Abstract:

A research-type comprehensive experiment was introduced:a facile microwavehydrothermal synthesis and characterization of CuInS₂/ZnS composite quantum dots (QDs). In the experiment, water-soluble CuInS₂/ZnS composite QDs were synthesized by a two-step microwavehydrothermal method using reagents of Cu²⁺, In³⁺, Zn²⁺ and S^2- with glutathione as the stabilizer. The structure of the prepared composite QDs was characterized by X-ray diffraction (XRD) and transmittance electronic microscopy (TEM), and optical properties were characterized by UV-Visible absorption spectroscopy, photoluminescence spectroscopy, fluorescence lifetime and fluorescence imaging. The effects of temperature, time and the component in the precursors on the fluorescent properties were explored. Scientific research methods and thinking ability of students are trained by designing and accomplishing the experiment.

Key words: Research-type comprehensive experiment, Microwave-hydrothermal synthesis, CuInS₂/ZnS QDs, Photoluminescence, Fluorescent life