▎ 摘　　要

Creating multifunctionality is always fascinating and required for various advance applications. We have prepared cobalt-graphene nanocomposite by co-reduction of graphite oxide and a divalent cobalt salt in water, at room temperature, by sodium borohydride. Microstructural study by high resolution transmission electron microscope (HRTEM) delineates that the nanocomposites consists of few layer of graphene sheets decorated by cobalt nanorods. The composite shows unusual photoluminescence in visible range due to defect decoration by cobalt nanorods, in spite of showing expected absorbance and magnetic properties. Functional nanomaterials with both magnetic and luminescence properties are important for application in biological systems. (C) 2016 Elsevier Ltd. All rights reserved.