Abstract
In the present article, a one-pot capping method with very simple procedure was developed to synthesize highly luminescent CdTe/CdS/ZnS quantum dots (QDs). CdTe aqueous solution was introduced into a precursor solution containing Cd2+, Zn2+ and mercaptopropionic acid (MPA), and sulfur solution was then added for capping a CdS/ZnS shell on CdTe core. Synthesis conditions such as refluxing time, dropping rate of Na2S and molar ratio of Cd2+:Zn2+:S2−:MPA were investigated. The optical properties of the as-prepared QDs in absoption and photoluminescence were studied. The experimental results revealed that the CdTe/CdS/ZnS QDs prepared by the one-pot capping method had photoluminescent quantum yield up to 73%, broad excitation spectrum of 100nm, good pH tolerance and photostability. Transmission electron microscopy showed that the CdTe/CdS/ZnS QDs were nearly spherical and monodispersed with the average size of about 10nm. X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy confirmed the core/shell/shell structure of CdTe/CdS/ZnS. XRD demonstrated that the CdTe/CdS/ZnS QDs possessed ideal crystal structure.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
