Reduced graphene oxide synthesized by a new modified Hummer's method for enhancing thermal and crystallinity properties of Poly(vinylidene fluoride)

Tienne, Lucas Galhardo Pimenta; Candido, Ludmila da Silva; Cruz, Bárbara de Salles Macena da; Gondim, Fernanda Fabbri; Ribeiro, Matheus Pereira; Simão, Renata Antoun; Marques, Maria de Fátima Vieira; Monteiro, Sérgio Neves

doi:10.1016/j.jmrt.2022.04.092

Cited by 30 publications

(8 citation statements)

References 127 publications

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“…Epitaxial graphene growth on silicon carbide by thermal decomposition can produce large-scale and high-quality graphene, − whereas this procedure is only suitable for the synthesis of a graphene film on semiconductors because the graphene film can directly be grown on silicon carbide. Chemical vapor deposition (CVD) is a popular method of synthesizing large-scale and large-area graphene films with low-cost production. − For the synthesis of graphene powder, the oxidation–reduction method is widely utilized to fabricate reduced graphene oxide with large-scale and low-cost production. − However, the electrical properties of the reduced graphene oxide are poor due to the appearance of a large number of defects and the oxygen content on its surface. For the synthesis of a turbostratic graphene film, Wei et al modified the CVD method for the growth of a turbostratic graphene film by growing another graphene on top of single-layer graphene .…”

Section: Introductionmentioning

confidence: 99%

Growth of High-Purity and High-Quality Turbostratic Graphene with Different Interlayer Spacings

2023

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Turbostratic graphene is a multilayer graphene, which has exotic electrical properties similar to those of monolayer graphene due to the low interlayer interaction. Additionally, the stacking structure of the turbostratic multilayer graphene can decrease the effect of attachment of charge impurities and surface roughness. This paper explores the growth of high-purity and high-quality turbostratic graphene with different interlayer spacings by calcining ferric chloride and sucrose at 1000 °C for 1 h under an argon atmosphere. X-ray diffraction patterns and Raman results imply that the turbostratic graphene contains two different interlayer spacings: 3.435 and 3.55 Å. The 3.55 Å turbostratic graphene is on top of the 3.435 Å turbostratic graphene, and there is an AB stacking pattern between the topmost graphene layer of 3.435 Å turbostratic graphene and the first graphene layer of the 3.55 Å turbostratic graphene, with an interlayer spacing of 3.35 Å. The two different interlayer spacings of turbostratic graphene arise from different cooling rates between the higher temperature ranges (>700 °C) and lower temperatures (<700 °C).

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Section: Introductionmentioning

confidence: 99%

Growth of High-Purity and High-Quality Turbostratic Graphene with Different Interlayer Spacings

2023

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“…On the other hand, the SEM image of rGO exhibited a more compact layered structure than GO, as shown in Figure e, due to the removal of oxygenated functional groups and the π–π interaction of sp 2 structures. Efficient reduction of oxygen-containing moieties and defects on the basal plane of GO resulted in rGO with folded layers and a high degree of aggregation. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…Efficient reduction of oxygencontaining moieties and defects on the basal plane of GO resulted in rGO with folded layers and a high degree of aggregation. 34,35 To study the surface wettability of the GO and rGO, the contact angle (CA) of water droplets was measured. 36,37 For example, the CA of GO synthesized via Hummer's method was found to be ∼39.9°, as shown in Figure 5f, which may be attributed to the oxygen-containing functional groups (e.g., hydroxyl, carboxyl, carbonyl, and epoxy groups) on the basal plane of GO, implying that the surface of GO is hydrophilic.…”

Section: Surface Morphology and Surfacementioning

confidence: 99%

Synergistic Effect of Electrocatalytic Characteristics of a Redox Segment and Gas Barrier of rGO to Significantly Replace the Loading of Zinc Dust in Solvent-Based Epoxy Composites Applied for Heavy-Duty Anticorrosion Coatings

Lan

Yan

et al. 2023

ACS Appl. Eng. Mater.

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Zinc-rich epoxy coating plays a major role in current heavy-duty corrosion protection solutions, yet high loading of zinc dust (ZD) weakens the coating flexibility and adhesion capability of the overall coating. This work demonstrated the successful incorporation of small amounts of rGO and aniline pentamer (AP)-based diamine into zinc-rich non-electroactive epoxy thermoset (NEET) as a novel heavy-duty anticorrosion coating composite. This coating composite promoted its wear resistance without sacrificing anticorrosion performance and adhesion ability while effectively reducing the loading of ZD. Based on a series of electrochemical measurements, an electroactive epoxy thermoset (EET) containing 5 wt % electroactive APbased diamine (DAAP) and 0.5 wt % rGO can replace 70 wt % ZD and shows equivalent anticorrosion performance under an accelerated salt-spray assay and electrochemical corrosion measurements. Furthermore, coatings containing DAAP and rGO exhibited improved wear resistance and good adhesion capability.

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“…Exfoliated GO manifests a lower angle of diffraction than pristine graphite, i.e., 10.5° and 26°, respectively. The peak at 2θ = 10.5° is caused by the deposition of water molecules between the sheets of the graphite and the creation of functional groups containing oxygen, which caused the increase in d-spacing [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

The Cytotoxic Effectiveness of Thiourea-Reduced Graphene Oxide on Human Lung Cancer Cells and Fungi

Vimalanathan

Vijaya²,

Mary³

et al. 2022

Nanomaterials

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This study demonstrated the effective reduction of graphene oxide (GO) by employing thiourea as a reducing and stabilizing agent. Two fungi (Aspergillus flavus and Aspergillus fumigatus) were used for anti-fungal assay. Cell viability, cell cycle analysis, DNA fragmentation, and cell morphology were assessed to determine the toxicity of thiourea-reduced graphene oxide (T-rGO) on human lung cancer cells. The results revealed that GO and T-rGO were hazardous to cells in a dose-dependent trend. The viability of both A. fumigatus and A. flavus was affected by GO and T-rGO. The reactive oxygen species produced by T-rGO caused the death of A. flavus and A. fumigatus cells. This study highlighted the effectiveness of T-rGO as an antifungal agent. In addition, T-rGO was found to be more harmful to cancer cells than GO. Thus, T-rGO manifested great potential in biological and biomedical applications.

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Reduced graphene oxide synthesized by a new modified Hummer's method for enhancing thermal and crystallinity properties of Poly(vinylidene fluoride)

Cited by 30 publications

References 127 publications

Growth of High-Purity and High-Quality Turbostratic Graphene with Different Interlayer Spacings

Growth of High-Purity and High-Quality Turbostratic Graphene with Different Interlayer Spacings

Synergistic Effect of Electrocatalytic Characteristics of a Redox Segment and Gas Barrier of rGO to Significantly Replace the Loading of Zinc Dust in Solvent-Based Epoxy Composites Applied for Heavy-Duty Anticorrosion Coatings

The Cytotoxic Effectiveness of Thiourea-Reduced Graphene Oxide on Human Lung Cancer Cells and Fungi

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