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. 2015 Jul 9;5:12058. doi: 10.1038/srep12058

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(a) O₂ (O in red) adsorbed on graphene supported on Zn doped Fe/Ni (111). The adsorption energy of O₂ is around 0.42 eV. The isosurface of charge redistribution caused by O₂ adsorption is superimposed. (b,c) are side views of charge redistribution. (d) projected density of states (PDOS) of O₂ molecule before (upper) and after (lower) adsorption. The PDOS of O₂ before adsorption is calculated by putting the molecule 5 Å away from the graphene in the same supercell.