Solid-liquid Reaction for Synthesis of Rodlike Submicron Oxalate and the Thermolysis to Nanostrings of Co_3O_4 Nanobeads

摘要

A novel solid-liquid reaction route has been developed to synthesize rodlike submicron cobalt oxalate via dissolution of cobalt powders by oxalic acid. The rod diameter and length of the oxalate particles were found to be remarkably altered by using HCl or HNO_3 as additive. With HC1 as additive rice-shaped particles were generated while with HNO_3 slender needlelike particles were created with an average aspect ratio up to 42. Furthermore, strings of C03O4 nanobeads were obtained by calcination of the slender precursor particles in air. The CoC_2CO_4-H_2O submicron rods and C03O4 nanobeads were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TG), and X-ray diffraction (XRD).