Alkaline deoxygenated graphene oxide for supercapacitor applications: An effective green alternative for chemically reduced graphene

Perera, Sanjaya D.; Mariano, Ruperto G.; Nijem, Nour; Chabal, Yves J.; Ferraris, John P.; Balkus, Kenneth J.

doi:10.1016/j.jpowsour.2012.04.059

Cited by 129 publications

(73 citation statements)

References 62 publications

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“…26 About 50 mL of C. colocynthis leaf extract was mixed with 50 mL of GO (1 mg mL À1 ) and shaken thoroughly. The resulting mixture was maintained at a basic pH using NH 4 OH.…”

Section: Preparation Of Rgomentioning

confidence: 99%

Green synthesis of graphene nanosheets and their in vitro cytotoxicity against human prostate cancer (DU 145) cell lines

Zhu

Liu

et al. 2017

Nanomaterials and Nanotechnology

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A simple and green approach for the synthesis of polyphenol-functionalized reduced graphene oxide nanosheets is demonstrated, using leaf extract of Citrullus colocynthis as a deoxygenating agent. The C. colocynthis polyphenols also play a significant role as a stabilizing agent, preventing agglomeration of reduced graphene oxide nanosheets. Cytotoxicity tests showed that the both graphene oxide and Citrullus colocynthis polyphenol-stabilized reduced graphene oxide were toxic to DU145 cells; the cytotoxicity was dose dependent. Hence, C. colocynthis-mediated reduced graphene oxide may be an ideal anticancer material for biological study applications.

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“…26 About 50 mL of C. colocynthis leaf extract was mixed with 50 mL of GO (1 mg mL À1 ) and shaken thoroughly. The resulting mixture was maintained at a basic pH using NH 4 OH.…”

Section: Preparation Of Rgomentioning

confidence: 99%

Green synthesis of graphene nanosheets and their in vitro cytotoxicity against human prostate cancer (DU 145) cell lines

Zhu

Liu

et al. 2017

Nanomaterials and Nanotechnology

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“…The intensity of the D band at 1,352 cm -1 was also increased which could be attributed to the decrease in size of in-plane sp 2 domains compared to graphite. 12,17,22,52 For RGO, the G band is broadened, shifted to 1,611 cm -1 , and moved closer to the G band of graphite, which is attributed to graphitic self-healing and successful reduction, 63 as the removal of oxygen groups allows the RGO to associate and restack. The D band of RGO becomes more prominent and remains almost at the same position as GO, ie, at 1,351 cm -1 .…”

mentioning

confidence: 94%

“…Moreover, hydrazine-reduced graphene tends to agglomerate irreversibly and converts into graphite. 17 Metal/hydrochloric acid reduction is another alternative; however, impurities formed from the residual metal hinders further applications. 18,19 Recently, reduction of GO using environmentally friendly organic agents such as vitamin C, 20 amino acid, 21 glucose, 22 protein, 23 green tea, 24,25 dextran, 26 bacterial respiration, 27 and Escherichia coli 12 have taken a center stage and have been proposed as alternatives.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of a broad peak indicates the loss of long range order in the graphene sheets, the graphene sheets are stacked with few-layers. 17,47,54,55 In addition, the significant reduction in the interlayer spacing of RGO as compared to GO suggests the removal of oxygen groups and water molecules from the interlayer of graphene sheets in RGO. However, a difference in the interlayer distance of approximately 0.04 nm between the pristine graphite and RGO is observed.…”

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confidence: 99%

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Exceedingly biocompatible and thin-layered reduced graphene oxide nanosheets using an eco-friendly mushroom extract strategy

Muthoosamy

Bai

Abubakar

et al. 2015

IJN

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Purpose A simple, one-pot strategy was used to synthesize reduced graphene oxide (RGO) nanosheets by utilizing an easily available over-the-counter medicinal and edible mushroom, Ganoderma lucidum . Methods The mushroom was boiled in hot water to liberate the polysaccharides, the extract of which was then used directly for the reduction of graphene oxide. The abundance of polysaccharides present in the mushroom serves as a good reducing agent. The proposed strategy evades the use of harmful and expensive chemicals and avoids the typical tedious reaction methods. Results More importantly, the mushroom extract can be easily separated from the product without generating any residual byproducts and can be reused at least three times with good conversion efficiency (75%). It was readily dispersible in water without the need of ultrasonication or any surfactants; whereas 5 minutes of ultrasonication with various solvents produced RGO which was stable for the tested period of 1 year. Based on electrochemical measurements, the followed method did not jeopardize RGO’s electrical conductivity. Moreover, the obtained RGO was highly biocompatible to not only colon (HT-29) and brain (U87MG) cancer cells, but was also viable towards normal cells (MRC-5). Conclusion Besides being eco-friendly, this mushroom based approach is easily scalable and demonstrates remarkable RGO stability and biocompatibility, even without any form of functionalization.

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“…These peaks centered at 2θ = 24° for all three samples. The appearance of this broad peak at 24° indicates the restoration of van der Waals interaction between the carbon frameworks on the graphene sheets through reduction [16][17][18][19]. In addition, the appearance of these peaks in all samples after the addition of MgO announces the presence of the amorphous phase of MgO, with almost no crystalline structure.…”

Section: Structural Propertiesmentioning

confidence: 85%

Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites

Kimiagar

Abrinaei

2017

Nanophotonics

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Magnesium oxide (MgO)-graphene oxide (GO) nanocomposites were prepared by the hydrothermal method at different temperatures. The effect of growth temperature on the structural, linear, and nonlinear optical (NLO) parameters was investigated. The decoration of MgO on GO sheets was confirmed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and UV-visible (UV-vis) spectroscopy analyses. The energy band-gaps of MgO-GO nanocomposites were calculated from UV-vis spectrum using Tauc plot. The NLO parameters of MgO-GO nanocomposites were calculated for the first time by the simple Z-scan technique with nanosecond Nd:YAG laser at 532 nm. The nonlinear absorption coefficient β and nonlinear refractive index n 2 for MgO-GO nanocomposites at the laser intensity of 1.1 × 10 8 W/cm 2 were measured to be in the order of 10 −7 cm/W and 10 −12 cm 2 /W, respectively. The third-order NLO susceptibility of MgO-GO nanocomposites was measured in the order of 10 −9 esu. The results showed that MgO-GO structures have negative nonlinearity as well as good nonlinear two-photon absorption at 532 nm. Furthermore, the NLO parameters increased by the enhancement of the growth temperature. As the investigation of new materials plays an important role in the advancement of optoelectronics, MgO-GO nanocomposites possess potential applications in NLO devices.

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Alkaline deoxygenated graphene oxide for supercapacitor applications: An effective green alternative for chemically reduced graphene

Cited by 129 publications

References 62 publications

Green synthesis of graphene nanosheets and their in vitro cytotoxicity against human prostate cancer (DU 145) cell lines

Green synthesis of graphene nanosheets and their in vitro cytotoxicity against human prostate cancer (DU 145) cell lines

Exceedingly biocompatible and thin-layered reduced graphene oxide nanosheets using an eco-friendly mushroom extract strategy

Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites

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