Unconventional thermal conductivity of suspended zigzag graphene nanomesh
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866909992084307968 |
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| author | Yokosawa, Takamoto Matsui, Tomohiro |
| author_facet | Yokosawa, Takamoto Matsui, Tomohiro |
| contents | Compared to the study of graphene itself, the study of nano-structured graphene is rather limited because it is difficult to prepare atomically ordered edges. In this study, we have fabricated a periodically patterned mesh structure of graphene with atomically precise zigzag edges (zGNM: zigzag graphene nanomesh) and studied its thermal conductivity ($κ$) by opto-thermal Raman measurement. Unintuitively, it is found that the $κ$ of zGNM of 2,3 monolayers (MLs) thick is inversely proportional to the nanoribbon width ($W$), while that of zGNM of 5$\sim$10 MLs thick is independent of $W$ down to 30 nm. Since the $κ$ of suspended zigzag graphene nanoribbons (zGNRs) is suppressed by decreasing $W$, this nonclassical behavior of zGNM is due to the mesh structure. In addition, zGNRs show a higher $κ$ than GNRs with atomically rough edges. This is probably due to the atomically ordered zigzag edges. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_10935 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unconventional thermal conductivity of suspended zigzag graphene nanomesh Yokosawa, Takamoto Matsui, Tomohiro Mesoscale and Nanoscale Physics Materials Science Compared to the study of graphene itself, the study of nano-structured graphene is rather limited because it is difficult to prepare atomically ordered edges. In this study, we have fabricated a periodically patterned mesh structure of graphene with atomically precise zigzag edges (zGNM: zigzag graphene nanomesh) and studied its thermal conductivity ($κ$) by opto-thermal Raman measurement. Unintuitively, it is found that the $κ$ of zGNM of 2,3 monolayers (MLs) thick is inversely proportional to the nanoribbon width ($W$), while that of zGNM of 5$\sim$10 MLs thick is independent of $W$ down to 30 nm. Since the $κ$ of suspended zigzag graphene nanoribbons (zGNRs) is suppressed by decreasing $W$, this nonclassical behavior of zGNM is due to the mesh structure. In addition, zGNRs show a higher $κ$ than GNRs with atomically rough edges. This is probably due to the atomically ordered zigzag edges. |
| title | Unconventional thermal conductivity of suspended zigzag graphene nanomesh |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2601.10935 |