Simple continuous-flow synthesis of Cu–In–Zn–S/ZnS and Ag–In–Zn–S/ZnS core/shell quantum dots

Abstract

We present a simple continuous-flow reaction for the synthesis of quaternary Cu–In–Zn–S/ZnS and Ag–In–Zn–S/ZnS core/shell quantum dots (QDs) using inexpensive and low-toxic precursors. The composition and band gap of Cu–In–Zn–S and Ag–In–Zn–S QDs were well controlled by changing the molar ratios of the starting materials. The PL quantum yields of Cu–In–Zn–S/ZnS core/shell quantum dots can reach as high as 40%.