Energetics of dioxygen binding into graphene patches with various sizes and shapes |
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Authors: | Yumura Takashi Kobayashi Hisayoshi Yamabe Tokio |
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Institution: | 1Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan 2Nagasaki Institute of Applied Science, 536 Aba-machi, Nagasaki, 851-0193, Japan |
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Abstract: | Density functional theory (DFT) calculations were employed to investigate the electronic properties of an H-atom terminated graphene patch (hydrographene) smaller than a rhombic C96H26 structure with zigzag edges. Depending on shapes and sizes of hydrographenes, some hydrographenes have the triplet ground state where unpaired electrons are localized on their zigzag edges. The stability of the triplet spin state is diminished, decreasing the hydrographene sizes. The existence of the localized spin densities allows triplet dioxgen to bind into a hydrographene. According to the DFT calculations, the energetics of the dioxygen bindings is negatively influenced by downsizing hydrographenes, as well as depends on their shapes. The size-and shape-dependences of the dioxygen bindings reflect from the stability of the triplet state of a hydrographene, because its localized unpaired electrons can be utilized to be attached to an unpaired electron of triplet dioxygen. |
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Keywords: | graphene size effect edge structure density functional theory calculation PACS number(s): 73 22 -f 73 22 Pr |
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