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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    • "The thickness of FcG, characterized by AFM (Fig. S2) was revealed to be 4.6 nme5.7 nm, roughly fitting 4e7 layers according to previous report that the thickness of single layer FcG was ~0.8 nm [5]. Fig. 3(a) shows the XRD profiles of N-FcG and S-FcG, providing information of crystallinity of FcG. "
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    ABSTRACT: In this study, we report a potentially scalable strategy for the cost/time-efficient production of water-soluble functionalized few layered graphene (FcG) through the mild defluorination of graphite fluoride (GF) at room temperature (RT). The strategy includes mechanical milling which is of high simplicity and operability, and subsequently water purification. By using heteroatom-containing alkaline such as NaNH2 and Na2S, N or S dopants can be functionalized into the defluorinated graphene, leading to the formation of N- and S-doped FcG, respectively. Our methodology of defluorination of GF allows the fabrication of water soluble FcG in much safer ways relative to the conventional Hummers' method that involves strong acidic/oxidative ambience and disposal of large amount of salt wastes. Meanwhile, the abundance of GF and the simplicity of processibility may also facilitate the practical uses of FcG obtained via our methodology.
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    • "The pyrene derivative has a strong affinity for reacting with graphene to form a stable p-stacking bond [23]. Si and Samulki introduced a small number of p-phenyl-SO 3 H groups into r-G, and reported that the sulfonated graphene can be readily dispersed in water [24]. Ruoff and coworkers indicated that anionic polymer such as poly(sodium 4-styrenesulfonate) (PSS) with negatively charged – SO 3 – groups can prevent r-G from agglomeration upon reduction by hydrazine [25] [26]. "

    Full-text · Dataset · Dec 2015
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    • "A colloidal suspension of synthesized graphene oxide in purified water was prepared by sonication of GO in water (3 mg/ml) for 3 h. Among several chemical reductants reported [26] [27] [28] [29] [30] for reduction of graphene oxide to graphene, we choose hydrazine monohydrate which is the most frequently used reductant due to its simple reduction procedure and generation of highly reduced graphene oxide with excellent physical properties [25] [31] [32]. Hydrazine monohydrate (1 ml for 3 mg of GO, 98%, Aldrich) was subsequently added to the suspension, in order to remove oxygen components by the hydrazine reduction. "
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    ABSTRACT: Electronic structure and morphology variation in a novel synthesized surface modified graphene from both experimental results and calculations based on ab-initio density functional theory results has been presented in this paper. The results indicate that modification of surface of graphene using organic molecule (thiosemicarbazide) causes sheet strain which results morphology and band structure variations. Therefore, tuning of the graphene band gap could be achieved by surface modification using organic molecule which is required in electronic device applications. Here, modified graphene is used as Mid IR detector and the results are compared with unmodified graphene-based detector. Improved detection parameters such as fast response time (three orders of magnitude faster than those reported in the literature), high sensitivity, low dark current and electrical stability are achievable for modified graphene-based fabricated detectors. These improvements are obtained because of introducing electron trapping centres and creating a bandgap in graphene through band structure engineering.
    Full-text · Article · Dec 2015 · Sensors and Actuators A Physical
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