그래핀 입자 구조 및 체적분율이 구리/그래핀 복합재의 전기적 특성에 미치는 영향

Abstract

Cu/graphene composites are highly electrical conductivity materials widely used in electric devices. In this paper, the effect of the structural variables of graphene platelets on electrical conductivity in Cu/graphene composite materials was evaluated by finite element analysis. Structural variables are considered for the volume fraction, aspect ratio, platelet angle, and platelet structure. The evaluations were performed in the 2 types of model, which one is a single platelet model, another is RVE model. In the single platelet model, the larger the volume fraction and the closer the angle is to 0°, the higher the electrical conductivity was deducted. And the higher aspect ratio brought about the high electrical conductivity. In the RVE model, graphene platelets are oriented uniformly or randomly in the same direction. There was little correlation between the aspect ratio and electrical conductivity in low volume fractions 0.005 and 0.01. However, the electrical conductivity of the randomly oriented RVE model was high at volume fraction of 0.02 and the aspect ratio 50 and 100. This result show that the increase of volume fraction and aspect ratio forms the conductive network which improves the electrical conductivity of the material in the randomly oriented RVE model with high volume fraction and aspect ratio.