Preparation of Functionalized Graphene Sheets

Špitálský, Zdenko; Danko, Martin; Mosnáček, Jaroslav

doi:10.2174/138527211795202988

Cited by 47 publications

(40 citation statements)

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“…Compared to the covalent approach, the noncovalent approach may have many cons, such as slippage of the molecules, when compared to the covalent approach. 30,31 FT-IR was used to elucidate the covalent grafting between the hydroxyl groups of N-(tert-butoxycarbonyl)aminophenol and the acyl-functionalized GO in this study. As can be seen in Figure 2a, the FT-IR spectrum of GO shows a strong absorption band at 1725 cm À1 due to the CdO stretching in the ÀCOOH groups.…”

Section: Resultsmentioning

confidence: 99%

Polyaniline-Grafted Reduced Graphene Oxide for Efficient Electrochemical Supercapacitors

et al. 2012

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An alternative and effective route to prepare conducting polyaniline-grafted reduced graphene oxide (PANi-g-rGO) composite with highly enhanced properties is reported. In order to prepare PANi-g-rGO, amine-protected 4-aminophenol was initially grafted to graphite oxide (GO) via acyl chemistry where a concomitant partial reduction of GO occurred due to the refluxing and exposure of GO to thionyl chloride vapors and heating. Following the deprotection of amine groups, an in situ chemical oxidative grafting of aniline in the presence of an oxidizing agent was carried out to yield highly conducting PANi-g-rGO. Electron microscopic studies demonstrated that the resultant composite has fibrillar morphology with a room-temperature electrical conductivity as high as 8.66 S/cm and capacitance of 250 F/g with good cycling stability.

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Section: Resultsmentioning

confidence: 99%

Polyaniline-Grafted Reduced Graphene Oxide for Efficient Electrochemical Supercapacitors

et al. 2012

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“…Graphene oxide (GO) with average particle size of 50 lm was obtained from expanded graphite (SLG TECH-NOLOGIES GMbH, Germany) by Brodie oxidation method reported in [14]. C1s XPS spectra of GO: sp2-C: 14.97%; sp3-C: 29.47%; CAOH: 39.82%; C@O: 10.75%; COOH:…”

Section: Methodsmentioning

confidence: 99%

“…Despite the number of methods for its synthesis, as-prepared graphene itself is not soluble and thus cannot be dispersed in water or any organic solvent. Suitably modified graphene nanosheets could display good solution chemistry with properties such as dispersability and solubility in water and organic solvents [14]. Therefore, hydrophilic and organophilic affinities for graphene nanosheets should be achievable through chemical functionalization.…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of nanocomposites based on PTT-block-PTMO copolymer and graphene oxide prepared by in situ polymerization

Paszkiewicz¹,

Szymczyk²,

Špitálský³

et al. 2014

European Polymer Journal

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a b s t r a c tPoly(trimethylene terephthalate-block-tetramethylene oxide) (PTT-PTMO) copolymer/ graphene oxide nanocomposites were prepared by in situ polymerization. From the SEM and TEM images of PTT-PTMO/GO nanocomposite, it can be seen that GO sheets are clearly well-dispersed in the PTT-PTMO matrix. TEM images also showed that graphene was well exfoliated into individual sheets, suggesting that in situ polymerization is a highly efficient method for preparing nanocomposites. The influence of GO on the two-phase structure, melt viscosity and mechanical properties of PTT-PTMO block copolymer was examined by using DSC, ARES rheometer and tensile tests. The DSC results imply that the introduction of GO did not affect the glass transition temperature of PTMO-rich soft phase, melting temperature of PTT hard phase and degree of crystallinity of the nanocomposites. As the graphene oxide loading in the nanocomposites increase, the enhanced Young's modulus and yield stress was observed. The tensile strength slightly increased with the increase of GO from 0 to 0.5 wt% when elongation at break was higher or comparable to the value of neat PTT-PTMO copolymer.

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“…Different from graphene, which is almost not soluble and cannot be dispersed in water or any organic solvent34, graphene oxide (GO) contains high-density oxygen functional groups, like hydroxyl and epoxy group on its basal plane, and carboxyl at its edge45. They afford GO with excellent water solubility, ease of functionalization and convenience in processing etc 68,.…”

mentioning

confidence: 99%

High-efficient Synthesis of Graphene Oxide Based on Improved Hummers Method

Zhang

Bulin

et al. 2016

Sci Rep

542

282

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As an important precursor and derivate of graphene, graphene oxide (GO) has received wide attention in recent years. However, the synthesis of GO in an economical and efficient way remains a great challenge. Here we reported an improved NaNO3-free Hummers method by partly replacing KMnO4 with K2FeO4 and controlling the amount of concentrated sulfuric acid. As compared to the existing NaNO3-free Hummers methods, this improved routine greatly reduces the reactant consumption while keeps a high yield. The obtained GO was characterized by various techniques, and its derived graphene aerogel was demonstrated as high-performance supercapacitor electrodes. This improved synthesis shows good prospects for scalable production and applications of GO and its derivatives.

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Preparation of Functionalized Graphene Sheets

Cited by 47 publications

References 0 publications

Polyaniline-Grafted Reduced Graphene Oxide for Efficient Electrochemical Supercapacitors

Polyaniline-Grafted Reduced Graphene Oxide for Efficient Electrochemical Supercapacitors

Structure and properties of nanocomposites based on PTT-block-PTMO copolymer and graphene oxide prepared by in situ polymerization

High-efficient Synthesis of Graphene Oxide Based on Improved Hummers Method

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