Synthesis, characterization, structural, optical properties and catalytic activity of reduced graphene oxide/copper nanocomposites

Nasrollahzadeh, Mahmoud; Babaei, Ferydon; Fakhri, Parisa; Jaleh, Babak

doi:10.1039/c4ra12552e

Cited by 75 publications

(43 citation statements)

References 60 publications

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“…The interlayer spacing was determined from the (002) peak by applying Bragg's law with a wavelength of Cu Kα as 1.541˚ Å. After the thermal treatment of GO at 350˚C, the fact that the sharp diffraction peak at 2θ = 11.95˚ disappeared indicate the efficient exfoliation of the multiple layers during the thermal reduction of GO [22] [23] [24]. The SEM micrographs of GO synthesized by a modified Hummers processing Figures 6(a)-(h) clearly shows that the GO has a two-dimensional sheet-like structure.…”

Section: Results and Discussion Identify The Headingsmentioning

confidence: 99%

Synthesis of Graphene Oxide (GO) by Modified Hummers Method and Its Thermal Reduction to Obtain Reduced Graphene Oxide (rGO)*

Alam¹,

Sharma²,

Kumar³

2017

Graphene

981

334

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Over the span of years, improvements over various synthesis methods of graphene are constantly pursued to provide safer and more effective alternatives. Though the extraction of graphene through Hummers method is one of the oldest techniques yet it is one of the most suitable methods for the formation of bulk graphene. Graphene can be obtained in the form of reduced Graphite oxide, sometimes also referred as Graphene oxide. The effectiveness of this oxidation process can be evaluated by the magnitude of carbon/oxygen ratio of the obtained graphene. Here, graphene oxide (GO) was prepared by oxidizing the purified natural flake graphite (NFG) by a modified Hummers method. The attempts have been made to synthesize GO having few layers by using a modified Hummers method where the amount of NaNO 3 has been decreased, and the amount of KMnO 4 is increased. The reaction has been performed in a 9:1 (by volume) mixture of H 2 SO 4 /H 3 PO 4 . This modification is successful in increasing the reaction yield and reducing the toxic gas evolution while using a varied proportion of KMnO 4 and H 2 SO 4 as those required by Hummers method. A new component of K 2 S 2 O 8 has been introduced to the reaction system to maintain the pH value. Reduced graphene oxide (rGO) was thereafter extracted by thermal modification of GO. Here, GO has been used as a precursor for graphene synthesis by thermal reduction processes. The results of FTIR and Raman spectroscopy analysis show that the NFG when oxidized by strong oxidants like KMnO 4 and NaNO 3 , introduced oxygen atoms into the graphite layers and formed bonds like C=O, C-H, COOH and C-O-C with the carbon atoms in the graphite layers. The structure and morphology of both GO and rGO were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy, Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis and differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).

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Section: Results and Discussion Identify The Headingsmentioning

confidence: 99%

Synthesis of Graphene Oxide (GO) by Modified Hummers Method and Its Thermal Reduction to Obtain Reduced Graphene Oxide (rGO)*

Alam¹,

Sharma²,

Kumar³

2017

Graphene

981

334

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“…Nasrollahzadeh et al. fabricated copper/reduced graphene oxide nanocomposites for enhancing the catalytic activity . Highly efficient catalyst (Pt/r‐GO nanocomposites) has been prepared for oxidation of methanol …”

Section: Introductionmentioning

confidence: 99%

“…[14] Nasrollahzadeh et al fabricated copper/ reduced graphene oxide nanocomposites for enhancing the catalytic activity. [15] Highly efficient catalyst (Pt/r-GO nanocomposites) has been prepared for oxidation of methanol. [16] Recently, preparation of graphene based Ag NPs has received significant research interest due to its various applications in the field of transistors, catalysis, polymer reinforcement, bioengineering, biomaterials and sensing.…”

