Preparation and Characterization of Reduced Graphene Oxide Sheets via Water-Based Exfoliation and Reduction Methods

Loryuenyong, Vorrada; Totepvimarn, Krit; Eimburanapravat, Passakorn; Boonchompoo, Wanchai; Buasri, Achanai

doi:10.1155/2013/923403

Cited by 317 publications

(200 citation statements)

References 20 publications

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“…4. In this research, a broad peak is observed from 10 to 40°with the highest intensity at 23.65°which may be attributed to partial restacking of exfoliated graphene layers [19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Reduced Graphene Oxide nano-composites layer on fiber optic tip sensor reflectance response for sensing of aqueous ethanol

Rosli

Arasu

Noor

et al. 2016

J. Eur. Opt. Soc.-Rapid Publ.

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In this study, the used of tapered optical fiber tip as sensors coated with reduced Graphene Oxide (rGO) is investigated. The resultant rGO nanocomposites coated on the tapered fiber sensor were characterized by X-ray Diffraction (XRD), Raman spectroscopy, and field emission scanning electron microscopy (FESEM). Optimization of the rGO layer and the tapering parameters are found and the sensing capability of the device is tested using different concentrations of ethanol in water. The nanocomposite layer improved the performance of the sensor by demonstrating high sensitivity to aqueous ethanol when interrogated in the visible region using a spectrometer in the optical wavelength range of 500-700 nm. The reflectance response of the rGO coated fiber tip reduced linearly, upon exposure to ethanol concentrations ranging between 20-80 %.

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“…4. In this research, a broad peak is observed from 10 to 40°with the highest intensity at 23.65°which may be attributed to partial restacking of exfoliated graphene layers [19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Reduced Graphene Oxide nano-composites layer on fiber optic tip sensor reflectance response for sensing of aqueous ethanol

Rosli

Arasu

Noor

et al. 2016

J. Eur. Opt. Soc.-Rapid Publ.

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“…However, the presence of Gr increased the crystalline domain size of the hydroxyapatite grains, since the reported value for pure hydroxyapatite electrochemically synthesized at the same pH and current density was 21.6 nm [29], indicating that there were interactions between the hydroxyapatite and graphene sheets. http://carbonlett.org broad peak at around 300°C in the DTG curve, corresponds to the combustion of the organic material, EDTA [44] and the unstable carbon in the graphene structure [45], as well as the beginning of hydroxyapatite dehydroxylation [14,15]. The third stage, observed between 420°C and 600°C, with 1.22 wt.…”

Section: Morphological Characterizationmentioning

confidence: 99%

Electrochemical synthesis of nanosized hydroxyapatite/graphene composite powder

Mišković‐Stanković¹,

Eraković²,

Jankovic³

et al. 2015

Carbon letters

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Electrochemical synthesis was employed to prepare a novel hydroxyapatite/graphene (HAP/ Gr) composite powder suitable for medical applications as a hard tissue implant (scaffold). The synthesis was performed in a homogeneous dispersion containing Na 2 H 2 EDTA·2H 2 O, NaH 2 PO 4 and CaCl 2 with a Ca/EDTA/PO 4 3− concentration ratio of 0.25/0.25/0.15M, along with 0.01 wt% added graphene nanosheets, at a current density of 137 mA cm −2 and pH value of 9.0. The field emission scanning electron microscopy and transmission electron microscopy observations of the composite HAP/Gr powder indicated that nanosized hydroxyapatite particles were uniformly placed in the graphene overlay. Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction confirmed graphene incorporation in the HAP/Gr powder. The electrochemically prepared HAP/Gr composite powder exhibited slight antibacterial effect against the growth of the bacterial strain Staphylococcus aureus.

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“…After the reduction of GO, hydroxyl, and carbonyl groups were significantly decreased and the sp 2 hybridized in-plane C=C ring stretching at 1538 cm −1 was present. However, in order to effectively eliminate oxygen functional groups on carbon planes, strongly acidic environment might be required [45]. Attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR) measurement was employed to characterize the structure and functional groups of the materials.…”

Section: Characterization Of Coatingmentioning

confidence: 99%

“…After the reduction of GO, hydroxyl, and carbonyl groups were significantly decreased and the sp 2 hybridized in-plane C=C ring stretching at 1538 cm −1 was present. However, in order to effectively eliminate oxygen functional groups on carbon planes, strongly acidic environment might be required [45]. The XRD patterns of graphite, GO, GO on Cu, and GO coated on Cu and reduced by NaBH 4 are shown in Figure 7.…”

Section: Characterization Of Coatingmentioning

confidence: 99%

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

et al. 2017

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Abstract:In this paper, we report the use of a simple and inexpensive electrophoretic deposition (EPD) technique to develop thin, uniform, and transparent graphene oxide (GO) coating on copper (Cu) substrate on application of 10 V for 1 s from an aqueous suspension containing 0.03 wt % graphene oxide. GO was partially reduced during the EPD process itself. The GO coated on Cu was completely reduced chemically by using sodium borohydride (NaBH 4 ) solution. The coatings were characterized by field emission scanning electron microscope (FESEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), XRD, and UV/VIS spectrophotometry. Corrosion resistance of the coatings was evaluated by electrochemical measurements under accelerated corrosion condition in 3.5 wt % NaCl solution. The GO coated on Cu and chemically reduced by NaBH 4 showed more positive corrosion potential (E corr ) (−145.4 mV) compared to GO coated on Cu (−182.2 mV) and bare Cu (−235.3 mV), and much lower corrosion current (I corr ) (7.01 µA/cm 2 ) when compared to 15.375 µA/cm 2 for bare Cu indicating that reduced GO film on copper exhibit enhanced corrosion resistance. The corrosion inhibition efficiency of chemically reduced GO coated Cu was 54.40%, and its corrosion rate was 0.08 mm/year as compared to 0.18 mm/year for bare copper.

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Preparation and Characterization of Reduced Graphene Oxide Sheets via Water-Based Exfoliation and Reduction Methods

Cited by 317 publications

References 20 publications

Reduced Graphene Oxide nano-composites layer on fiber optic tip sensor reflectance response for sensing of aqueous ethanol

Reduced Graphene Oxide nano-composites layer on fiber optic tip sensor reflectance response for sensing of aqueous ethanol

Electrochemical synthesis of nanosized hydroxyapatite/graphene composite powder

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

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