THERMAL CONDUCTIVITY ANALYSIS OF DEFECTIVE GRAPHENE UNDER EXTREME ENVIRONMENTAL CONDITIONS

Abstract

This paper explores the thermal conductivity behavior of defective graphene in extreme environmental conditions, especially the synergistic effects of the structural defects, temperature changes and mechanical strain. Graphene is commonly known to have very high thermal conductivity, but its practical use is usually constrained by the existence of defects which greatly affects the heat transportation characteristics of graphene. In this study, the effects of the concentration of defects, between the cases of pristine and highly defective structures, on the phonon transport mechanisms, are systematically studied using a molecular dynamics simulation approach. The results indicate that the concentration of defects has a significant and non-linear decreasing effect on thermal conductivity caused by an increase in phonon scattering and lattice deformation. Also, external effects like high temperature and mechanical strain further impair thermal performance by increasing the phonon interaction and destabilizing the lattice. The paper also notes that tensile strain has a stronger negative impact than compressive strain, which implies that graphene thermal properties are sensitive to structural deformation.  In addition, the findings show that the interplay of defects and environmental conditions leads to complex thermal behavior, and it is important to carefully regulate material structure and operating conditions. The insights are especially applicable in designing graphene-based materials in fields like nanoelectronics, thermal management systems, and high-performance composites. In general, this study offers an in-depth insight into the heat transfer in defective graphene and offers a useful tip to the enhancement of its thermal conductivity in high technologies.