Synthesis and Analysis of Zinc Copper Indium Sulfide Quantum Dot Nanoparticles

• George Lisensky ^[1] ; Ross McFarland-Porter ^[1] ; Weltha Paquin ^[1] ; Kangying Liu ^[1]
  1. [1] Beloit College

     Beloit College

     City of Beloit, Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 97, Nº 3, 2020, págs. 806-812
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Nanoparticle Zn2xCu1–xIn1–xS2 is a promising and safer alternative to lead- and cadmium-containing quantum dots. Students prepare Zn0.44Cu0.78In0.78S2 quantum dots in a one-pot synthesis without an inert atmosphere and investigate how the color, visible absorption band edge, and photoluminescence peak wavelength depend on the size of the particle. Octadecene is used as a noncoordinating solvent with a high boiling point. Oleic acid and stearic acid are used as ligands to dissolve the metal salts in the solvent at ∼150 °C. Dodecanethiolate coordinates to the metal ion, and above 200 °C, the metal thiolate decomposes to produce metal sulfide nanoparticles, coated in dodecanethiolate. Samples are withdrawn from the hot solution and quenched at room temperature to produce a series of increasing nanoparticle sizes with the same chemical composition.