We investigate the thermal conductivity (TC) and interfacial TC (ITC) of complex graphene nanoribbons (GNRs) with homojunctions formed by two monolayer GNR regions (MRs) and one central multi-layer GNR region (CR), as well as the influences of the CR layer number and length, the MR length, the GNR width, and the temperature. We show that the ITC is always smaller than the TC, indicating the entire heat transport performance is fundamentally determined by the interfaces. The GNRs with the two-layer CR show the largest ITC, which is much greater than the GNRs with other CR layer numbers. With increasing the temperature and the CR length, the ITC will increase while the TC will decrease for the GNRs with arbitrary CR layer numbers. However, the TC and ITC show the oscillations around certain values with the increase of the GNR width, and the TC will increase with the increase of the length of the MR. In addition, the TC (ITC) in the left part of the complex GNR changes in the same pace as the TC (ITC) in the right counterpart, while the TC always changes in the pace opposite to the ITC in the left or right part of the complex GNR. Finally, we show that the ITC can be increased by placing polyethylene molecules at the interfaces. This research should be an important reference for understanding the heat transport mechanism and designing the thermal functional materials.

我们研究了具有由两个单层 GNR 区域 (MR) 和一个中央多层 GNR 区域 (CR) 形成的同质结的复杂石墨烯纳米带 (GNR) 的热导率 (TC) 和界面 TC (ITC)，以及CR 层数和长度、MR 长度、GNR 宽度和温度。我们表明 ITC 总是小于 TC，表明整个传热性能从根本上由界面决定。具有两层 CR 的 GNR 显示出最大的 ITC，远大于具有其他 CR 层数的 GNR。随着温度和 CR 长度的增加，对于具有任意 CR 层数的 GNR，ITC 将增加而 TC 将减少。然而，随着 GNR 宽度的增加，TC 和 ITC 显示出在某些值附近的振荡，并且TC会随着MR长度的增加而增加。此外，复合 GNR 左侧部分的 TC (ITC) 与右侧对应部分的 TC (ITC) 以相同的速度变化，而 TC 总是以与左侧或右侧部分的 ITC 相反的速度变化复杂的 GNR。最后，我们表明可以通过在界面上放置聚乙烯分子来增加 ITC。该研究对理解传热机理和设计热功能材料具有重要的参考价值。我们表明可以通过在界面上放置聚乙烯分子来增加 ITC。该研究对理解传热机理和设计热功能材料具有重要的参考价值。我们表明可以通过在界面上放置聚乙烯分子来增加 ITC。该研究对理解传热机理和设计热功能材料具有重要的参考价值。