Semiconductor-noble metal hybrid nanomaterials with controlled structures

摘要

We exploited a new approach to prepare nanocomposites of semiconductor and noble metal via reaction between sulfur and bimetallic nanocrystals in ODA solvent. Various nanostructures including core-shell, porous, and heterostructure can be prepared, depending on the structure of bimetallic nanocrystals. For example, core-shell (the shell metal reacts with sulfur) bimetallic nanocrystals lead to the formation of core (noble metal)-shell (semiconductor) hybrid nanocrystals (Co_xS@Au); intermetallic and alloyed nanocrystals lead to the formation of porous noble metal-semiconductor nanocrystals (Co_xS-Pt); core-shell (the core metal reacts with sulfur) bimetallic nanocrystals lead to the formation of hollow noble metal-solid semiconductor heterostructured nanocrystals (Pt-Ag2S). This approach provides a general and excellent way to produce hybrid nanomaterials.