Optimizing the Synthetic Conditions of "Green" Colloidal AgBiS 2 Nanocrystals Using a Low-Cost Sulfur Source.

Colloidal AgBiS 2 nanocrystals (NCs) have attracted increasing attention as a near-infrared absorbent materials with non-toxic elements and a high absorption coefficient. In recent years, colloidal AgBiS 2 NCs have typically been synthesized via the hot injection method using hexamethyldisilathiane (TMS) as the sulfur source. However, the cost of TMS is one of the biggest obstacles to large-scale synthesis of colloidal AgBiS 2 NCs. Herein, we synthesized colloidal AgBiS 2 NCs using oleylamine@sulfur (OLA-S) solution as the sulfur source instead of TMS and optimized the synthesis conditions of colloidal AgBiS 2 NCs. By controlling the reaction injection temperature and the dosage of OLA-S, colloidal AgBiS 2 NCs with adjustable size can be synthesized. Compared with TMS-based colloidal AgBiS 2 NCs, the colloidal AgBiS 2 NCs based on OLA-S has good crystallinity and fewer defects.