Directly Drawing Self-Assembled, Porous, and Monolithic Graphene Fiber from Chemical Vapor Deposition Grown Graphene Film and Its Electrochemical Properties

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• 作者：Xinming Li ; Tianshuo Zhao ; Kunlin Wang ; Ying Yang ; Jinquan Wei ; Feiyu Kang ; Dehai Wu ; Hongwei Zhu
• 刊名：Langmuir
• 出版年：2011
• 出版时间：October 4, 2011
• 年：2011
• 卷：27
• 期：19
• 页码：12164-12171
• 全文大小：1088K
• 年卷期：v.27,no.19(October 4, 2011)
• ISSN：1520-5827

文摘

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鈥?0 渭m 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/cm². Decorated with only 1鈥? wt % MnO₂, the graphene/MnO₂ composites exhibit remarkable enhancement of combined performance both with respect to discharge capacitance (up to 12.4 mF/cm²) 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.