Abstract
In this study, eletrolitical copper powder (Cu) was initially mixed with the aqueous solution of graphene oxide (GO); later, the mixture underwent mechanical stirring for 1 h, vacuum filtration, and drying for 42 h. The final concentration of GO in the composite was 0.3%wt. Through scanning electron microscopy (SEM), it was possible to observe the homogeneous dispersion of graphene sheets between copper particles, without the presence of agglomerates. In addition, X-ray diffraction (XRD) of the pure samples and after mixing revealed that there was no oxidation of the copper and the absence of peaks related to other elements, confirming the high purity of the copper used. Still, by XRD, it was possible to analyze that the graphene oxide produced was formed by stacking layers of graphene owing to the appearance of a diffraction peak referring to the plane (002), which was confirmed by Raman spectroscopy performed in GO from the appearance of the 2D bands. Fourier transform infrared spectroscopy (FTIR) allowed the identification of the vibrational spectra referring to the hydroxyl, carbonyl, and epoxy functional groups in GO, confirming that the oxidation process was effective in inserting functional groups in the basal graphical plane. Through the GO thermogravimetric analysis (TGA), it was possible to identify a significant loss of mass of approximately 30% at temperatures below 100 °C; referring to the elimination of water molecules, the most stable functional groups were eliminated at temperatures between 600 °C and 800 °C.
Highlights
Publisher’sNote: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland
Among them are the obtaining of an optimized dispersion of graphene in the matrix, favoring a good adhesion between the components, and an attempt to minimize the agglomeration of graphene between grain boundaries; the latter has been one of the greatest challenges [14,15,16]
It is possible to identify the Graphene oxide (GO) sheets adhered to the surface of the copper particles and between the particles, showing adhesion between the copper and the GO
Summary
Publisher’sNote: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland. The interest in the study and development of routes to increase copper resistance has received special attention from researchers in recent years [1,2], especially the formation of composites with different types of addition of reinforcement material This is owing to this method having been effective in improving its mechanical properties, interfering less significantly in the electrical conductivity [3,4,5,6]. Graphene is a planar carbon monolayer whose atoms are arranged in two-dimensional form (2D) and is considered the most resistant material ever tested, obtaining tensile strength values of 130 GPa [9,10] It has high values of electrical (σ = 106 Ωcm−1) and thermal conductivity (5000 Wm−1 K−1) [11,12]. For a better understanding of the final properties of the composite in this study, thermal and microstructural analysis of
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