title: Directly drawing self-assembled, porous, and monolithic graphene fiber from chemical vapor deposition grown graphene film and its electrochemical properties.
abstract: Integration of graphene into macroscopic architectures represents the first step toward creating a new class of graphene-based nanodevices. We report a novel yet simple approach to fabricate graphene fibers, a porous and monolithic macrostructure, from chemical vapor deposition grown graphene films. Graphene is first self-assembled from a 2D film to a 1D fiberlike structure in an organic solvent (e.g., ethanol, acetone) and then dried to give the porous and crumpled structure. The method developed here is scalable and controllable, delivering tunable morphology and pore structure by controlling the evaporation of solvents with suitable surface tension. The fibers are 20-50 μm thick, with a typical electrical conductivity of ∼1000 S/m. The cyclic voltammetric studies show typical capacitive behavior for the porous graphene fibers with good rate stability and capacitance values ranging from 0.6 to 1.4 mF/cm(2). Decorated with only 1-3 wt % MnO(2), the graphene/MnO(2) composites exhibit remarkable enhancement of combined performance both with respect to discharge capacitance (up to 12.4 mF/cm(2)) and cycling stability. This special structure could facilitate chemical doping and electrochemical energy storage and find applications in catalyst supports, sensors, supercapacitors, Li ion batteries, etc.
authors.affiliation: Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Xinming
authors.initials: X
authors.lastname: Li
authors.forename: Tianshuo
authors.initials: T
authors.lastname: Zhao
authors.forename: Kunlin
authors.initials: K
authors.lastname: Wang
authors.forename: Ying
authors.initials: Y
authors.lastname: Yang
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wei
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
authors.forename: Dehai
authors.initials: D
authors.lastname: Wu
authors.forename: Hongwei
authors.initials: H
authors.lastname: Zhu