Abstract
L-cysteine (L-cys) was used to coat ZnS quantum dots (QDs), which should benefit the improvement of water solubility and photoluminescence (PL) intensity of ZnS QDs. The impact of L-cys on the performances of ZnS QDs and the corresponding mechanism were discussed. It illustrated that L-cys modification didn’t change the crystal structure of ZnS QDs, and the mean diameter was enlarged as the content of L-cys was more. The results also displayed that the water solubility and PL intensity of samples coated with L-cys was better than that of the uncoated sample. The sample exhibited the maximal emission while the weight ratio of L-cys to QDs equaled 1.4:0.5, and it was 4.5 times as strong as ZnS sample. The result of the First-principles calculations indicated that L-cys shell layer is beneficial to prolong the lifetime of photon-generated carriers at surface location, which should lead to a reduction in the nonradiative recombination on the surface, and then the PL intensity will be enhanced. This work helps to investigate the surface modification of QDs modified by other organic compounds.
Sign-in/Register to access full text options 
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.
