Fabrication and Optical Behaviors of Core–Shell ZnS Nanostructures
1 Nanjing National Laboratory of Microstructures and Department of Physics, Nanjing University, 210093, Nanjing, People’s Republic of China
2 Chemistry Department, Hong Kong Baptist University, Hong Kong, People’s Republic of China
Nanoscale Research Letters 2010, 5:1124-1127 doi:10.1007/s11671-010-9612-3Published: 24 April 2010
Novel core–shell nanostructures comprised of cubic sphalerite and hexagonal wurtzite ZnS have been synthesized at 150°C by a simple hydrothermal method. The results of HR-TEM and SAED investigation reveal that the cores of hexagonal wurtzite ZnS (ca. 200 nm in average diameter) are encapsulated by a shell of cubic sphalerite ZnS. The FE-SEM image of the nanomaterials shows a surface tightly packed with nanoparticles (<10 nm in size). The optical properties of the fabricated material have been studied in terms of ultraviolet–visible absorption and photoluminescence. Furthermore, a possible mechanism for the fabrication of the core–shell nanostructures has been presented.