Solvothermal synthesis and mechanical characterization of single crystalline copper nanorings

Single crystalline copper nanorings were synthesized through the solvothermal process. The N-methyl-2-pyrrolidone (NMP)/water system is thought to be the key factor to form the novel structure, and a growth-stress induced bending mechanism is proposed to explain the formation mechanism. Micro-manipulation experiments revealed excellent mechanical properties of these copper nanorings.

► A simple solvothermal method to prepare discrete, single crystalline Cu nanorings. ► Polyvinyl acetate (PVA) selected as reductant and CuCl as copper resource. ► N-methyl-2-pyrrolidone (NMP) proved to be a key factor to form the ring structure. ► As-prepared copper nanorings show excellent mechanical properties.