由于优异的力学、热学、电学等特性，石墨烯/高分子基纳米复合材料具有广阔的应用前景，尤其是在纳米电子器件及传感器领域。在纳米复合材料的应用中，无论是为了提高热学性能，还是为了缓解热失配，都需要对其热膨胀特性进行全面深入的研究和掌握。本项目旨在利用跨尺度模型模拟石墨烯/高分子基纳米复合材料的热膨胀系数（CTE）、热应力场，并研制超高性能温度传感器。首先，通过分子动力学（MD）模拟获得石墨烯单体的CTE。其次，结合由此获得的单体CTE，对石墨烯/高分子基纳米复合材料的热膨胀系数和热应力场进行跨尺度模拟，并通过理论和实验方法验证模拟结果。最后，研制石墨烯/高分子基纳米复合材料超高性能温度传感器，并进行实际性能评价和工作机理分析。研究成果将揭示石墨烯/高分子基纳米复合材料的热膨胀特性和机理，为高性能石墨烯/高分子基纳米复合材料电子器件和传感器的设计提供指导。

Due to the superior mechanical, electrical and thermal properties, graphene/polymer nanocomposites have many potential applications, especially in the areas of nanoelectronics and sensors. However, to improve their thermal performance or alleviate thermal mismatch in the applications of nanocomposites, their thermal expansion property is a key factor that should be studied and handled. This project aims at simulating the coeffieicent of thermal expansion (CTE) and thermal stress of graphene/polymer nanocomposites through multi-scale (MS) numerical modeling and developing temperature sensors with ultrahigh performance. Firstly, the CTE of graphene will be predicted through molecular dynamics (MD) simulation. Secondly, based on the derived CTE of graphene, the CTE and thermal stress of graphene/polymer nanocomposites will be evaluated by MS numerical simulation, and the numerical results will be verified theoretically and experimentally. Finally, the development of an utrahigh performance temperature sensor using graphene/polymer nanocomposites will be studied, and the actual performance and working mechanism of the sensor will be verified and analyzed. The outcomes of this project will reveal the thermal expansion charactersitics and mechnisms of graphene/polymer nanocomposites, which can be very helpful for the design of ultrahigh performance nanoelectronics and sensors by using graphene/polymer nanocomposites.