CuGaS2 quantum dots (QDs) with uniform size distribution and monodispersion were successfully synthesized by using the hot injection method. Their microstructure, energy band structure, optical properties, and photocatalytic degradation activity were systematically studied. When the reaction temperature was between 180 and 260 °C, the prepared CuGaS2 QDs exhibited a single chalcopyrite structure. The diameter increased from 5 to 18 nm, while the optical band gap decreased from 3.11 to 2.64 eV. Notably, CuGaS2 QDs synthesized at an optimal temperature of 220 °C, with a mean particle size of 8 nm, demonstrated remarkable photocatalytic activity. Under 60 min of UV-LED irradiation at 365 nm, degradation rates of 93.76% for tetracycline hydrochloride (TCH) and 22.45% for methyl orange (MO) were achieved. These results indicate the tremendous potential of CuGaS2 for water pollution remediation.
Han Boning,Yu Zengchao,Yang Yanmin,Yang Lin,Hu Fan,Li Zhiqiang,Chen Wei
CuGaS2 quantum dots (CGS QDs) with a chalcopyrite crystal structure were synthesized by a hot-injection method. The structural and optical characteristics of the obtained nanocrystals were investigated in the reaction temperature range of 210 °C to 260 °C, it was
found that the CuGaS2 QDs were governed by the surface groups functionalized with 1-dodecanethiol capping ligands in the reaction system. The appropriate reaction temperature favored the decomposition of the surface ligand. CGS QDs synthesized at 230 °C exhibited a narrow particle
size distribution and good crystallinity. In terms of the optical spectra, with an increase in the reaction temperature, the excitonic absorption peaks and band gap emission peaks were systematically red-shifted, thus exhibiting a quantum confinement effect. A mechanism for the growth and
formation of nanoparticles on the basis of the reaction temperature is proposed. Furthermore, the obtained CGS QDs showed promising visible-light-driven photocatalytic activity during degradation of rhodamine 6G.
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