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We have theoretically investigated the electronic and magnetic properties ofgraphene whose zigzag edges are oxidized. The alteration of these properties byadsorption of $\mathrm{H_{2}O}$ and $\mathrm{NH_3}$ molecules have beenconsidered. It was found that the adsorbed molecules form a cluster along theoxidized zigzag edges of graphene due to interaction with the electro-negativeoxygen. Graphene tends to donate a charge to the adsorbates through the oxygenatoms and the efficiency of donation depends on the intermolecular distance andon the location of the adsorbed molecules relative to the plane of graphene. Itwas found that by appropriate selection of the adsorbates, a controllable andgradual growth of $p$-doping in graphene with a variety of adsorbed moleculescan be achieved.

Doping graphene by adsorption of polar molecules at the oxidized zigzag edges