Using a fixing Cu²⁺ NP reaction on histidine modified chitosan, a novel applicable matrix was successfully prepared and investigated as a heterogeneous nanocatalyst for preparing diaryl sulfides and aryl benzyl thioethers. The Cu(II)-his@CS nanocatalyst was characterized by FT-IR, CHN, XRD, FE-SEM, TEM, EDX, ICP-AES and TG analysis. This novel copper nanocatalyst was used for two and three component C–S coupling reactions of different aryl halides. The nanocatalyst showed high catalytic activity and reusability in both reactions.