Synthesis of Water Soluble Graphene

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Nano Letters (Impact Factor: 13.59). 07/2008; 8(6):1679-82. DOI: 10.1021/nl080604h
Source: PubMed


A facile and scalable preparation of aqueous solutions of isolated, sparingly sulfonated graphene is reported. (13)C NMR and FTIR spectra indicate that the bulk of the oxygen-containing functional groups was removed from graphene oxide. The electrical conductivity of thin evaporated films of graphene (1250 S/m) relative to similarly prepared graphite (6120 S/m) implies that an extended conjugated sp (2) network is restored in the water soluble graphene.

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    • "However, CNT and graphene prefer to form compact structures due to the strong van der Waals interaction, thus, the surfaces of CNT or graphene are not easily accessible to electrolytes , and the ionic diffusion rate is slow [20] [21] [22] [23]. These factors will impede the performances of EDLC, especially leading to a low rate capability. "
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    ABSTRACT: A high rate capability is a primary requirement for an electric double-layer capacitor (EDLC) in practical applications, which is mainly governed by the ionic diffusion rate. Construction of the electrode structure with proper paths for the rapid transport of ions is an efficient method to facilitate the diffusion of ions in the electrode. In this study, we prepared multi-walled carbon nanotube microspheres (MWNTMS) with a stable porous structure via the spray drying method. The MWNTMS act as a local electrolyte micro-reservoir and provide stable ion transport paths in the EDLC electrode, which will facilitate the access of the electrode to the electrolyte and accelerate the diffusion rate of the ions. Using only MWNTMS as active materials, an areal capacitance of 105 mF/cm2 at 30 A/g is observed at an areal density of 7.2 mg/cm2. When the MWNTMS are combined with reduced graphene oxides (rGO) to form an rGO-MWNTMS hybrid electrode with an areal density of 3.0 mg/cm2, a high areal capacitance of 136 mF/cm2 at 100 A/g is observed. This rGO-MWNTMS-based EDLC presents a high areal power density of 1540 mW/cm2. These favorable results indicate that MWNTMS are promising materials for applications in high power supercapacitors.
    Carbon 10/2015; 92. DOI:10.1016/j.carbon.2015.04.034 · 6.20 Impact Factor
    • "Graphene is a two‐dimensional material with a one atom thick planar sheet of sp 2 ‐ bonded carbon atoms that are densely packed in a honeycomb crystal lattice. It is regarded as the thinnest material in the universe with tremendous application potential [1] [2] [3]. Graphene has attracted stronger scientific and technological interest [4] [5] [6] [7] [8] [9] [10] since the recent award of Nobel Prize in Physics in 2010 [11]. "

    Carbon Nanomaterials for Advanced Energy Systems, 10/2015: pages 191-236; , ISBN: 9781118580783
    • "In this technique, graphene layers are exfoliated by the mechanical energy provided by bath or horn sonication , which breaks the van der Waals interactions between graphene layers. At the same time, surfactant molecules are adsorbed onto the graphene layers surface and prevent their re-stacking via steric repulsions [25] [30] [31] (see Fig. 1A). The main advantage of using this approach for ECAs application is that we are able to preserve the single layer structure of graphene and prevent their re-stacking inside the nanocomposite without disturbing its structure. "
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    ABSTRACT: We report sodium dodecyl sulfate (SDS) stabilization of graphene nanosheets, with two different sizes as auxiliary fillers inside the conventional electrically conductive adhesive (ECA) composite. Using this non-covalent modification approach we were able to preserve the single-layer structure of graphene layers and prevent their re-stacking inside the composite, which resulted in a significant electrical conductivity improvement of ECAs at noticeably low filler content. Addition of 1.5 wt% small and large SDS-modified graphene into the conventional ECAs with 10 wt% silver flakes led to low electrical resistivity values of 5.5 × 103 Ω.cm and 35 Ω.cm, respectively, while at least 40 wt% of silver flakes was required for the conventional ECA to be electrically conductive. A highly conductive ECA with very low bulk resistivity of 1.6 × 10-5 Ω.cm was prepared by adding 1.5 wt% of SDS-modified large graphene into the conventional ECA with 80 wt% silver flakes which is less than that of eutectic lead-based solders.
    Carbon 09/2015; 91:188-199. DOI:10.1016/j.carbon.2015.04.039 · 6.20 Impact Factor
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