Urea-doped carbon dots as fluorescent switches for the selective detection of iodide ions and their mechanistic study.

ABSTRACT: A facile and green strategy for the fabrication of fluorescent urea-doped carbon dots (N-CDs) has been explored. Significantly, the fluorescent N-CDs could recognize iodide ions (I^-) with high selectivity, and their photoluminescence could be efficiently quenched by the addition of I^-. The sensitivity analysis for I^- indicated a linear relationship in the range from 12.5 to 587 μM with the detection limit as low as 0.47 μM. Furthermore, the I^- induced fluorescence (FL) quenching mechanism was investigated employing a combination of techniques, including UV-vis/fluorescence spectroscopy, Density Functional Theory (DFT) calculation, TEM and time-resolved fluorescence decay measurements. The DFT calculation results demonstrated that the amino- and a

SUBMITTER: Wang K 

PROVIDER: S-EPMC9037827 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature