Synthesis, characterization and tribological properties of Cu/reduced graphene oxide composites

Jia, Zhengfeng; Chen, Tiedan; Wang, Jie; Ni, Junjie; Li, Huaiyong; Shao, Xin

doi:10.1016/j.triboint.2015.02.028

Cited by 101 publications

(38 citation statements)

References 38 publications

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“…The most prominent features, D( 1350 cm À1 ) and G( 1580 cm À1 )b ands, are assigned to disorder-induced breathing modes of sp 2 -hybridized atoms in carbon rings and to stretchingm odes from the sp 2 -hybridized carbon pairs, respectively. [5,7,13] In our experiment, this ratio increases from 0.81 for GO to 1.13 for SiW 12 @rGO,which confirms the effectiveness of the reduction process using reduced SiW 12 .I tc an be interpreted by the creation, during the GO reduction,o fn umerous new graphitic domains (sp 2 )s maller in size than those presenti nt he exfoliated GO. The SiW 12 @rGO spectrum is, however,c onsiderably altered with ad ominant intensity of the Db and over the G band.…”

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confidence: 98%

Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

et al. 2016

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An ecofriendly chemical reduction of graphene oxide (GO) in water is reported. The reducing agent is an electrochemically reduced Keggin-type polyoxometalate (SiW 12 O 40 5À ). Moreover, this process leads to the fabrication of SiW 12 @rGO nanocomposite. This nanohybrid exhibits an electrochemical response which combines highf aradic and capacitive currents due to high coverage of polyoxometalates on the rGO sheets. Therefore this material has strong potentiality for energy storage.Graphene is the first two-dimensional atomic crystal available. Its singular structure is reflected by exceptionalp roperties like high mechanical strength and extremely high electrical and thermalc onductivities. The potentiala pplicationso fg raphene are multiple, ranging from electronics or flexible screens or catalysts to use in thermalm anagement. However,t he difficulties associated with its production are ac ritical drawback for largescale use. Several methods have been developedb ased on chemicala nd physical exfoliation of graphite:e lectrochemical exfoliation, [1] intercalation of elementi ng raphite compounds at elevated temperatures, [2] and liquid-phasee xfoliation using agents like N-methylpyrrolidone, iodine, chloride, or bromide. [3] Nevertheless, the most common methodf or large-scale productiono fg raphene is the moderate oxidation of graphite through the modified Hummers method, [4] followed by exfoliation of the resulting graphene oxide (GO) and its reduction to obtain graphene (reduced graphene oxide,r GO). [4][5][6] The last step involves common products like hydrazine hydrate or formaldehyde which are known to be hazardous to human health and the environment. To avoid these components, an alternative method based on the UV-assisted photoreduction of GO in the presence of polyoxometalates(POMs) and asacrificial organic reagent has been proposed. [7] POMs are ac lass of inorganic metal-oxygen cluster anions with redox properties. [8] These clusters (so-called isopoly-and heteropolyanions( HPAs)) contain highly symmetrical core assemblies of MO x units (M = V, Mo, W). They can have various structures containing for example 6, 12, or 18 metal atoms in ah igh oxidation state. For HPAs, the structure with 12 metal atoms is the Keggins tructure. In the method just mentioned the POMs act also as anionic stabilizers, preventing the aggregation of rGO and leadingt ot he formation of POM@rGO nanocomposites.H owever,o nly small amounts of rGO could be obtained under such conditions due to localized laser irradiation, and also an organic reagent has to be used. It hasa lso been shownt hat the hydrothermal reduction of GO in the presence of H 3 PMo 12 O 40 (PMo 12 )l eads to the nanocomposite PMo 12 @rGO. [9] Another route developed recently concerns the electrochemical reduction of GO assisted by POMs. [10] Herein we propose an environmentally friendly,t wo-step process for the preparation of reduced graphene oxide decorated with POMs (POM@rGO). In this process the first step is the electroreduction of SiW 12 O 40 4À (SiW 12 ...

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Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

et al. 2016

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“…The HRTEM image [ Fig. 4(c) 154 and 3437 cm À1 can be attributed to bending vibrations and 155 stretching of hydroxyl groups, respectively [26]. The peak at 156 around 1150 cm À1 can be attributed to the C-O stretching 157 vibration [27].…”

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“…Among them, the fabrication of ZnTe 22 based composites, such as ZnTe/TiO 2 nanotube arrays, was 23 considered an effective remedial method [9]. However, the 24 synthesis process is tedious and an unsatisfactory photocatalytic 25 performance under visible-light irradiation is still urgently needed 26 to be solved. Hence, it is essential to find an easier method and 27 more suitable material to fabricate ZnTe based composites with 28 better photocatalytic performance under visible-light irradiation.…”

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One-pot solvothermal synthesis of ZnTe/RGO nanocomposites and enhanced visible-light photocatalysis

Wang

Wei

et al. 2016

Chinese Chemical Letters

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“…The results showed that the graphene and WC particle addition improved the wear resistance of copper coating under dry sliding conditions. Introducing both WC and graphene deposited on the copper-coated matrix materials, the Cu/Graphene and Cu/Graphene/WC hybrid composite coatings resulted in getting remarkably high wear resistance in spite of porosity increment in the graphene introduced samples[31,32]. In spite of increasing surface roughness of the deposited layers reinforced with graphene, the decrease in the friction coefficient is significant.…”

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“…In spite of increasing surface roughness of the deposited layers reinforced with graphene, the decrease in the friction coefficient is significant. Because, increasing surface roughness of the materials in sliding wear results in increasing shear forces and therefore, high friction coefficients[31,33].…”

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Co-deposition of Cu/WC/graphene hybrid nanocomposites produced by electrophoretic deposition

Akbulut

Hatipoğlu

Algül

et al. 2015

Surface and Coatings Technology

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Synthesis, characterization and tribological properties of Cu/reduced graphene oxide composites

Cited by 101 publications

References 38 publications

Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

Facile and Green Reduction of Graphene Oxide by a Reduced Polyoxometalate and Formation of a Nanohybrid

One-pot solvothermal synthesis of ZnTe/RGO nanocomposites and enhanced visible-light photocatalysis

Co-deposition of Cu/WC/graphene hybrid nanocomposites produced by electrophoretic deposition

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