tailieunhanh - Morphology, Phase and Photoluminescence of ZnS Microstructures Grown by Thermal Deposition at Different Temperature of Substrates

ZnS microstructures were prepared by thermal evaporating ZnS powder in Ar gas ambient at atmospheric pressure. The influent of temperature at the possitions puted the silica substrates on morphology, phase and photoluminescence of ZnS was investigated. | VNU Journal of Science: Mathematics – Physics, Vol. 33, No. 4 (2017) 67-72 Morphology, Phase and Photoluminescence of ZnS Microstructures Grown by Thermal Deposition at Different Temperature of Substrates Nguyen Van Nghia1,2,*, Nguyen Duy Hung1 1 Advanced Institute of Science and Technology (AIST), Hanoi University of Science and Technology (HUST), 01 Dai Co Viet, Hanoi, Vietnam 2 Thuy Loi University, 175 Tay Son, Dong Da, Hanoi, Vietnam Received 19 July 2017 Revised 23 September 2017; Accepted 27 September 2017 Abstract: ZnS microstructures were prepared by thermal evaporating ZnS powder in Ar gas ambient at atmospheric pressure. The influent of temperature at the possitions puted the silica substrates on morphology, phase and photoluminescence of ZnS was investigated. It is clearly seen from the X-ray diffraction pattern that there is only ZnS phase with hexagonal structures at high temperature. Whereas, both ZnS and ZnO appear at lower temperature areas. The morphology of the microstructures change depending on substrate temperatures. The photoluminescence spectrum (PL) at room temperature shows that there is the shift from ultraviolet (UV) emission at high substrate temperature to strong blue emission at lower substrate temperature. The origin of these bands will be discussed in detail. Keywords: ZnS, microstructures, photoluminescence. 1. Introduction ZnS is considered as a versatile semiconductor material with exceptional physical and chemical properties. It has been extensively investigated due to its potential applications in optics, photoelectronics, sensors, catalysts and so on [1–3]. Recently, numerous efforts have been employed to control the fabrication of micro and nanostructured materials with various morphologies, since the novel properties and potential applications of nanomaterials depend sensitively on their shapes and sizes [4]. Due to the wide band gap ( eV for cubic phase and eV for hexagonal-wurtzite phase at room temperature, .