Preparation and Characterization of Ultrathin Films Layer-by-Layer Self-Assembled from Graphite Oxide Nanoplatelets and Polymers

Cassagneau, Thierry; Guérin, and Frédéric; Fendler, János H.

doi:10.1021/la000442o

Cited by 169 publications

(91 citation statements)

References 32 publications

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“…Owing to the existence of plentiful of polar oxygencontaining functional groups on the edges and planar surfaces of the individual GO sheets, [15,16] a stable and well-dispersed GO aqueous suspension with brown color can be achieved with the aid of ultrasonication, as clearly shown in Fig. 1a.…”

Section: Resultsmentioning

confidence: 99%

A simple two-step electrochemical synthesis of graphene sheets film on the ITO electrode as supercapacitors

Liu

Wang

et al. 2011

J Appl Electrochem

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In this study, a simple and controllable two-step electrochemical process is described for the synthesis of graphene sheets (GS) film on a cleaned indium tin oxide (ITO) sheet electrode. Namely, the main procedures involve the electrophoretic deposition (EPD) of graphene oxide (GO) film onto ITO electrode and the subsequent in situ electrochemical reduction (ECR) of GO to generate GS film. X-ray photoelectron spectroscopy (XPS) measurement demonstrates that most of the oxygen-containing functional groups in GO film have been removed after ECR. By electrochemical measurements, the maximum specific capacitance of the prepared GS film electrode was calculated to be 156 F g -1 , besides, the capacitance retention of the material remained 78% after 400 times of cycling, showing a promising prospect as supercapacitor materials.

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Section: Resultsmentioning

confidence: 99%

A simple two-step electrochemical synthesis of graphene sheets film on the ITO electrode as supercapacitors

Liu

Wang

et al. 2011

J Appl Electrochem

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“…[26] Colloidal graphene oxide can be considered to have a negative surface charge due to its acidic groups, [27,28] and it can be used for constructing multilayer thin films based on electrostatic interactions. [29][30][31] Methylene blue (MB), one of the most commonly used cationic dyes, exhibits two major absorption bands at 293 (p-p*) and 664 nm (n-p*) in dilute aqueous solution, [32] and is known for its pronounced metachromatic behavior and aggregation in various solutions. [33,34] Aggregation of MB has a significant effect on its optical properties.…”

Section: Introductionmentioning

confidence: 99%

The Route to Functional Graphene Oxide

et al. 2010

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We report on an easy-to-use, successful, and reproducible route to synthesize functionalized graphite oxide (GO) and its conversion to graphene-like materials through chemical or thermal reduction of GO. Graphite oxide containing hydroxyl, epoxy, carbonyl, and carboxyl groups loses mainly hydroxyl and epoxy groups during reduction, whereas carboxyl species remain untouched. The interaction of functionalized graphene with fluorescent methylene blue (MB) is investigated and compared to graphite, fully oxidized GO, as well as thermally and chemically reduced GO. Optical absorption and emission spectra of the composites indicate a clear preference for MB interaction with the GO derivatives containing a large number of functional groups (GO and chemically reduced GO), whereas graphite and thermally reduced GO only incorporate a few MB molecules. These findings are consistent with thermogravimetric, X-ray photoelectron spectroscopic, and Raman data recorded at every stage of preparation. The optical data also indicate concentration-dependent aggregation of MB on the GO surface leading to stable MB dimers and trimers. The MB dimers are responsible for fluorescence quenching, which can be controlled by varying the pH value.

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“…GO can be prepared by the method of Brodie, Staudenmaier, and Hummers, 1 and the chemical structure of GO can be varied by controlling the degree of oxidation. 15 One can hypothesize that fire retardant efficiency can be altered according to the chemical structure of GO; however, to our best knowledge no published paper has investigated this topic. Therefore, in this study we prepared GOs with various degrees of oxidation and examined how these GO molecular structures affected its ability as a fire retardant additive in epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

Graphite oxides as effective fire retardants of epoxy resin

et al. 2011

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Graphite oxides (GOs) at various oxidation states were examined as fire retardants of epoxy resin. Excessive oxidation is detrimental to the fire retardant effect of GO because it generated a weak GO with reduced intumescent ability. GO manifested optimum fire retardant properties when it was properly oxidized due to the effective intumescence, demonstrating that intumescent GO needs to be strong enough to effectively push the epoxy resin matrix apart to cause efficient intumescence and generate a solid remnant char that acts as an efficient barrier. The fire retardant effect of GO was also reduced when a dispersion of GO in the epoxy resin was enhanced by sonication. This shows that the fine dispersion and disordering of layered structure of GO by the intercalation of epoxy molecules into the gallery of GO also reduced the intumescent ability, and the fire retardant effects of GO.

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Preparation and Characterization of Ultrathin Films Layer-by-Layer Self-Assembled from Graphite Oxide Nanoplatelets and Polymers

Cited by 169 publications

References 32 publications

A simple two-step electrochemical synthesis of graphene sheets film on the ITO electrode as supercapacitors

A simple two-step electrochemical synthesis of graphene sheets film on the ITO electrode as supercapacitors

The Route to Functional Graphene Oxide

Graphite oxides as effective fire retardants of epoxy resin

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