▎ 摘　　要

The results of measurements of XPS spectra and magnetic properties of powder graphene/Co composite prepared by hydrogen reduction of CoCl2 center dot 6H(2)O deposited on few-layers graphene matrix are presented. XPS Co 2p measurements show two sets of 2p(3/2,1/2)-lines belonging to oxidized and metallic Co-atoms. This means that metal in composite is partly oxidized. This conclusion is confirmed by magnetic measurements which show the presence of the main (from the metal) and shifted (from the oxide) hysteresis loops. The presence of oxide layer on the metal surface prevents the metal from the full oxidation and (as shown by magnetic measurements) provides the preservation of ferromagnetic properties after long exposure in ambient air which enables the use of graphene/metal composites in spintronics devices. (C) 2015 Elsevier Ltd. All rights reserved.