Strong, Conductive, Lightweight, Neat Graphene Aerogel Fibers with Aligned Pores
详细信息 查看全文
- 作者：Zhen Xu ; Yuan Zhang ; Peigang Li ; Chao Gao
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：August 28, 2012
- 年：2012
- 卷：6
- 期：8
- 页码：7103-7113
- 全文大小：721K
- 年卷期：v.6,no.8(August 28, 2012)
- ISSN：1936-086X
文摘
Liquid crystals of anisotropic colloids are of great significance in the preparation of their ordered macroscopic materials, for example, in the cases of carbon nanotubes and graphene. Here, we report a facile and scalable spinning process to prepare neat 鈥渃ore鈥搒hell鈥?structured graphene aerogel fibers and three-dimensional cylinders with aligned pores from the flowing liquid crystalline graphene oxide (GO) gels. The uniform alignment of graphene sheets, inheriting the lamellar orders from GO liquid crystals, offers the porous fibers high specific tensile strength (188 kN m kg鈥?) and the porous cylinders high compression modulus (3.3 MPa). The porous graphene fibers have high specific surface area up to 884 m2 g鈥? due to their interconnected pores and exhibit fine electrical conductivity (2.6 脳 103 to 4.9 脳 103 S m鈥?) in the wide temperature range of 5鈥?00 K. The decreasing conductivity with decreasing temperature illustrates a typical semiconducting behavior, and the 3D interconnected network of 2D graphene sheets determines a dual 2D and 3D hopping conduction mechanism. The strong mechanical strength, high porosity, and fine electrical conductivity enable this novel material of ordered graphene aerogels to be greatly useful in versatile catalysts, supercapacitors, flexible batteries and cells, lightweight conductive fibers, and functional textiles.