Reduction of graphene oxide nanosheets by natural beta carotene and its potential use as supercapacitor electrode

Zaid, Rubaiyi M.; Chong, Fui Chin; Ng, Eng-Poh; Chong, Kwok Feng

doi:10.1016/j.arabjc.2014.11.036

Cited by 36 publications

(11 citation statements)

References 38 publications

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“…Reinforcement of nanofillers into the polymer matrix is being used to enhance the physicochemical properties of the host polymer. For the improvement of polymer stability, carbonaceous nanoparticles such as graphene, fullerenes, carbon nanotubes, and carbon nanofibers have been widely utilized by reinforcement into the polymer matrix [1][2][3][4]. Recently, graphene based nanofillers have been applied in fuel cells, electrochromic devices, lithium-ion batteries, conducting electrodes, ultracapacitors, solar cells, and chemical sensors, due to their electronic structure, thermomechanical properties, and homogeneous dispersion in the host polymers.…”

Section: Introductionmentioning

confidence: 99%

Green Route Fabrication of Graphene Oxide Reinforced Polymer Composites with Enhanced Mechanical Properties

Mahendran

Sridharan

Santhakumar

et al. 2016

Journal of Nanoscience

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A facile and “Green” route has been applied to fabricate graphene oxide (GO) reinforced polymer composites utilizing “deionized water” as solvent. The GO was reinforced into water soluble poly(vinyl alcohol) (PVA) and poly-2-acrylamido-2-methyl-1-propanesulfonic acid (PAMPS) matrix by ultrasonication followed by mechanical stirring. The incorporation and dispersion of the GO in the polymer matrix were analyzed by XRD, FE-SEM, AFM, FT-IR, and TGA. Further, the FE-SEM and AFM images revealed that the surface roughness and agglomeration of the GO in the polymer matrix increased by increasing its concentration. Ionic exchange capacity, proton conductivity, and tensile texture results showed that the reinforcement of GO in the polymer matrix enhances the physicochemical properties of the host polymer. These PVA/PAMPS/GO nanocomposites showed improved mechanical stability compared to the pristine polymer, because of strong interfacial interactions within the components and homogeneous dispersion of the GO sheets in the PVA/PAMPS matrix.

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Section: Introductionmentioning

confidence: 99%

Green Route Fabrication of Graphene Oxide Reinforced Polymer Composites with Enhanced Mechanical Properties

Mahendran

Sridharan

Santhakumar

et al. 2016

Journal of Nanoscience

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“…Interesting observation is that up to 600 °C, GO shows a maximum weight loss of 84%, and while GO6 the weight loss were only around 9%. These findings may conclude that most of the oxygen functional groups have been removed from GO during plasma treatment …”

Section: Resultsmentioning

confidence: 72%

“…The D‐band arises due to the breathing mode of k‐point phonons of A 1 g symmetry and also provides the information about defects in carbon materials . The G‐band is due to the first order scattering of the E 2 g phonons of sp 2 carbon atoms and is a measure of graphitization . It was observed that the G‐band has broadened and shifted to 1586 cm −1 for GO6, possibly due to the restoring and re‐establishment of sp 2 carbon network.…”

Section: Resultsmentioning

confidence: 99%

Improved Solar Cell Performance of High Quality Plasma Reduced Graphene Oxide

Chandana

Ghosal

Subrahmanyam

2016

Plasma Process. Polym.

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A facile green approach for the preparation of reduced graphene oxide (RGO), based on a nonthermal plasma jet reactor, operating in an aqueous medium under ambient conditions was developed. Argon plasma treated GO samples were systematically characterized by X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier Transform Infrared (FT-IR) spectroscopy, Temperature programmed decomposition (TPD), Raman spectroscopy, and Transmission electron microscopy (TEM) techniques, which highlighted the potential of plasma approach for the formation of the RGO. The emission spectrum of the discharge confirms the in situ formation of hydrogen radicals (• H) and hydroxyl radicals (• OH), which reduce the oxygen functional groups of graphene oxide (GO), under mild reaction conditions. Raman spectroscopy confirms the optimum plasma treatment time of 6 h to deliver the best RGO (ID/IG $ 1.5), which also showed the highest solar cell efficiency of $2.3% when used as a counter electrode in a typical quantum dot sensitized solar cell.

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“…After reduction by Azotobacterchroococcum, the typical peak near 2θ=11° (d~ 0.81 nm) for GO vanished while a broad peak appeared in the range of 17-24° indicating parallel stacking of the RGO sheets (29) . Upon GO reduction by β-carotene the signal shifted to 23.13° with a d-spacing of 0.392 nm (30) .…”

Section: Discussionmentioning

confidence: 99%

Escherichia Coli as a Biological Model for Reduction of Graphene Oxide

2020

IJPHRD

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The present study was conducted to investigate the ability of bacteria to reduce Graphene Oxide (GO) sheets. Out of 82 bacterial isolates screened, one isolate was selected as a biological model for biosynthesis of reduced graphene oxide (RGO) nanosheets. This isolate was identified by morphological, biochemical tests, VITEK2 System, and 16S rRNA gene sequencing, aligned and submitted to the NCBI, and confirmed as Escherichia coli strain E-NO.7 (accession no. MK685205). The UV-vis. absorption peak was around 284 nm. The SEM images revealed thin, wrinkled, closely associated nanosheets. The weight percentage of carbon was 82.00% and oxygen was 18.00%. XRD analysis exhibited a broad diffraction peak at 2θ= 26.5° corresponding to the interlayer spacing of 0.34 nm. The FTIR spectrum showed decrease in peaks associated to oxygen functional groups, while other peaks vanished completely.

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Reduction of graphene oxide nanosheets by natural beta carotene and its potential use as supercapacitor electrode

Cited by 36 publications

References 38 publications

Green Route Fabrication of Graphene Oxide Reinforced Polymer Composites with Enhanced Mechanical Properties

Green Route Fabrication of Graphene Oxide Reinforced Polymer Composites with Enhanced Mechanical Properties

Improved Solar Cell Performance of High Quality Plasma Reduced Graphene Oxide

Escherichia Coli as a Biological Model for Reduction of Graphene Oxide

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