| Summary: | CoO/Co<sub>3</sub>O<sub>4</sub> nanoparticles (NPs) were synthesized by using a fresh egg white-assisted combustion method which acts as a new approach for green synthesis of this composite. This method was carried out by the direct heat of cobalt precursor with egg white at low temperature for very short period. In fact, this route is a novel, cheap and appropriate technique yielding nanoparticle-based materials. CoO/Co<sub>3</sub>O<sub>4</sub> nanoparticles were characterized by examining the structure and identifying the elements and determining the morphology via XRD, FTIR, SEM, EDS and TEM techniques. The sample magnetic observations were measured through the use of a vibrating sample magnetometer (VSM). The results of XRD, EDS, SEM and TEM confirmed the positive synthesis of the cubic CoO/Co<sub>3</sub>O<sub>4</sub> NPs with sponge crystals which proceed. For the as synthesized composite, 57.75 m<sup>2</sup>/g, 0.0148 cc/g and 10.31 nm were identified to be the <i>S<sub>BET</sub></i>,<i> V<sub>p</sub></i> and <i>ȓ</i>, respectively. The cobalt oxide particles in their nature were polycrystalline, and the crystallite sizes varied from 10 to 20 nm. The magnetic measurement showed that the prepared nanocomposite displays room temperature ferromagnetism with an optimum value, 3.45 emu/g, of saturation magnetization.
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