Abstract
Health or environmental issue caused by abnormal level of metal ions like Zn 2+ or Cd 2+ is a worldwide concern. Developing an inexpensive and facile detection method for Zn 2+ and Cd 2+ is in urgent demand. Due to their super optical properties, fluorescent quantum dots (QDs) have been developed as a promising alternative for organic dyes in fluorescence analysis. In this study, a CdTe QDs-based sensitive and selective probe for Zn 2+ and Cd 2+ in aqueous media was reported. The proposed probe worked in fluorescence “turn-on” mode. The initial bright fluorescence of CdTe QDs was effectively quenched by sulfur anions (S 2−). The presence of Zn 2+ (or Cd 2+) can “turn-on” the weak fluorescence of QDs quenched by S 2− due to the formation of ZnS (or CdS) passivation shell. Under optimal conditions, a good linear relationship between the fluorescence response and concentration of Zn 2+ (or Cd 2+) could be obtained in the range from 1.6 to 35 μM (1.3–25 μM for Cd 2+). The limit of detection (LOD) for Zn 2+ and Cd 2+ were found to be 1.2 and 0.5 μM, respectively. Furthermore, the present probe exhibited a high selectivity for Zn 2+ and Cd 2+ over other metal ions and was successfully used in the detection of Zn 2+ or Cd 2+ in real water samples.
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.
