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The use of reduced graphene oxide (rGO) as an environmentally friendly, multi-functional conductive binder is proposed as a novel strategy for manufacturing free-standing, flexible, high-performance hard carbon anodes for sodium ion batteries (NIBs). Compared with the conventional electrodes fabricated with insulating, fluorine-containing polymer binder (PVDF), the unique two-dimensional structure...
Highly compressible three-dimensional graphene aerogels with anisotropic porous structure are fabricated by directional freezing of graphene hydrogel using anisotropically grown ice crystals as templates followed by freeze–drying. The directional freezing approach endows the graphene aerogel with a high compressive strength in the axial direction and good compressibility in both axial and radial directions...
One-step direct laser writing (DLW) method has been applied to fabricate flexible and conductive graphitic porous patterns or arrays from polyimide. With assistance of electron microscopy, Raman and energy dispersive spectroscopy, X-ray scattering, and the coupled electrical and mechanical test, a systematic processing-structure-property relationship study was performed to investigate the effect of...
Mechanically drawn SWCNT thin films were prepared and systematically investigated for understanding the effect of SWCNT orientation on the piezoresistive response of SWCNT thin film based piezoresistive sensors. Through polarized Raman spectroscopy analysis and coupled electrical–mechanical test, a quantitative relationship between the piezoresistive sensitivity and SWCNT alignment order parameter...
With glass, polyaramid, nylon and polyethylene terephthalate as the fiber substrate, a continuous spray coating and winding process was developed for fabricating SWCNT-FibSen sensor – single-walled carbon nanotube (SWCNT) thin film enabled 1D fiber sensor. The microstructures of the SWCNT-FibSen and its piezoresistive behavior were respectively characterized by scanning electron microscopy and Raman...
In an investigation of structure–property–processing relationships for SWCNT thin film piezoresistive sensors, the gauge factor of the sensors for a small tensile deformation (less than 2% strain) was found to be close to unity and showed negligible dependence on the film thickness and SWCNT bundle length (L) and diameter (d). However, for a large tensile deformation (20–30% strain), the film thickness...
Pristine graphene flakes, with ∼12% monolayers, are directly exfoliated from natural graphite, and noncovalently modified by an amorphous–crystalline block copolymer, polyvinylcyclohexane-b-polyethylene-b-polyvinylcyclohexane (PVCH-b-PE-b-PVCH). The PE block selectively crystallizes on the graphene surface, while the PVCH block extends freely and stabilizes the graphene flakes in the aliphatic and...
The mechanism of carbon nanotube (CNT) alignment during stretching was examined by the in situ characterization of carbon nanotube networks (CNTNs) under tensile strains using X-ray and Raman scattering techniques. A method of quantifying the inhomogeneous alignment of macroscopic CNTNs is explored based on bulk property measurements of their electrical anisotropy and X-ray diffraction diagrams. The...
A simple method is developed to produce high-concentration organic solutions of graphene sheets noncovalently modified with poly(styrene-co-butadiene-co-styrene) (SBS). Once exfoliated from natural graphite under sonication, the graphene sheets can be stabilized by SBS through the π–π stacking with the PS chains. The PS–graphene interaction is confirmed by DSC, since the glass transition temperature...
Divalent metal ions (M 2+ , M=Cu, Ca or Mg) are used to coordinate oxidized carbon nanotubes (CNTs) and chemically modified graphene (CMG) by the oxygen-containing functional groups. Flexible and transparent conductive films of M 2+ -coordinated CNT/CMG networks are produced by spin coating. The lowest sheet resistance is 680Ω/sq at 86% transmittance. Chemical doping with SOCl ...
Two SWCNT dispersion processing techniques – microfluidization and ultrasonication– were examined using an ultracentrifuge method and simultaneous Raman scattering and photoluminescence spectroscopy. It was demonstrated that the extremely high energy dissipation rate in microfluidization facilitates the high throughput dispersion of SWCNT bundles. However, the efficiency of SWCNT bundles being separated...
Simultaneous measurements of Raman scattering and photoluminescence (PL) prove to be a powerful method for quantifying the bundling states of single-walled carbon nanotube (SWCNT). This paper presents physical analysis and experimental evidence to establish that the G-band normalized photoluminescence, which is determined from the simultaneously acquired Raman scattering and PL emission spectra, can...
Microphase-separated styrene–butadiene–styrene (SBS) triblock copolymer was utilized as a template for the selective self-assembly of polystyrene (PS)-functionalized carbon nanotubes (CNTs) in the PS phase. It was also found that PS-functionalized CNTs could be accommodated in the PS phase of SBS regardless of the molecular weight of the PS ligand. This is different from the case for assembling nanoparticles...
Five different carbon/carbon composites (C/C) have been prepared and their thermophysical properties studied. These were three needled carbon felts impregnated with pyrocarbons (PyC) of different microstructures, chopped fibers/resin carbon+PyC, and carbon cloth/PyC. The results show that the X–Y direction thermal expansion coefficient (CTE) is negative in the range 0–100 °C with values ranging from...
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