Abstract
Aqueous synthesis of glutathione-capped Ag–In–S nanocrystals (NCs) at various [Ag]:[In]:[S] molar ratios was performed under mild conditions. The average NC size is determined from X-ray diffraction data. Size-selective fractioning of the colloidal solutions is performed by repeated centrifuging with addition of 2-propanol. Based on the optical absorption and photoluminescence (PL) measurements, the dependence of the bandgap and the PL maximum position on the NC size and composition is analyzed. The analysis of the size-fractioned Ag–In–S NC Raman spectra shows that for small NCs the [Ag]/[In] ratio affects the Raman features only slightly and confirms the increase of [S]/[Ag] ratio with the decrease in NC size.
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