Abstract
First-principles computations revealed that iodine (I) is an ideal terminal group for zigzag graphene nanoribbons (zGNRs) in terms of stabilizing the pure sp 2 coordinated edges and preserving the edge magnetism. Due to the strong steric effect of I atoms, the unfavorable sp 3 coordination can be efficiently suppressed and the pure sp 2 coordinated edges can be stabilized at rather feasible experimental conditions. Interestingly, the electronic structures of I-terminated zGNRs (I-zGNRs) with different edge configurations can be well rationalized by employing the Clar’s model. I-zGNRs can well reproduce the electronic and magnetic properties of those hydrogen-terminated zGNRs. Remarkably, I termination can significantly lower the critical electric field required to induce the half-metallic behavior. These results open new opportunities in fabricating spintronics devices based on zGNRs.
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Support in China by startup funds of Nanjing Normal University (184080H20145) and Jiangsu Specially Appointed Professor Plan are gratefully acknowledged.
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214_2014_1548_MOESM1_ESM.doc
Clar’s representations of z 11 and z 21111 in the nonmagnetic state and z 2111 in the magnetic state, phonon spectrum of 8-I-zGNR with z 11 edge configuration, DOS of 8-H-zGNR, and band gap of I-zGNRs as a function of ribbon width. Supplementary material 1 (DOC 539 kb)
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Wang, Y., Li, Y. Preserving the edge magnetism of graphene nanoribbons by iodine termination: a computational study. Theor Chem Acc 133, 1548 (2014). https://doi.org/10.1007/s00214-014-1548-8
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DOI: https://doi.org/10.1007/s00214-014-1548-8