For the first time, we synthesize the superconductive cobalt oxyhydrate submicron tubules by immersing γ-Na0.7CoO2 submicron tubules in aqueous KMnO4 or NaMnO4 solution without resort to the volatile and toxic Br2/CH3CN solution. The synthesized submicron tubules are characterized by X-ray diffractometer, field-emission scanning electron microscope, transmission electron microscope and superconducting quantum interference device magnetometer. All the samples are of single phase with hexagonal structure. Intercalation of water molecules into the parent compound results in an expansion of the c axis. The onset superconducting transition temperature of cobalt oxyhydrate submicron tubules is observed at about 4.07 K.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering