Cs3Cu2Cl5NCs were prepared by introducing a new ligand,bis(2,4,4-trimethylpentyl)phosphonic acid(TMPPA),using a traditional thermal injection method.Characterization techniques such as fluorescence,ultraviolet,X-ray diffraction(XRD),and scanning electron microscopy(SEM)showed that the NCs with green fluorescence Cs3Cu2Cl5 were successfully prepared.As the Cu+in the Cs3Cu2Cl5NCs structure can be oxidized to Cu2+in the air over time,leading to the collapse of its overall structure and fluorescence quenching,it can be used as a good material for designing time sensing models.During the process of the experiment,the particle size of the ligand(TMPPA)modi-fication strategy was adjusted to achieve 24-hour time sensing,which provides a new anti-counterfeit-ing method for the field of food safety.
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