The Blue–Green Fluorescent Carbon Quantum Dots Synthesized by Chaff for Curcumin Detection

The blue–green fluorescent carbon quantum dots (BG-CQDs) were successfully synthesized by one-step hydrothermal method using chaff as the only precursor. It is found that the BG-CQDs showed excellent photostability and emitted strong blue–green fluorescence under the excitation wavelength of 330[Formula: see text]nm. And this fluorescence could be effectively quenched by curcumin (CM) based on the static quenching mechanism and inner filter effects with a wider linear range of 2.50–40[Formula: see text][Formula: see text]M and a lower detection limit of 3.53[Formula: see text]nM. Consequently, a sensitive fluorescence probe of BG-CQDs was designed to detect trace CM in blood and urine samples of healthy adults with satisfactory recoveries in the range of 92.07–111.85%. The research extended the applications of biomass waste, especially in the fields of sensor and biomedical monitoring.