LOTUS SEEDPOD-BASED CARBON QUANTUM DOTS: PREPARATION, CHARACTERIZATION AND APPLICATION FOR Fe(III) DETECTION

摘要

Lotus seedpod (LS) was employed as a carbon source for the synthesis of carbon quantum dots (CQDs) using an economical and facile hydrothermal synthesis method. LS-CQDs were characterized with different techniques, including TEM, FTIR, PL, XRD, XPS, Raman spectroscopy and Uv-vis. The average particle size of LS-CQDs was found to be 2.1 +/- 0.17 nm. The properties of the excitation-dependent photoluminescence of LS-CQDs were determined, and the quantum yield was calculated to be 1.9 %. The quenching effect of LS-CQDs on Fe(III) ions was also investigated. The normalized linear relationship between the increasing Fe(III) ion concentration and the fluorescence-emission intensities of LS-CQDs was established. Furthermore, the quenching mechanism for the reaction between Fe(III) ions and LS-CQDs was elucidated.