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石墨烯的层间键合是一种石墨烯的改性方式, 能够改变石墨烯的机械和导电等性能, 同时也会对其热学性质产生影响. 本文采用非平衡分子动力学方法, 以层间局部碳原子sp3杂化(层间形成共价键)的双层石墨烯纳米带为研究对象, 研究了层间共价键呈链状分布时, 其浓度、角度以及拉伸应变对双层石墨烯纳米带热导率的调控, 并通过声子态密度对具有层间共价键的双层石墨烯纳米带热导率变化的原因进行机理分析. 研究发现: 双层石墨烯纳米带的热导率随层间共价键浓度的增加而减小, 且依赖于共价键链的分布角度. 随着层间共价键浓度的增加, 层间共价键链与热流方向平行时, 双层石墨烯纳米带热导率下降的速率最慢, 层间共价键链与热流方向呈现一定角度时, 热导率下降的速率变快, 且角度越大, 热导率下降的速率越快. 此外研究还发现, 拉伸应变会导致具有层间共价键的双层石墨烯纳米带的热导率进一步降低. 研究结果表明, 可以通过层间键合和拉伸应变共同对双层石墨烯纳米带的热导率进行调控. 这些结论对石墨烯基纳米器件的设计及热管控具有重要的意义.The interlayer bonding of graphene is a method of modifying graphene, which can change the mechanical property and conductivity of graphene, but also affect its thermal properties. In this paper, the non-equilibrium molecular dynamics method is used to study the thermal conductivity of bilayer graphene nanoribbon which is local carbon sp3 hybridization (covalent bond formed between layers) under different concentration and angle of interlayer covalent bond chain and different tensile strain. The mechanism of the change of the thermal conductivity of bilayer graphene nanoribbon is analyzed through the density of phonon states. The results are as follows. The thermal conductivity of bilayer graphene nanoribbon decreases with the increase of the interlayer covalent bond concentration due to the intensification of phonon scattering and the reduction of phonon group velocities and effective phonon mean free path. Moreover, the decrease rate of thermal conductivity depends on the distribution angle of covalent bond chain. With the increase of interlayer covalent bond concentration, when the interlayer covalent bond chain is parallel to the direction of heat flow, the thermal conductivity decreases slowest because the heat transfer channel along the heat flow direction is gradually affected; when the interlayer covalent bond chain is at an angle with respect to the direction of heat flow, the thermal conductivity decreases more rapidly, and the larger the angle, the faster the thermal conductivity decreases. The rapid decline of thermal conductivity is due to the formation of interfacial thermal resistance at the interlayer covalent bond chain, where strong phonon-interface scattering occurs. In addition, it is found that the thermal conductivity of bilayer graphene nanoribbon with interlayer bonding will be further reduced by tensile strain due to the intensification of phonon scattering and the reduction of phonon group velocity. The results show that the thermal conductivity of bilayer graphene nanoribbon can be controlled by interlayer bonding and tensile strain. These conclusions are of great significance in designing and thermally controlling of graphene based nanodevices.
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Keywords:
- thermal conductivity /
- bilayer graphene nanoribbon /
- interlayer covalent bond /
- molecular dynamic
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图 3 不同层间共价键浓度的模型图 (a) 层间共价键浓度为2.08%; (b) 层间共价键浓度为4.16%; (c) 层间共价键浓度为8.33%; (d) 层间共价键浓度为12.5%
Fig. 3. Snapshot of model diagram of different interlayer covalent bond concentration: (a) interlayer covalent bond concentration of 2.08%; (b) interlayer covalent bond concentration of 4.16%; (c) interlayer covalent bond concentration of 8.33%; (d) interlayer covalent bond concentration of 12.5%
图 5 (a) 不同层间共价键浓度的双层石墨烯的面内PDOS; (b) 不同层间共价键浓度的双层石墨烯的面外PDOS; (c) 相同模型共价键区域和非共价键区域的面内PDOS; (d) 相同模型共价键区域和非共价键区域的面外PDOS
Fig. 5. (a) In-plane PDOS of bilayer graphene with different interlayer covalent concentration; (b) the out-plane PDOS of bilayer graphene with different interlayer covalent concentration; (c) the in-plane PDOS of covalent and noncovalent bond regions in the same model; (d) the in-plane PDOS of covalent and noncovalent bond regions in the same model.
