Preparation and influencing factors of graphene-silver nanocomposites

Bing-Bing, Fan; Guo, Huanhuan; Wen, Li; Jia, Yu; Zhang, Rui

doi:10.7498/aps.62.148101

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…Graphene has a unique structure (a hexagonal honeycomb lattice composed of carbon atoms, with s–p hybrid orbitals) and excellent mechanical properties (the theoretical elastic modulus of graphene is as high as 1 TPa, and its fixed tensile strength is 130 GPa), Refs. [ 5 , 6 , 7 , 8 ], which can be used as a reinforcing phase to greatly improve the mechanical properties such as strength and stiffness, as well as physical properties such as conductivity and thermal conductivity of metal materials, thereby obtaining high-performance structural and functional materials [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperatures and Graphene on the Mechanical Properties of the Aluminum Matrix: A Molecular Dynamics Study

Huang

Chen

et al. 2023

Materials

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Graphene has become an ideal reinforcement for reinforced metal matrix composites due to its excellent mechanical properties. However, the theory of graphene reinforcement in graphene/aluminum matrix composites is not yet well developed. In this paper, the effect of different temperatures on the mechanical properties of the metal matrix is investigated using a classical molecular dynamics approach, and the effects of the configuration and distribution of graphene in the metal matrix on the mechanical properties of the composites are also described in detail. It is shown that in the case of a monolayer graphene-reinforced aluminum matrix, the simulated stretching process does not break the graphene as the strain increases, but rather, the graphene and the aluminum matrix have a shearing behavior, and thus, the graphene “pulls out" from the aluminum matrix. In the parallel stretching direction, the tensile stress tends to increase with the increase of the graphene area ratio. In the vertical stretching direction, the tensile stress tends to decrease as the percentage of graphene area increases. In the parallel stretching direction, the tensile stress of the system tends to decrease as the angle between graphene and the stretching direction increases. It is important to investigate the effect of a different graphene distribution in the aluminum matrix on the mechanical properties of the composites for the design of high-strength graphene/metal matrix composites.

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Section: Introductionmentioning

confidence: 99%

Effect of Temperatures and Graphene on the Mechanical Properties of the Aluminum Matrix: A Molecular Dynamics Study

Huang

Chen

et al. 2023

Materials

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Physicochemical and antibacterial properties of Graphene Oxide-Silver/Graphene Oxide/Chitosan composite wound dressing

Liu

Wang

et al. 2023

Preprint

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Graphene oxide was prepared by the modified Hummers method and ultrasonic treatment, ammoniacal silver solution and glucose were added into graphene oxide suspension to prepare graphene oxide-silver (GO-Ag) nanoparticles. And then the achieved GO-Ag nanoparticles were incorporated into chitosan and graphene oxide to prepare graphene oxide-silver/graphene oxide /chitosan(GO-Ag/GO/CS) composites. The structure and properties of GO-Ag/GO/CS composite have been investigated by XRD, IR, TG, Tensile test, cytotoxicity test and antibacterial test. XRD and IR analysis indicated that GO-Ag was successfully compounded with graphene oxide and chitosan, the structure of GO-Ag was unchanged after being incorporation. Tensile test showed that the incorporation of graphene oxide into chitosan matrix can effectively improve the tensile strength of GO-Ag/GO/CS composite, especially the wet-state tensile strength. When incorporated of 4wt% GO into chitosan matrix, the wet-state tensile strengths of GO-Ag/GO/CS were improved by 214.3% compared with chitosan matrix. Thermogravimetric analysis indicated that the incorporation of graphene oxide has a slight effect on the thermal stability of CS. The results of cytotoxicity test showed that the cytotoxicity levels of GO-Ag/GO/CS composites were all in the range of non-cytotoxic when the dosages of GO-Ag were changing from 3.0 mg to 6.0 mg, which satisfied the safety standards of biomaterials. The bacteriostatic rate of GO-Ag/GO/CS-5 group (contain 5mg GO-Ag) against Staphylococcus aureus can reach 98.31%, showing excellent bacteriostatic effect, which could be used for further experimental study.

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Synthesis of SnO2 quantum dots/graphene composite and its photocatalytic performance

Ye¹,

Chen²,

Bu³

et al. 2015

Acta Phys. Sin.

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With SnCl4·5H2O and graphene oxide as raw materials and aqueous solution of ethanol as the solvent, we have prepared SnO2 quantum dots (diameter about 3-5 nm)/graphene nanocomposites using a facile hydrothermal method in one step, and solved the reunion of quantum dots successfully. The visible-light-driven photocatalytic efficiency of SnO2 quantum dots depends to a great extent on their dispersity. Because of the large-sized two-dimensional surface, the graphene sheet could behave as a solid support for quantum dots through interfacial interaction to avoid particle aggregation. Composites of SnO2 quantum dot/graphene show a great photocatalytic performance in visible light, and the morphology and structure of the product are characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared Spectrometer (FT-IR) and other techniques. The optical properties are investigated by using UV-visible (UV-vis) absorption spectrum. Additionally, the photocatalytic activity of the product is measured by the degradation of rhodamine-B dye solution in visible light. Results show that the preparation of samples with high catalytic activity in visible light, the shift in the optical response of composites may produce a positive effect on the improvement of photocatalytic efficiency in UV to visible spectral range Moreover, owing to its special π-conjugation structure, large specific surface area as well as high conductivity, graphene can enhance the photocatalytic activity. Compared with the pure SnO2, pure graphene catalytic performance is greatly improved in visible light, its excellent photocatalytic activity is due to the combination of strong absorption and effective separation of photogenerated carriers in the samples. Finally, the formation mechanism of the composite and its photocatalytic mechanism are studied.

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Preparation and influencing factors of graphene-silver nanocomposites

Cited by 6 publications

References 24 publications

Effect of Temperatures and Graphene on the Mechanical Properties of the Aluminum Matrix: A Molecular Dynamics Study

Effect of Temperatures and Graphene on the Mechanical Properties of the Aluminum Matrix: A Molecular Dynamics Study

Physicochemical and antibacterial properties of Graphene Oxide-Silver/Graphene Oxide/Chitosan composite wound dressing

Synthesis of SnO2 quantum dots/graphene composite and its photocatalytic performance

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