Kim, Kang MinLee, Jae Ah ((UT Dallas)Sim, Hyeon JunKim, Kyung-AhJalili, RouhollahSpinks, Geoffrey M.Kim, Seon Jeong2016-09-272016-09-272016-01-122040-3372http://hdl.handle.net/10735.1/5087Due to excellent electrical and mechanical properties of carbon nano materials, it is of great interest to fabricate flexible, high conductive, and shape engineered carbon based fibers. As part of these approaches, hollow, twist, ribbon, and other various shapes of carbon based fibers have been researched for various functionality and application. In this paper, we suggest simple and effective method to control the fiber shape. We fabricate the three different shapes of hollow, twisted, and ribbon shaped fibers from wet spun giant graphene oxide (GGO)/single walled-nanotubes (SWNTs)/poly(vinyl alcohol) (PVA) gels. Each shaped fibers exhibit different mechanical properties. The average specific strengthes of the hollow, twist, and ribbon fibers presented here are 126.5, 106.9, and 38.0 MPa while strain are 9.3, 13.5, and 5%, respectively. Especially, the ribbon fiber shows high electrical conductivity (524 ± 64 S cm⁻¹) and areal capacitance (2.38 mF cm⁻²).©2016 The Royal Society of Chemistry. This article may not be further made available or distributed.Carbon fibersGrapheneElectric capacitySupercapacitorsCarbon nanotubesarticleKim, Kang Min, Jae Ah Lee, Hyeon Jun Sim, Kyung-Ah Kim, et al. 2016. "Shape-engineerable composite fibers and their supercapacitor application." Nanoscale, 8 doi:10.1039/C5NR07147J