弯曲应力对二维石墨烯导电性能的影响

Effect of Bending Stress on the Conductive Properties of Two-Dimensional Graphene

采用化学气相沉积法生长高质量二维石墨烯,制备出石墨烯/PDMS(聚二甲基硅氧烷)和石墨烯/PET(聚对苯二甲酸乙二醇酯)柔性透明导电薄膜,用以研究不同材料及不同厚度衬底时二维石墨烯的导电性能与弯曲曲率的关系.结果表明,柔性衬底的弹性模量及厚度对二维石墨烯的导电性能影响均不大,当衬底厚度相同时,随着弯曲曲率的增加,石墨烯阻值均增加,但电阻的相对变化率较小,表明二维石墨烯导电膜可作为柔性导体应用于可弯曲触摸屏、机器人皮肤、可穿戴设备.

Chemical vapor deposition（CVD） was used to grow high-quality two-dimensional graphene, and graphene/PDMS and graphene/PET flexible transparent conductive film were prepared. These were used to study the relationship between conductivity and curvature of two-dimensional graphene in the context of different materials and different thickness of the substrate. The results show that elastic modulus and thickness of the flexible substrate have little effect on conductivity of the two-dimensional graphene. When thickness of the substrate is the same, graphene resistance increases with the increase of the bending curvature. However, the rate of relative change of graphene resistance is small, indicating that two dimensional graphene conductive films can be used as flexible conductors for bendable touching screen, robot skin, and wearable device.