图 6 层间共价键链呈不同角度时的模型图 (a) 层间共价键链呈0°; (b) 层间共价键链呈30°; (c) 层间共价键链呈60°; (d) 层间共价键链呈90°
Fig. 6. Snapshot of model diagram of interlayer covalent bond chain at different angles: (a) 0° interlayer covalent bond chain; (b) 30° interlayer covalent bond chain; (c) 60° interlayer covalent bond chain; (d) 90° interlayer covalent bond chain
图 9 不同拉伸应变下具有层间共价键的双层石墨烯的面内声子态密度 (a) 层间共价键浓度为2.08%; (b) 层间共价键浓度为4.16%; (c) 层间共价键浓度为8.33%; (d) 层间共价键浓度为12.5%
Fig. 9. In-plane PDOS of bilayer graphene with interlayer covalent bonds under different tensile strains: (a) Interlayer covalent bond concentration of 2.08%; (b) interlayer covalent bond concentration of 4.16%; (c) interlayer covalent bond concentration of 8.33%; (d) interlayer covalent bond concentration 12.5% interlayer covalent bond concentration.
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[1] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666Google Scholar
[2] King A, Johnson G, Engelberg D, Ludwig W, Marrow J 2008 Science 321 382Google Scholar
[3] Novoselov K S, Morozov S V, Mohinddin T M G, Ponomarenko L A, Elias D C, Yang R, Barbolina I I, Blake P, Booth T J, Jiang D, Giesbers J, Hill E W, Geim A K 2007 Phys. Status Solidi B 244 4106Google Scholar
[4] Pop E, Varshney V, Roy A K 2012 MRS Bull. 37 1273Google Scholar
[5] Geim A K, Novoselov K S 2007 Nat. Mater. 6 183Google Scholar
[6] Wu T, Zhang X, Yuan Q, Xue J, Lu G, Liu Z, Wang H, Wang H, Ding F, Yu Q, Xie X, Jiang M 2016 Nat. Mater. 15 43Google Scholar
[7] Ghosh S, Calizo I, Teweldebrhan D, Pokatilov E P, Nika D L, Balandin A A, Bao W, Miao F, Lau C N 2008 Appl. Phys. Lett. 92 151911Google Scholar
[8] Nika D L, Ghosh S, Pokatilov E P, Balandin A A 2009 Appl. Phys. Lett. 94 203103Google Scholar
[9] Xu Y, Chen X, Gu B, Duan W 2009 Appl. Phys. Lett. 95 233116Google Scholar
[10] Hu J, Ruan X, Chen Y P 2009 Nano Lett. 9 2730Google Scholar
[11] Kong B D, Paul S, Nardelli M B, Kim K W 2009 Phys. Rev. B 80 033406Google Scholar
[12] Cao H, Guo Z, Xiang H, Gong X 2012 Phys. Lett. A 376 525Google Scholar
[13] Chien S, Yang Y, Chen C O 2011 Appl. Phys. Lett. 98 33107Google Scholar
[14] Pei Q, Sha Z, Zhang Y 2011 Carbon 49 4752Google Scholar
[15] 杨平, 王晓亮, 李培, 王欢, 张立强, 谢方伟 2012 61 076501Google Scholar
Yang P, Wang X L, Li P, Wang H, Zhang L Q, Xie F W 2012 Acta Phys. Sin. 61 076501Google Scholar
[16] Morpurgo A F, Vandersypen L M K, Oostinga J B, Heersche H B, Liu X 2008 Nat. Mater. 7 151Google Scholar
[17] Deng C C, Huang Y W, An M, Yang N 2021 Mater. Today Phys. 16 100305Google Scholar
[18] 潘东楷, 宗志成, 杨诺 2022 71 086302Google Scholar
Pan D K, Zong Z C, Yang N 2022 Acta Phys. Sin. 71 086302Google Scholar
[19] Ghosh S, Bao W, Nika D L, Subrina S, Pokatilov E P, Lau C N, Balandin A A 2010 Nat. Mater. 9 555Google Scholar
[20] Wei Z, Ni Z, Bi K, Chen M, Chen Y 2011 Carbon 49 2653Google Scholar
[21] Yu X X, Ma D K, Deng C C, Wan X, An M, Meng H, Li X B, Huang X M, Yang N 2021 Chin. Phys. Lett. 38 014401Google Scholar
