Characterization of copper sulfide nanostructured spheres and nanotubes synthesized by microwave-assisted solvothermal method

摘要

Copper sulfide nanostructured spheres and nanotubes were successfully synthesized, using a microwave-assisted solvothermal method, by the decomposition of [Cu(CH_3CSNH_2)_2]Cl_2 complexes, formed by the reaction of CuCl_2·2H_2O and CH_3CSNH_2 in ethylene glycol at different pH values, and identified by CHNS/O and FTIR analyses. The decrease in bonding energy of N-H revealed the coordination of copper ions and thioacetamide molecules. It was specified that nitrogen atoms of thioacetamide molecules were used to form Cu-thioacetamide complexes. XRD, SEM, TEM and SAED analyses show that the products were hexagonal CuS spheres in an extremely low pH solution, and hexagonal CuS nanotubes at a pH 13. Their Raman spectra show sharp peaks at 473 cm~(-1), identified as the S-S stretching mode of S_2 ions at the 4e sites.