Hybrid graphene and single-walled carbon nanotubes material in supercapacitors, field emitters and microsupercapacitors

摘要

Graphene and single-walled carbon nanotubes (SWCNTs) are two carbon materials that exhibit excellent electrical conductivities and large specific surface areas. Theoretical work suggested that a covalently bonded graphene/SWCNT hybrid material would extend those properties to three-dimensions, for use in energy storage and nanoelectronics technologies. Here we disclose a method to bond graphene and SWCNTs seamlessly during the growth stage. The hybrid material exhibits a surface area >2000 m~2/g with ohmic contact from the vertically aligned SWCNTs to the graphene. Using aberration-corrected scanning transmission electron microscopy, we observed the covalent transformation of sp~2-carbon between the planar graphene and the SWCNTs at the atomic-resolution level. These findings provide a new benchmark for understanding the three-dimensional graphene/SWCNT conjoined materials. Applications in supercapacitors, field emitters and microsupercapacitors will be discussed.