Yang Yi, Zhong Dan, Liu Yilun, Meng Donghui, Wang Lina, Wei Ning, Ren Guohua, Yan Rongxin, Kang Yang
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F (Agriculture and Forestry) University, Yangling 712100, China.
Zhuhai Da Hengqin Science and Technology Development Co. Ltd., Hengqin New Area, Zhuhai 519000, China.
Nanomaterials (Basel). 2020 Feb 7;10(2):285. doi: 10.3390/nano10020285.
As a derivative material of graphene, graphene oxide films hold great promise in thermal management devices. Based on the theory of Fourier formula, we deduce the analytical formula of the thermal conductivity of graphene oxide films. The interlaminar thermal property of graphene oxide films is studied using molecular dynamics simulation. The effect of vacancy defect on the thermal conductance of the interface is considered. The interfacial heat transfer efficiency of graphene oxide films strengthens with the increasing ratio of the vacancy defect. Based on the theoretical model and simulation results, we put forward an optimization model of the graphene oxide film. The optimal structure has the minimum overlap length and the maximum thermal conductivity. An estimated optimal overlap length for the GO (graphene-oxide) films with degree of oxidation 10% and density of vacancy defect 2% is 0.33 μm. Our results can provide effective guidance to the rationally designed defective microstructures on engineering thermal transport processes.
作为石墨烯的衍生材料，氧化石墨烯薄膜在热管理器件中具有巨大潜力。基于傅里叶公式理论，我们推导了氧化石墨烯薄膜热导率的解析公式。利用分子动力学模拟研究了氧化石墨烯薄膜的层间热性能。考虑了空位缺陷对界面热导的影响。氧化石墨烯薄膜的界面传热效率随空位缺陷比例的增加而增强。基于理论模型和模拟结果，我们提出了氧化石墨烯薄膜的优化模型。最优结构具有最小的重叠长度和最大的热导率。对于氧化度为10%、空位缺陷密度为2%的氧化石墨烯（GO）薄膜，估计的最优重叠长度为0.33μm。我们的结果可为工程热传输过程中合理设计缺陷微结构提供有效指导。
Zotero 插件