Synthesis from aqueous solutions and optical properties of Ag–In–S quantum dots

Abstract

Size-selected series of Ag–In–S and Ag–In–S:Zn quantum dots (QDs) with intense broadband photoluminescence were synthesized in aqueous solutions in the presence of glutathione and mercaptoacetic acid. The bands observed in their Raman spectra are assigned to the corresponding bond vibrations. A noticeable bandgap broadening with addition of a zinc agent at the second stage of the synthesis procedure implies incorporation of Zn into the QD lattice rather than the QD surface passivation by a ZnS shell. The stability of the synthesized QD solutions during long-term storage at room temperature is discussed.