TAILIEUCHUNG - Báo cáo " Photoluminescence of ZnO nano-tetrapods "

The ZnO nano-tetrapods have been prepared by the evaporation of metallic Zn powder at the temperature range of 700oC- 950oC in air. The influence of experimental conditions, such as the evaporation temperature and the substrate temperature, on the morphology, the size and the photoluminescence (PL) was investigated. The XRD pattern showed that the nano–tetrapods were ZnO with hexagonal structure. The branch size of the tetrapods was about two hundreds nanometers. | VNU Journal of Science Mathematics - Physics 24 2008 24-29 Photoluminescence of ZnO nano-tetrapods Nguyen Thi Thuc Hien Doan Manh Ha Ngo Xuan Dai Nguyen Thi Thu Huong Department of Physics College of Science VNU 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 29 November 2007 received in revised form 13 March 2008 Abstract. The ZnO nano-tetrapods have been prepared by the evaporation of metallic Zn powder at the temperature range of 700oC- 950oC in air. The influence of experimental conditions such as the evaporation temperature and the substrate temperature on the morphology the size and the photoluminescence PL was investigated. The XRD pattern showed that the nano-tetrapods were ZnO with hexagonal structure. The branch size of the tetrapods was about two hundreds nanometers. The photoluminescence spectrum measured at room temperature consists of two bands a narrow band at 380 nm UV band and a wide band around 500 nm green band GB . The intensity of each band the ratio of the peak intensity of UV band to the GB band and the GB band position depend on the experiment conditions. However the peak position of the UV band was not changed. 1. Introduction Zinc oxide is one of the most efficient wide band-gap phosphor materials so it is attracting more attention in the field of optoelectronics and photonic devices. It has a large exciton binding energy 60 meV which allows UV lasing action to occur even at room temperature 1 . In ZnO oxygen vacancies exhibit an efficient green emission. ZnO is also one of gas-sensing materials due to advantageous features such as high sensitivity to ambient conditions low cost and simplicity in fabrication 2 . Recently the growth and elucidation of the properties of well-defined nanoscale materials are critical to efforts directed towards understanding the fundamental physics of nanostructures creating nanostructured materials and developing new nanotechnologies 3 . In this regard one-dimentional ZnO such as nanowires nanotubes .

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