摘要
石墨烯性能优异,应用前景广阔,是当今国际科技研究前沿之一。目前已有不少文献对石墨烯进行了研究,但对其热力学性质的研究还不深入和系统,尤其是对其非简谐特征的研究很少。深入和系统地研究石墨烯热力学性能的非简谐效应,确定它的热膨胀和热容量以及热导率随温度的变化规律,是目前的首要任务。石墨烯的热膨胀、蓄热和导热性是非简谐效应最明显的性能,在超薄型高蓄热材料及可调节热管理系统等中有广泛应用。如何从实验和理论方面来确定这些性能随温度的变化规律,目前尚未得到解决。从理论上确定石墨烯热膨胀系数、热容量以及热导率随温度的变化规律并探讨出其非简谐效应,是当今研究的焦点。本文提出了研究固体材料性质变化规律的非简谐效应理论方法,即通过严密的数学推导和数理论证来确定材料性质随温度的变化规律。为了确定石墨烯热膨胀系数、热容量以及热导率随温度的变化规律,需建立合理的物理模型,确定石墨烯的特性函数自由能。本文在石墨烯热膨胀、热容量和热导率的研究基础上,用固体物理理论,得到石墨烯低温热膨胀系数和热容量以及热导率随温度变化规律的解析式,计算并分析这些热力学量随温度变化的特点,探讨了原子非简谐振动对它们的影响,并与实验和其他文献的研究结果相比较。结果表明:石墨烯有低温负热膨胀现象,具有超高热传导性和大热容量蓄热、传热性能;温度愈高,非简谐效应愈突出;通过建立合理的物理模型并确定材料的特性函数自由能,可以较简便地探讨材料热力学性质随温度的变化规律和非简谐效应,其结果接近于实验结果。本文综述了非简谐效应理论在研究石墨烯热膨胀和热容量以及热传导性能上的研究现状和笔者近期的研究成果,并对石墨烯后期的发展方向作出预测。在简�
Graphene is one of the frontiers of international scientific and technological research because of its excellent properties and wide application prospects.At present,it has been researched in many literatures,but the thermodynamic properties of graphene have not been researched completely and systematically,especially,the anharmonic characteristics of graphene.It is an unsolved problem to research the anharmonic effect of graphene thermodynamic performance in depth and systematically for determine the law of thermal expansion,thermal capacity and thermal conductivity varying with temperature.For graphene,its thermal expansion,heat storage and thermal conductivity are correlated to the non-harmonic vibrational effects,and it has been widely used in ultra-thin high-heat storage materials and adjustable thermal management systems.How to determine their variation with temperature from experiment and theory has been researched in many literatures,however this problem has not been solved.How to determine theoretically the law of graphene thermal expansion coefficient,thermal capacity and thermal conductivity changing with temperature,and further to explore the anharmonic effect is the focus of current research.We propose the research method of anharmonic effect theory to study the law of solid material property change is an effective method.The theory can determine the law of material property change with temperature by rigorous mathematical deduction and mathematical theoretical reasoning.In order to determine the variation of thermal expansion coefficient,thermal capacity and thermal conductivity of graphene,establish reasonable physical model,and determine the free energy of characteristic function.On the basis of literature review the research status of graphene thermal expansion,thermal capacity and thermal conductivity,the analytical formulas of graphene thermal expansion coefficient at low temperature,thermal capacity and thermal conductivity varying with temperature are obtained by using solid state physics the
作者
程正富
周明军
杨邦朝
郑瑞伦
CHENG Zhengfu;ZHOU Mingjun;YANG Bangchao;ZHEN Ruilun(College of Electronic and Electrical Engineering,Chongqing University of Arts and Sciences,Chongqing 402160,China;The 49th Research Institute of China Electronics Technology Corporation,Harbin 150001,China;College of Electronic Science and Technology,University Electronic Science Technology of China,Chengdu 610054,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第9期95-100,共6页
Materials Reports
基金
国防工局可靠性项目(JSZL2014210B007)
重庆市基础与前沿研究项目资助(cstc2015jcyjA40054)。
关键词
非简谐效应
石墨烯
低温热膨胀
热容量
热传导
non-harmonic effect
graphene
low temperature thermal expansion
heat capacity
heat conduction
