Abstract: This study uses osmanthus as a raw material to prepare a novel fluorescent material—carbon quantum dots. The composition and structure of the product were characterized through transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and fluorescence spectroscopy (FLS). The fluorescence properties and the phenomenon of metal-induced fluorescence quenching were also investigated. Based on the green and straightforward preparation of carbon quantum dots, a series of innovative, hierarchical, and gradient scientific outreach experiments were designed. Aesthetic and engaging fluorescent products were developed to demonstrate the beauty and potential applications of carbon quantum dots. These outreach experiments are both scientifically sound and engaging, enhancing students’ enthusiasm for learning while increasing the public’s understanding of and interest in chemistry.

Key words: Carbon quantum dots, Osmanthus, Preparation, Characterization, Popularization of science, Gradient