[22] Li Z, Wang Y, Ma M, Ma H, Hu W, Zhang X, Zhuge Z, Zhang S, Luo K, Gao Y, Sun L, Soldatov A V, Wu Y, Liu B, Li B, Ying P, Zhang Y, Xu B, He J, Yu D, Liu Z, Zhao Z, Yue Y, Tian Y, Li X 2023 Nat. Mater. 22 42Google Scholar
[23] Peng B, Locascio M, Zapol P, Li S, Mielke S L, Schatz G C, Espinosa H D 2008 Nat. Nanotechnol. 3 626Google Scholar
[24] Kanasaki J, Inami E, Tanimura K, Ohnishi H, Nasu K 2009 Phys. Rev. Lett. 102 87402Google Scholar
[25] Kvashnin A G, Chernozatonskii L A, Yakobson B I, Sorokin P B 2014 Nano Lett. 14 676Google Scholar
[26] Rajabpour A, Vaez Allaei S M 2012 Appl. Phys. Lett. 101 53115Google Scholar
[27] Guo T, Sha Z, Liu X, Zhang G, Guo T, Pei Q, Zhang Y 2015 Appl. Phys. A 120 1275Google Scholar
[28] Yang L, Wan X, Ma D K, Jiang Y, Yang N 2021 Phys. Rev. B 103 155305Google Scholar
[29] 宗志成, 潘东楷, 邓世琛, 万骁, 杨哩娜, 马登科, 杨诺 2023 72 034401Google Scholar
Song Z C, Pan D K, Deng S C, Wan X, Yang L N, Ma D K, Yang N 2023 Acta Phys. Sin. 72 034401Google Scholar
[30] Chen Y, Wan J, Chen Y, Qin H, Liu Y, Pei Q, Zhang Y 2023 Int. J. Therm. Sci. 183 107871Google Scholar
[31] Fan L, Yao W 2021 Diamond Relat. Mater. 118 108521Google Scholar
[32] Huang Y W, Feng W T, Yu X X, Deng C C, Yang N 2020 Chin. Phys. B 29 126303Google Scholar
[33] Feng W T, Yu X X, Wang Y, Ma D K, Sun Z J, Deng C C, Yang N 2019 Phys. Chem. Chem. Phys. 21 25072Google Scholar
[34] Plimpton S 1995 J. Comput. Phys. 117 1Google Scholar
[35] Stuart S J, Tutein A B, Harrison J A 2000 J. Chem. Phys. 112 6472Google Scholar
[36] Girifalco L A, Hodak M, Lee R S 2000 Phys. Rev. B 62 13104Google Scholar
[37] Xu X F, Pereira L F C, Wang Y, Wu J, Zhang K W, Zhao X M, Bae S, Tinh Bui C T, Xie R G, Thong J T L, Hong B H, Loh K P, Donadio D, Li B W, Ozyilmaz B 2014 Nat. Commun. 5 3689Google Scholar
[38] Hao F, Fang D, Xu Z 2011 Appl. Phys. Lett. 99 041901Google Scholar
[39] Wei N, Xu L, Wang H, Zheng J 2011 Nanotechnology 22 105705Google Scholar
[40] Polanco C A, Lindsay L 2018 Phys. Rev. B 98 014306Google Scholar
[41] Dong L, Wu X S, Hu Y, Xu X F, Bao H 2021 Chin. Phys. Lett. 38 027202Google Scholar
[42] Zhu G P, Zhao C W, Wang X W, Wang J 2021 Chin. Phys. Lett. 38 024401Google Scholar
[43] Guo Z, Zhang D, Gong X 2009 Appl. Phys. Lett. 95 163103Google Scholar
[44] Meng H, Maruyama S G, Xiang R, Yang N 2021 Int. J. Heat Mass Transfer 180 121773Google Scholar
[45] Xu K, Deng S C, Liang T, Cao X Z, Han M, Zeng X L, Zhang Z S, Yang N, Wu J Y 2022 Nanoscale 14 3078Google Scholar
[46] Wang X, Demir B, An M, Walsh T R, Yang N 2021 Int. J. Heat Mass Transfer 180 121821Google Scholar
[47] Mohiuddin T M G, Lombardo A, Nair R R, Bonetti A, Savini G, Jalil R, Bonini N, Basko D M, Galiotis C, Marzari N, Novoselov K S, Geim A K, Ferrari A C 2009 Phys. Rev. B 79 205433Google Scholar
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