Abstract
Thermal transport properties of low-dimensional nanomaterials are highly anisotropic and sensitive to the structural disorder, which can greatly limit their applications in heat dissipation. In this work, we unveil that the carbon honeycomb structures which have high in-plane thermal conductivity simultaneously possess high axial thermal conductivity. Based on non-equilibrium molecular dynamics simulations, we find that the intrinsic axial thermal conductivity of carbon honeycomb structure reaches 746 W·m−1·K−1 at room temperature, comparable to that of good heat dissipation materials such as hexagonal boron nitride. By comparing the phonon transmission spectrum between carbon honeycombs and few layer graphene, the physical mechanism responsible for the high axial thermal conductivity of carbon honeycombs is discussed. More importantly, our simulation results further demonstrate that the high axial thermal conductivity of carbon honeycomb structure is robust to the structural disorder, which is a common issue during the mass production of the carbon honeycomb structure. Our study suggests that the carbon honeycomb structure has unique advantages to serve as the thermal management material for practical applications.
Graphical abstract
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摘要
低维纳米材料热输运性能的各向异性及其对结构无序度的高度敏感性极大限制了其在热耗散方面的应用. 我们的工作介绍了一种新型的石墨烯基三维复合材料——碳蜂巢结构.基于非**衡态分子动力学模拟, 我们发现碳蜂巢结构具有超高的轴向热输运性能, 其本征轴向热导率高达746 W·m−1·K−1这与六方氮化硼等二维材料优异的导热能力相当. 通过比较碳蜂巢结构和少层石墨烯中跨**面方向的声子透射谱, 我们揭示了碳蜂巢结构超高轴向热导率的起源. 更重要的是, 在实际材料制备过程中不可避免会引入结构的无序, 通常这会对体系的热输运性能产生极大的阻碍. 但我们的模拟结果表明, 碳蜂巢结构轴向热导率对面内结构无序度具有很**的鲁棒性, 这对于石墨烯基复合材料的实际应用具有重要意义. 因此, 这种新型的三维石墨烯基复合材料超高的轴向热输运性能和鲁棒性优势, 将为改善纳米材料多维度的热输运性能以及实际散热材料的应用发挥巨大价值.
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This study was financially supported by the grants from the National Natural Science Foundation of China (Nos. 12075168 and 11890703), the Science and Technology Commission of Shanghai Municipality (No. 21JC1405600), and the Fundamental Research Funds for the Central Universities (No. 22120220060).
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Ren, WJ., Lu, S., Yu, CQ. et al. Carbon honeycomb structure with high axial thermal transport and strong robustness. Rare Met. 42, 2679–2687 (2023). https://doi.org/10.1007/s12598-023-02314-z
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DOI: https://doi.org/10.1007/s12598-023-02314-z