Bulk synthesis of highly conducting graphene oxide with long range ordering

Kumar, Rachana; Naqvi, Samya; Gupta, Neha; Kumar, Gaurav; Khan, Saba Urooge; Kumar, Pramod; Rana, Aniket; Singh, Rajiv K.; Bharadwaj, Ramil; Chand, Suresh

doi:10.1039/c5ra01943e

Cited by 45 publications

(16 citation statements)

References 40 publications

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“…[1][2][3][4][5][6] The unique structure of monolayered graphene provides extraordinary electronic properties and excellent thermal and electrical conductivity. [1][2][3][4][5][6] The unique structure of monolayered graphene provides extraordinary electronic properties and excellent thermal and electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Controlling the cooperative self-assembly of graphene oxide quantum dots in aqueous solutions

2015

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Fascinating 3D cooperative self-assembly behavior was observed for 2D graphene oxide quantum dots (GOQDs) in dilute and semi dilute aqueous solutions. In addition the optical properties could be tuned by controlling the supramolecular structures. While the electrostatic interactions between the charged single sheets were assigned as the main secondary interactions that were responsible for the supramolecular fine structures, the concentration, temperature, salt concentration and pH could tune the repulsive/attractive forces and the molecular binding between the GOQD sheets. The morphological studies combined with UV-Vis and fluorescence evaluations proved that after a slow nucleation step, elongation preceded radially by H-aggregate self-association of the GOQD monomers, forming the final porous spheres by radial growth of rods. The quenching properties of the self-associated-assembled GOQDs together with the excitation wavelengths of the GOQD solutions enabled tuning of the fluorescence intensity and color of the final solutions, which could be utilized for e.g. bioimaging and smart spectroscopy. † Electronic supplementary information (ESI) available: DSC and TGA analyses, RAMAN spectroscopy, particle sizes of GOQD solutions, zeta potentials (z) of GOQD solutions, TEM images, UV-Vis transmittance, AFM images and size analysis in the dried state and uorescence spectroscopy. See

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Section: Introductionmentioning

confidence: 99%

Controlling the cooperative self-assembly of graphene oxide quantum dots in aqueous solutions

2015

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“…In fact, there have been a number of studies on the mild oxidation of graphite by varying the oxidant loading, [25][26][27][28] oxidation temperature [29][30][31][32][33] and/or oxidation time 34 in the Hummers or Brodie's method. In these studies, however, one critical concern was the demonstration of mild oxidation.…”

Section: 4mentioning

confidence: 99%

“…Thus, the observation of peaks for both graphite and graphite oxide would mean mild oxidation, while the appearance of only graphite oxide peak would indicate full oxidation. Based on such consideration, literature studies can be divided into three groups: (i) a group with both graphite and graphite oxide peaks, demonstrating mild oxidation, 27,28,30,31,34 (ii) a group with only graphite oxide peak, indicating full oxidation, 26,32,33 and (iii) a group with no XRD characterisation. 25,29 Most of the studies in the rst group employed one or two oxidation conditions for mild oxidation, with the exception of two studies which increased KMnO 4 loading, 27 or oxidation time, 34 and demonstrated mild to full oxidation based on the XRD analysis.…”

Section: 4mentioning

confidence: 99%

Few-layer-graphene with high yield and low sheet resistance via mild oxidation of natural graphite

2017

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The mild oxidation of natural graphite was obtained via the modified Hummers method by employing an oxidation temperature of 20 C and KMnO 4 loading of 2 g, while the degree of mild oxidation was controlled by varying the oxidation time from 30 to 60, 90 or 120 min. The mild oxidation of graphite was demonstrated by X-ray diffraction (XRD), along with UV-vis spectroscopy, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Then, MOG (mildly-oxidized graphite)was grafted with aryldiazonium salts of sulfonic acid (ADS) to afford good water dispersion, followed by sonication exfoliation and centrifugation to isolate the few-layer-graphene (FLG). The FLG was characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM) and Raman spectroscopy, and its sheet resistance (R s ), yield and water dispersion stability were also evaluated. The obtained FLG had low R s (3 Â 10 2 to 5.8 Â 10 4 U , À1 ), high yield (19-85%), and good stability in water (79-86% after 4 week aging).

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“…For the synthesis of highly conducting GO, a mild bulk synthesis approach was used [30]. Firstly, tattered graphite was obtained by refluxing graphite flakes in concentrated HNO3 for 24 h followed by washing with water and drying.…”

Section: Preparation Of Zno Tphs@go Based Sensormentioning

confidence: 99%

Hierarchical triple-shelled porous hollow zinc oxide spheres wrapped in graphene oxide as efficient sensor material for simultaneous electrochemical determination of synthetic antioxidants in vegetable oil

Gan

Zhao

Wang

et al. 2016

Sensors and Actuators B: Chemical

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yong Sun, Hierarchical triple-shelled porous hollow zinc oxide spheres wrapped in graphene oxide as efficient sensor material for simultaneous electrochemical determination of synthetic antioxidants in vegetable oil, Sensors and Actuators B: Chemical http://dx.Graphical abstract Highlights  A electrochemical sensor is proposed for the simultaneous detection of TBHQ and BHA.  GO−wrapped triple−shelled porous hollow ZnO spheres are used for signal enhancement.  The sensor shows high detection sensitivity and selectivity for TBHQ and BHA.  The sensor can be successfully applied to detect TBHQ and BHA in vegetable oil. 3 Abstract Hierarchical triple−shelled porous hollow zinc oxide spheres (ZnO TPHS) were conveniently synthesized via a hard template method. And the ZnO TPHS were then wrapped into graphene oxide (GO) nanosheets though electrostatic attraction after being amino−functionalized. The composition of ZnO TPHS@GO hybrid was determined using energy dispersive X−ray spectroscopic analysis, X−ray diffraction and Raman spectra. The morphology of ZnO TPHS@GO hybrid was comprised of ZnO nanoparticles and ultrathin GO nanosheets that were characterized with scanning electron microscopy and transmission electron microscopy. The porous hollow structure and intimate contact between ZnO TPHS and GO interfaces provided a large surface area and high electron transfer activity for synthetic antioxidants in an acidic electrolyte. Based on this, a novel electrochemical sensor for the simultaneous determination of tert−butylhydroquinone (TBHQ) and butylated hydroxyanisole (BHA) has been constructed using ZnO TPHS@GO as sensing material. Under optimal conditions, the developed sensor exhibited excellent electrochemical responses in the co−detection of TBHQ and BHA, with limits of detection of 0.137 and 0.0488 M (S/N = 3), respectively. Besides, the selectivity, reproducibility and application in edible vegetable oil samples were also investigated. This study proposed a novel method of fabrication of metal oxide−decorated GO−based materials for the fabrication of sensitive electrochemical sensors that met the needs of food safety control.

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Bulk synthesis of highly conducting graphene oxide with long range ordering

Cited by 45 publications

References 40 publications

Controlling the cooperative self-assembly of graphene oxide quantum dots in aqueous solutions

Controlling the cooperative self-assembly of graphene oxide quantum dots in aqueous solutions

Few-layer-graphene with high yield and low sheet resistance via mild oxidation of natural graphite

Hierarchical triple-shelled porous hollow zinc oxide spheres wrapped in graphene oxide as efficient sensor material for simultaneous electrochemical determination of synthetic antioxidants in vegetable oil

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