Xu Zhao1, Liangliang Xu1, Qiang Chen1, Qingyu Peng1,2, Minglong Yang1, Wenqi Zhao1, Zaishan Lin1, Fan Xu1, Yibin Li1,2, Xiaodong He1,2
1National Key Laboratory of Science and Technology on
Advanced Composites in Special Environments, Center for Composite
Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China
2Shenzhen STRONG Advanced Materials Research Institute Co., Ltd., Shenzhen, 518000 P. R. China
Tóm tắt
AbstractOne of the potential applications for carbon nanotube (CNT) sponge prepared through chemical vapor deposition (CVD) is as a strain sensor. However, the sensitivity of CNT sponge is strongly impeded by the point‐to‐point contact between individual CNTs. A novel method is proposed to introduce reduced graphene oxide (rGO) as a conducting bridge into CNT sponge, in order to dramatically improve the CNT contact. The graphene oxide (GO) is coated onto polystyrene (PS) spheres forming a suspension that is infiltrated into the CVD‐derived CNT sponge under vacuum. The PS spheres are decomposed and GO is reduced by postannealing. Scanning electron microscopy confirms the successful introduction of rGO. A small amount of rGO can effectively increase the electrical conductivity of the CNT sponge by ≈30% without an observable increase in density. A dramatic increment of 66% in sensitivity factor is achieved. Compared with CNT sponge, the microwave shielding effectiveness of the rGO/CNT hybrid sponge is 50% larger. This hybrid sponge is very promising for use as a high‐sensitivity strain sensor in different environments (both in the air and under water) and for high‐efficiency electromagnetic shielding protection.
