Synthesis of Graphene Oxide and Functionalized CNT Nanocomposites Based on Epoxy Resin

Moraes, Marina Borgert; Cividanes, Luciana De Simone; Thim, Gilmar Patrocínio

doi:10.5028/jatm.v10.944

Cited by 17 publications

(11 citation statements)

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“…Second, we recorded IR spectra of rGO samples after seven different reduction temperatures (Figure S7 in Supplementary Materials). The electrochemically produced educt GO powder showed significant IR bands at 3434 cm −1 (O-H stretching), 1723 cm −1 (C=O stretching), 1578 cm −1 (C=C stretching), 1385 cm −1 (C-O stretching of carboxylic group), 1214 cm −1 (C-O-C stretching) and 1124 cm −1 (C-OH stretching) [48,49].…”

Section: Thermal Reductionmentioning

confidence: 99%

Development and Up-Scaling of Electrochemical Production and Mild Thermal Reduction of Graphene Oxide

et al. 2022

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To reduce the global emissions of CO2, the aviation industry largely relies on new light weight materials, which require multifunctional coatings. Graphene and its derivatives are particularly promising for combining light weight applications with functional coatings. Although they have proven to have outstanding properties, graphene and its precursor graphene oxide (GO) remain far from application at the industrial scale since a comprehensive protocol for mass production is still lacking. In this work, we develop and systematically describe a sustainable up-scaling process for the production of GO based on a three-step electrochemical exfoliation method. Surface characterization techniques (XRD, XPS and Raman) allow the understanding of the fast exfoliation rates obtained, and of high conductivities that are up to four orders of magnitude higher compared to GO produced via the commonly used modified Hummers method. Furthermore, we show that a newly developed mild thermal reduction at 250 °C is sufficient to increase conductivity by another order of magnitude, while limiting energy requirements. The proposed GO powder protocol suggests an up-scaling linear relation between the amount of educt surface and volume of electrolyte. This may support the mass production of GO-based coatings for the aviation industry, and address challenges such as low weight, fire, de-icing and lightning strike protection.

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Section: Thermal Reductionmentioning

confidence: 99%

Development and Up-Scaling of Electrochemical Production and Mild Thermal Reduction of Graphene Oxide

et al. 2022

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“…The graphitic tangential mode or G band corresponds to an optical phonon mode, while the 2D band is a Raman-allowed signature by symmetry, not defect induced. 80 The D peak, which corresponds to the breathing modes of the A 1g symmetry around the K points of the Brillouin zone, is forbidden in an ideal graphitic structure and requires structural defects for a phonon of certain angular momentum to be activated. Consequently, the signature of the D band is a measure of the non-crystalline disorder, lattice distortions, and defects associated with the CNTs, whereas a higher intensity of the G band compared to D is a manifestation of superior graphitic crystallinity in the sample.…”

Section: Resultsmentioning

confidence: 99%

“…We see clear evidence of D, G, and 2D band signatures in our samples. Graphitic tangential mode or G band corresponds to an optical phonon mode, while, 2D is a Raman allowed signature by symmetry; not defect induced 84 . D peak which corresponds to breathing modes of A 1g symmetry around K points of the Brillouin zone is forbidden in an ideal graphitic structure and requires structural defects for a phonon of certain angular momentum to be activated.…”

Section: Characterizationmentioning

confidence: 99%

Low reflectance of carbon nanotube and nanoscroll-based thin film coatings: a case study

et al. 2021

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“…FTIR has also been used to demonstrate that a simple end-group modification with a silanol functional group to one end of a styrene-butadiene chain enhances the interaction with silica particles and improves their dispersion within the host matrix [53]. Infrared spectroscopy has also been used to follow chemical modification of the surface of carbon-based nanofillers such as carbon nanotubes or graphene materials during the functionalization process intended to get a better dispersion and a stronger interfacial adhesion to the matrix [54].…”

Section: Polymer Composite Characterizationmentioning

confidence: 99%

Some Applications of Vibrational Spectroscopy for the Analysis of Polymers and Polymer Composites

Bokobza

2019

Polymers

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Vibrational spectroscopies, including infrared and Raman techniques, are important tools for the characterization of chemical composition, molecular structures, and chain orientation under mechanical deformation of polymeric materials. The development of fiber-optic-based spectrometers has broadened the use of vibrational spectroscopy for process monitoring in various fields including polymerization, curing, and manufacturing processes. Combined with chemometrics, near-infrared (NIR) spectroscopy is now recognized as one of the most important techniques for polymer analyses. Infrared and Raman studies also offer invaluable means for the analysis of inorganic particles used as reinforcing fillers for polymers. The characterization of surface species and the nature of interfacial bonding between the organic and inorganic phases are important issues for the understanding of composite properties. Infrared spectroscopy is particularly convenient for the detection and analysis of hydroxyl groups on filler surfaces, and Raman spectroscopy is particularly well suited for the study of carbon-based materials. In both techniques, polymer-filler interactions can be evidenced through frequency shifts or width changes of bands associated with vibrational modes of functional groups of either macromolecular chains or filler particles. Selected examples of application of infrared and Raman spectroscopies illustrate their potential for monitoring polymer processes, measuring polymer orientation, and characterizing polymer composites.

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Synthesis of Graphene Oxide and Functionalized CNT Nanocomposites Based on Epoxy Resin

Cited by 17 publications

References 0 publications

Development and Up-Scaling of Electrochemical Production and Mild Thermal Reduction of Graphene Oxide

Development and Up-Scaling of Electrochemical Production and Mild Thermal Reduction of Graphene Oxide

Low reflectance of carbon nanotube and nanoscroll-based thin film coatings: a case study

Some Applications of Vibrational Spectroscopy for the Analysis of Polymers and Polymer Composites

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