Abstract
A bicomponent colorimetric probe based on carbon quantum dots (CQDs) and o-phenylenediamine (OPD) was established for the detection of Cu2+. Theoretically, light-generated electrons from CQDs were trapped by the dissolved oxygen, resulting in the production of superoxide radicals. The colorless OPD was oxidized by the superoxide radicals to its yellow oxidation product (OPDox). On the other hand, Cu2+ can bind onto the surface of CQDs and change the band gap of the CQDs. This change induces an inhibition of the photo-oxidation of OPD, thus resulting in a decrease of the absorbance of OPDox. The mechanism was demonstrated by a series of control experiments. The parameters influencing the sensing performance as well as potential interferences were investigated. Under the optimum conditions, a limit of detection of 30nM was achieved. Moreover, this sensing system was applied to analyze Cu2+ in seawater and tapwater samples, and achieved satisfying results.
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.
