Abstract
Although graphene is a typical two dimensional materials, it has converted to multi-dimensional materials with many unique properties. As an example, the one dimensional graphene fiber is fabricated by utilizing ionic liquid as coagulation and functional diamines as cross-linkers to connect graphene oxide layers. The fibers show excellent mechanical properties and superior electrical performance. The tensile strength of the resultant fibers reaches ~729 MPa after a super high temperature thermal annealing treatment at 2800 °C. Additionally, quasi-solid-state flexible micro-capacitors are fabricated with promising result on energy storage. The device show a specific volumetric capacity as high as ~225 F/cm3 (measured at 103.5 mA cm−3 in a three-electrode cell), as well as a long cycle life of 2000 times. The initial results indicate that these fibers will be a good candidate to replace energy storage devices for miniaturized portable electronic applications.
Highlights
Graphene is a typical two dimensional materials, it has converted to multi-dimensional materials with many unique properties
Based on the wet-spinning fiber process from the graphene oxide (GO) solution, we have measured the dimensions and thickness of the large GO sheets to determine whether the synthesized GO exhibit liquid crystalline behaviour
Those GO fiber (GOF) are strong enough to go through the coagulation bath, where the ionic liquid with organic solvent is used as a new coagulation
Summary
Graphene is a typical two dimensional materials, it has converted to multi-dimensional materials with many unique properties. The advantage of the GO fiber (GOF) is that we can adjust their mechanical and electrical properties by modifying interlayer spaces through appropriate chemical or thermal treatments to optimize the GF15 This type GF is fabricated by the standard industrial solution spinning process at a cost effective way. A recent report[18] indicates that coagulating agents can act as coordinative cross-linkers between the GOF and divalent ions (CaCl2 and CuSO4), which can partially reduce the GOF with hydroxide ions, or reduce the surface charges on the GOF by introducing positively charged molecules or polymers (hexadecyltrimethyl-ammonium bromide, CTAB; chitosan) onto the surfaces of the GO layers These coagulating agents tested inevitably require the additional use of a postdrawing process, such as rotating the coagulation stage, to uniformly orient the GOFs and maximize the packing density of the graphene layers in the GOF18–20. 1200 °C in N2 atmosphere, 2200 °C and 2800 °C in Ar atmosphere. (a,b) The photos of a knitted textile fabricated from GF-a after annealing at 2800 °C. (c) Ionic liquid as coagulants in the process of spinning GOF
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