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High-uorescence Cu/N codoped carbon quantum dots (Cu/NCQDs) were prepared by a one-step hydrothermal method using frangipani as the carbon source and copper acetate as the copper source. The Cu/NCQDs exhibited high-intensity, stable blue uorescence that is independent of the excitation wavelength. Since metronidazole can effectively quench the uorescence intensity of Cu/NCQDs, a metronidazole uorescence-detection method using Cu/NCQDs as the uorescence probe was developed, and the quenching mechanism was studied.The method has the advantages of simplicity, speed, and low cost. Besides,it has a wider linear range and detection limit. Further, the metronidazole content in actual samples was determined by this method, with good results. Statement Of NoveltyCarbon quantum dots (QDS) are uorescent carbon nanomaterials with dual advantages of both uorescent materials and nanomaterials, so they have been widely studied. In recent years, developing the concept of "green chemistry" to synthesize green carbon quantum dots has become a research hotspot, and more green carbon materials and simple and e cient synthesis methods need to be developed. Meanwhile, heteroatomic doped carbon quantum dots (QDS) have attracted much attention because of their novel optical properties, which are different from pure carbon dots. There are many researches on the doping of non-metallic elements with carbon quantum dots, but there are few reports on the doping of metallic elements, especially transition metal elements, and there is a great space for development. Based on the above research background, a one-step hydrothermal process was used to process natural biomass to obtain transition metal codoped carbon quantum dots.

High-fluorescence Cu/N codoped carbon quantum dots (Cu/NCQDs) were prepared by a one-step hydrothermal method using frangipani as the carbon source and copper acetate as the copper source. The Cu/NCQDs exhibited high-intensity, stable blue fluorescence that is independent of the excitation wavelength. Since metronidazole can effectively quench the fluorescence intensity of Cu/NCQDs, a metronidazole fluorescence-detection method using Cu/NCQDs as the fluorescence probe was developed, and the quenching mechanism was studied.The method has the advantages of simplicity, speed, and low cost. Besides,it has a wider linear range and detection limit. Further, the metronidazole content in actual samples was determined by this method, with good results.