Section: Introductionmentioning

confidence: 99%

Dual Activities of Nano Silver Embedded Reduced Graphene Oxide Using Clove Leaf Extracts: Hg²⁺ Sensing and Catalytic Degradation

et al. 2019

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Silver nanoparticles embedded reduced graphene oxide (rGO−Ag) nanocomposites are synthesized by green technique using clove leaf aqueous extract as reducing agent. The surface plasmon resonance (SPR) peak of silver nanoparticles (Ag NPs) at 410 nm in rGO−Ag nanocomposites is analysed by UV–visible spectroscopy. The intensity of surface plasmon resonance (SPR) peak of Ag NPs in rGO−Ag nanocomposites is decreased with addition of Hg2+ ion at small interval of time. This is due to the occurrence of redox reaction between Ag(0) and Hg2+ and also for the formation Ag/Hg amalgam. The lower limit of detection (LOD) of rGO−Ag nanocomposites for Hg2+ ion is found to be 9.5 nM. Moreover, the rGO−Ag nanocomposites may be used as catalyst for degradation of methylene blue (MB) by sodium borohydride (NaBH4) at ambient temperature. The adsorption efficiency of methylene blue is increased due to hydrogen bonding and electrostatic interaction along with π–π stacking between the catalyst and the dye molecules. The methylene blue is degraded within a small time due to large surface area and more number of active sites of rGO−Ag nanocomposites. The as‐synthesized nanocomposite is a potential hybrid material having dual activity as Hg2+ sensing and catalytic behaviour in degradation of methylene blue.

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“…Presence of the hydrophilic functional groups attracts water molecules and increases the capacitance. GOs have lots of hydroxyl groups as well as carboxyl groups in their structure [44]. The incorporation of GO in CNC matrix increases number of hydrophilic functional groups like hydroxyl groups and carboxyl groups in the composite.…”

Section: Working Mechanism Of the Sensormentioning

confidence: 99%

Cellulose nanocrystal/graphene oxide composite film as humidity sensor

Kafy

Akther

Shishir

et al. 2016

Sensors and Actuators A: Physical

120

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Synthesis, characterization, structural, optical properties and catalytic activity of reduced graphene oxide/copper nanocomposites

Abstract: This paper reports on the synthesis and use of copper nanoparticles supported on reduced graphene oxide, as separable catalysts for N-arylation of phenylurea with aryl halides under ligand-free and microwave conditions. Also, the structural and optical properties are studied.

Cited by 75 publications

References 60 publications

Synthesis of Graphene Oxide (GO) by Modified Hummers Method and Its Thermal Reduction to Obtain Reduced Graphene Oxide (rGO)*

Synthesis of Graphene Oxide (GO) by Modified Hummers Method and Its Thermal Reduction to Obtain Reduced Graphene Oxide (rGO)*

Dual Activities of Nano Silver Embedded Reduced Graphene Oxide Using Clove Leaf Extracts: Hg²⁺ Sensing and Catalytic Degradation

Cellulose nanocrystal/graphene oxide composite film as humidity sensor

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Synthesis, characterization, structural, optical properties and catalytic activity of reduced graphene oxide/copper nanocomposites

Abstract: This paper reports on the synthesis and use of copper nanoparticles supported on reduced graphene oxide, as separable catalysts for N-arylation of phenylurea with aryl halides under ligand-free and microwave conditions. Also, the structural and optical properties are studied.

Cited by 75 publications

References 60 publications

Synthesis of Graphene Oxide (GO) by Modified Hummers Method and Its Thermal Reduction to Obtain Reduced Graphene Oxide (rGO)*

Synthesis of Graphene Oxide (GO) by Modified Hummers Method and Its Thermal Reduction to Obtain Reduced Graphene Oxide (rGO)*

Dual Activities of Nano Silver Embedded Reduced Graphene Oxide Using Clove Leaf Extracts: Hg2+ Sensing and Catalytic Degradation

Cellulose nanocrystal/graphene oxide composite film as humidity sensor

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Product

Resources

About

Dual Activities of Nano Silver Embedded Reduced Graphene Oxide Using Clove Leaf Extracts: Hg²⁺ Sensing and Catalytic Degradation