射线衍射表征所制备的CdS量子点@ZnO纳米线阵列面板的晶体特性。以甲基橙为模型化合物，证实CdS壳/ZnO核异质结的光催化活性。结果表明，具有窄带隙的CdS不仅作为可见光敏化剂，而且还负责有效的电荷分离。
