Temperature dependence green reduction of graphene oxide by urea

Chamoli, Pankaj; Das, Malay Kumar; Kar, Kamal K.

doi:10.5185/amlett.2017.6559

Cited by 19 publications

(6 citation statements)

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“…10a ) showed two stage weight loss at 110 °C (12.82%) and 452 °C (33.15%) due to the removal of absorbed water molecules from the GO material and decomposition of oxygen-containing functional groups respectively. 55 In the TG curve of PVP–CeO 2 /rGO ( Fig. 10b ), the corresponding weight loss occurred at a relatively higher temperature of 635 °C (28.43%) indicating higher thermal stability of the material as compared to GO.…”

Section: Resultsmentioning

confidence: 97%

Synthesis and catalytic evaluation of PVP–CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Siddiqui

2020

Nanoscale Adv.

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Section: Resultsmentioning

confidence: 97%

Synthesis and catalytic evaluation of PVP–CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Siddiqui

2020

Nanoscale Adv.

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“…The peaks located at 2,928 and 2,855 cm −1 are assigned to C-H, while the peak located at 1,600 cm −1 is assigned to C=C bonds associated with the GNs carbon skeleton structure 29,30 . Moreover, the peaks located at 1,453, 1,379, 890 and 701 cm −1 are attributed to C-O (epoxy and alkoxy) bonds 31 . There is a noticeable increase in the intensity of the 1,600 cm −1 peak of C=C bonds for nanofluids with GNs as compared to EG base fluid which further confirms a successful synthesis of graphene.…”

Section: Resultsmentioning

confidence: 99%

Thermal conductivity enhancement in gold decorated graphene nanosheets in ethylene glycol based nanofluid

Mbambo

Khamliche

Khumalo

et al. 2020

Sci Rep

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We report on the synthesis and thermal conductivity of gold nanoparticles (AuNPs) decorated graphene nanosheets (GNs) based nanofluids. The GNs-AuNPs nanocomposites were synthesised using a nanosecond pulsed Nd:YAG laser (wavelength = 1,064 nm) to ablate graphite target followed by Au in ethylene glycol (EG) base fluid to obtain GNs-AuNPs/EG hybrid nanofluid. The characterization of the as-synthesised GNs-AuNPs/EG hybrid nanofluid confirmed a sheet-like structure of GNs decorated with crystalline AuNPs with an average particle diameter of 6.3 nm. Moreover, the AuNPs appear smaller in the presence of GNs which shows the advantage of ablating AuNPs in GNs/EG. The thermal conductivity analysis in the temperature range 25–45 °C showed that GNs-AuNPs/EG hybrid nanofluid exhibits an enhanced thermal conductivity of 0.41 W/mK compared to GNs/EG (0.35 W/mK) and AuNPs/EG (0.39 W/mK) nanofluids, and EG base fluid (0.33 W/mK). GNs-AuNPs/EG hybrid nanofluid displays superior enhancement in thermal conductivity of up to 26% and this is due to the synergistic effect between AuNPs and graphene sheets which have inherent high thermal conductivities. GNs-AgNPs/EG hybrid nanofluid has the potential to impact on enhanced heat transfer technological applications. Also, this work presents a green synthesis method to produce graphene-metal nanocomposites for various applications.

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“…Furthermore, the CdS-N spectrum presented small displacements, in about 0.1°(2θ), towards lower angles, suggesting an expansion of the cell volume. Figure 2(c) shows the GO diffraction pattern, which is different from graphite [19]. The GO presents two characteristic peaks, after being oxidized, which are located at 2θ=12.83°a nd 42.77°matching well with the (0 0 2), and the (1 0 0) planes.…”

Section: Xrdmentioning

confidence: 94%

“…Graphene has become a material of great interest due to its outstanding physical and chemical properties provided by its bi-dimensional hexagonal structure. Besides, it shows excellent intrinsic resistance, optical transparency, high carrier mobility, and high thermal conductivity [19]. Comparing the graphene precursors, GO provide an sp 2 -hybridized carbon atoms network and, in a minor proportion, sp 3 -hybridized carbon.…”

Section: Introductionmentioning

confidence: 99%

Novel nitrogen plasma doping on CdS/GO compounds and their photocatalytic assessment

et al. 2021

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Nitrogen-doping of cadmium sulfide nanostructured compounds was carried out under a nitrogen plasma source to produce CdS-N compounds. Once prepared, it was supported on graphene oxide sheets for producing CdS-N/GO photocatalysts, which were tested in the degradation of lignin and methylene blue (MB) molecules. Photocatalytic reactions were carried out under UV and visible (vis) energy irradiation. To provide insight on the catalytic behavior the CdS, CdS-N, GO, and CdS-N/GO compounds were characterized using different techniques including x-ray diffraction, scanning electron microscopy, Raman, and UV–vis diffuse reflectance spectroscopy. X-ray photoelectron spectroscopy allowed determining the chemical composition in samples. It was observed an outstanding performance in photocatalytic activity tests, attributed to the extended response towards the visible light regime, and the synergistic effect between CdS-N and GO particles. The catalytic activity tests, reveal that the CdS-N/GO compound achieved over 90% lignin degradation and 100% of MB degradation. In addition, a remarkable performance is observed in the CdS-N/GO compound which exhibited stability after performing several reaction cycles.

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Temperature dependence green reduction of graphene oxide by urea

Cited by 19 publications

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Synthesis and catalytic evaluation of PVP–CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Synthesis and catalytic evaluation of PVP–CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Thermal conductivity enhancement in gold decorated graphene nanosheets in ethylene glycol based nanofluid

Novel nitrogen plasma doping on CdS/GO compounds and their photocatalytic assessment

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Temperature dependence green reduction of graphene oxide by urea

Cited by 19 publications

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Synthesis and catalytic evaluation of PVP–CeO2/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Synthesis and catalytic evaluation of PVP–CeO2/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Thermal conductivity enhancement in gold decorated graphene nanosheets in ethylene glycol based nanofluid

Novel nitrogen plasma doping on CdS/GO compounds and their photocatalytic assessment

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Synthesis and catalytic evaluation of PVP–CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water

Synthesis and catalytic evaluation of PVP–CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water