Composites of Graphene with Large Aromatic Molecules

Su, Qi; Pang, Shuping; Alijani, Vajiheh; Li, Chen; Feng, Xinliang; Müllen, Kläus

doi:10.1002/adma.200803808

Cited by 750 publications

(553 citation statements)

References 34 publications

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“…The GO sample showed significant weight loss with an onset temperature at slightly 4100°C, which was attributed to the elimination of interlamellar water, followed by loss of oxygen from the GO platelets themselves at slightly higher temperatures. RGO Na-NH3 showed much higher thermal stability because of the more complete de-oxygenation and better graphitization with enhanced van der Waals forces between layers [34][35][36] .…”

Section: Resultsmentioning

confidence: 99%

A low-temperature method to produce highly reduced graphene oxide

et al. 2013

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Chemical reduction of graphene oxide can be used to produce large quantities of reduced graphene oxide for potential application in electronics, optoelectronics, composite materials and energy-storage devices. Here we report a highly efficient one-pot reduction of graphene oxide using a sodium-ammonia solution as the reducing agent. The solvated electrons in sodium-ammonia solution can effectively facilitate the de-oxygenation of graphene oxide and the restoration of p-conjugation to produce reduced graphene oxide samples with an oxygen content of 5.6 wt%. Electrical characterization of single reduced graphene oxide flakes demonstrates a high hole mobility of 123 cm 2 Vs À 1 . In addition, we show that the pre-formed graphene oxide thin film can be directly reduced to form reduced graphene oxide film with a combined low sheet resistance (B350 O per square with B80% transmittance). Our study demonstrates a new, low-temperature solution processing approach to high-quality graphene materials with lowest sheet resistance and highest carrier mobility.

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Section: Resultsmentioning

confidence: 99%

A low-temperature method to produce highly reduced graphene oxide

et al. 2013

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“…For the electrical conductance measurements, RG-O pellets were prepared under an ~15 ton weight for 10 s using the KBr pellet method. The enhanced electrical conductivity resulted from better graphitization of C = C π-conjugation of the graphene basal plane and the decreased defects formed within the plane of RG-O HI − AcOH compared with the nitrogen-incorporated hydrazine system 18 . 14 .…”

Section: Rg-o Powdersmentioning

confidence: 99%

“…The G-O sample showed significant weight loss with an onset temperature at slightly more than 100 °C, which was attributed to the elimination of interlamellar water, followed by loss of oxygen from the G-O platelets themselves (such as by evolution of CO and CO 2 from the sample) at slightly higher temperatures. RG-O HI-AcOH showed much higher thermal stability (weight loss of 12.05 wt% for RG-O HI-AcOH ) because of the better graphitization and deoxygenation of RG-O HI-AcOH with enhanced van der Waals forces between layers [17][18][19] .…”

Section: Rg-o Powdersmentioning

confidence: 99%

Reduced graphene oxide by chemical graphitization

et al. 2010

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Reduced graphene oxides (RG-os) have attracted considerable interest, given their potential applications in electronic and optoelectronic devices and circuits. However, very little is known regarding the chemically induced reduction method of graphene oxide (G-o) in both solution and gas phases, with the exception of the hydrazine-reducing agent, even though it is essential to use the vapour phase for the patterning of hydrophilic G-os on prepatterned substrates and in situ reduction to hydrophobic RG-os. In this paper, we report a novel reducing agent system (hydriodic acid with acetic acid (HI-AcoH)) that allows for an efficient, one-pot reduction of a solution-phased RG-o powder and vapour-phased RG-o (VRG-o) paper and thin film. The reducing agent system provided highly qualified RG-os by mass production, resulting in highly conducting RG-o HI − AcoH . moreover, VRG-o HI − AcoH paper and thin films were prepared at low temperatures (40 °C) and were found to be applicable to flexible devices. This one-pot method is expected to advance research on highly conducting graphene platelets.

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“…A variety of surface functionalization of graphene have been reported, some of which include; functionalization with aromatic molecules [24], amidiation [25], polymers and esterification of carboxylic groups in poly(vinyl alcohol) PVA [26,27], salinization with hydroxyl groups [28] and composite reinforcement [29]. However, most of these functionalization techniques distort the sp 2 structure of graphene and tend to convert it into sp 3 , leading to decrease in charge mobility and inferior electronic properties [30].…”

Section: Introductionmentioning

confidence: 99%

Functionalized graphene foam as electrode for improved electrochemical storage

Bello

Fabiane

Momodu

et al. 2014

J Solid State Electrochem

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We report on a non-covalent functionalization of graphene foam (GF) synthesised via chemical vapor deposition (CVD). The GF was treated with pyrene carboxylic acid (PCA) which acted as a source of oxygen and/ or hydroxyl groups attached to the surface of the graphene foam for its electrochemical performance improvement.The modified graphene surface enabled a high pseudocapacitive effect on the GF. A specific capacitance of 133.3 F g -1 , power density ∼145.3 kW kg -1 , and energy density ∼4.7 W h kg -1 was achieved based on the functionalized foam in 6 M KOH aqueous electrolyte. The results suggest that non-covalent functionalization might be an effective approach to overcome the restacking problem associated with graphene electrodes and also signifies the importance of surface functionalities in graphene based electrode materials.

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Composites of Graphene with Large Aromatic Molecules

Cited by 750 publications

References 34 publications

A low-temperature method to produce highly reduced graphene oxide

A low-temperature method to produce highly reduced graphene oxide

Reduced graphene oxide by chemical graphitization

Functionalized graphene foam as electrode for improved electrochemical storage

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