New method for fabricating nano oxide materials

M El-Hofy, M G El-Roby and M Elkhatib

Abstract

Nano Co₃O₄ has been fabricated by co-precipitation of 0.1 M cobalt chloride with 0.1 M oxalic acid. During precipitation, high-frequency signal (9 V) was applied to the precipitation bath. Three samples were prepared at three different frequencies (0 Hz, 400 KHz, 1 MHz). The samples were dried at 120 °C for 20 h, and then calcined at 700 °C for 5 h to obtain the nano Co₃O₄. The prepared samples were investigated via XRD and TEM studies. According to the present data the particle size decreases from about 164 to 80 nm and the width of the particle size distribution decreases to half of its value with increasing frequency from 0 Hz to 1 MHz