title: Silica-coated and annealed CdS nanowires with enhanced photoluminescence.
abstract: The CdS/SiO(2) core/shell nanowires (NWs) with controlled shell thickness were successfully synthesized and subsequently heat-treated at 500 °C. The influences of silica shell coating and annealing processes on their optical properties have been investigated. Compared with original CdS NWs, the annealed CdS/SiO(2) NWs exhibited an enhanced band-edge emission with slowed photoluminescence lifetime, while the intensity of defect emission decreased. The results were ascribed to the surface passivation and recrystallization by shell coating and annealing. We believe our finding would help improving the optical properties of semiconductor NWs, and facilitate its applications in various realms, such as nanoscale emitter, sensor, and photoelectric device.
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Liang
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Jia-Hong
authors.initials: JH
authors.lastname: Wang
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Liu
authors.forename: Zhong-Hua
authors.initials: ZH
authors.lastname: Hao
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Yu
authors.forename: Qu-Quan
authors.initials: QQ
authors.lastname: Wang
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006244:Hardness; D006358:Hot Temperature; D008163:Luminescent Measurements / Q000295:instrumentation*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D018036:Selenium Compounds / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; D012822:Silicon Dioxide; C058667:cadmium selenide