Synthesis of Copper Sulfides by Anion Substitution and their Resistive Switching Properties in the Presence of Cuprou‘s

Abstract Copper sulfides exhibit various significant physical properties and have wide potential applications. In order to synthesize copper sulfides and investigate the anion substitution possibility of Cu 3 P, we immersed Cu 3 P in sodium sulfide solution. From X‐ray diffraction spectra results, copper sulfides, namely Cu 2 S and Cu 7.2 S 4 , were observed, indicating that anion substitution between S 2− and P 3− ions did occur. Consequently, we investigated the resistive switching (RS) properties of these two phases in the presence of Cu 3 P. We found that the Cu 2 S‐Cu 3 P composite exhibited a high Off/On ratio (88) and a long retention time (>10 3 s). However, the Cu 7.2 S 4 ‐Cu 3 P composite exhibited no RS performance. In addition, we discussed the conduction and resistive switching mechanisms. Our work enriches the preparation method of copper sulfides and provides a reference for enhancing RS performance.