Figure 6.

(a) Schematic of the effect of the ligand exchange processes at the surface of PbS used in this study. Analogous chemistry is assumed for Ag₂S surfaces, not shown here. (b) XRD patterns of the as-synthesized (13 ± 1 nm) × (9 ± 1 nm) PbS–Ag₂S NRs, the corresponding K₂Te-surface modified NRs right after the ligand exchange (PbS–Ag₂S–K ₂Te) and after annealing at 210 °C (PbS–Ag₂S–K₂Te powder); hot-pressed (HP) resulting pellet (PbS–Ag₂S–K ₂Te, HP).