Tuning micro-wrinkled graphene films for stretchable conductors of controllable electrical conductivity

文献类型： 外文期刊

第一作者： Feng, Chunfang

作者： Feng, Chunfang;Yi, Zhifeng;Dumee, Ludovic F.;She, Fenghua;Peng, Zheng;Gao, Weimin;Kong, Lingxue;Peng, Zheng;Gao, Weimin

作者机构：

期刊名称：CARBON （ 影响因子：9.594； 五年影响因子：8.719 ）

ISSN： 0008-6223

年卷期： 2018 年 139 卷

页码：

收录情况： SCI

摘要： Accurately controlling the electrical conductivity of wrinkled graphene or graphene oxide (GO) structures is challenging due to the complex sheet-to-sheet interactions and hierarchical interactions at the nanoscale. In this paper, wrinkled GO films with predictable electrical conductivity by precisely controlling thickness ranging from 0.69 to 1.68 mu m were fabricated with a thermal process where a GO-coated polystyrene shrink film was isotropically shrunk. Theoretical and experimental results show consistent dependence of the wrinkle wavelength on the GO film thickness. Beyond a certain thickness threshold, poorly wrinkled structures were formed as GO sheets started delaminating from the shrink films. A coarse-grain molecule model based on molecular dynamic simulation principles was developed to understand the formation of the wrinkles, and establish a relationship between GO thickness and the wrinkle wavelength generated. The electrical resistance was found to decrease when the thickness of the GO films increases. The formed composite film can maintain a stable electrical conductivity after experiencing up to 1000 stretching-release cycles under 10% strain. With controllable electrical conductivity, the reported composites can offer potential applications as a strain sensor with tuneable sensing range and high durability. (C) 2018 Elsevier Ltd. All rights reserved.

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