Abstract
Reduced graphene oxide has attracted numerous interests due to its unique, superior electronic, optical, mechanical, and chemical properties. An epoxy resin with excellent mechanical and electrical properties can be obtained by doping with reduced graphene oxide to enhance the function of the polymer. Here, we prepared a uniform reduced graphene oxide/epoxy resin coating with a different reduced graphene oxide content and characterized it using a field-emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), Raman, and Fourier transform infrared spectrometer (FTIR). Furthermore, the spectral characteristics of the composite coating in the terahertz band were discussed. The cross-sectional SEM results show that a fold structure with ductile failure was intensively formed due to the compatibility of graphene and polymer materials. Both the Raman G and Raman 2D peaks of reduced graphene oxide were confirmed using Raman spectrum testing. The diffraction peak of reduced graphene oxide at 24° disappeared within the reduced graphene oxide/epoxy resin coating, and a wide diffraction peak of the amorphous structure was formed together. Additionally, the intensity of the Raman spectrum increased significantly with increased reduced graphene oxide content, thereby making the surface electrical resistance of the coatings decrease exponentially. Additionally, the intensity of the terahertz time-domain signal and frequency-domain power spectrum linearly reduced with increased reduced graphene oxide concentration. However, the terahertz absorption coefficient and refractive index both increased gradually with increased reduced graphene oxide doping due to increased orientation polarization in the composite coating.
Highlights
We mainly focused on the physical and chemical characterization of reduced graphene oxide (rGO)/Epoxy resin (EP) composite coating filled with different concentrations of rGO additives
We investigated the effect of nanographene conductive additives on the morphology, electrical conductivity, and terahertz spectroscopy of the EP matrix
Results show that the nanographene conductive additives dispersed into the EP matrix and formed a good combination due to the compatibility of both materials
Summary
RGO is considered a promising additive material for improving the mechanical, physical, chemical, and thermal stability of substrate coatings (e.g., strength, modulus, friction, adhesion, and wear resistance) [4,5,6,7]. Epoxy resin (EP) is widely used as functional coatings for civil aircraft due to its excellent corrosion resistance, mechanical properties, and chemical stability. The THz spectral characteristics of internal impurities, especially for carbon additives, in composite materials, are affected by various factors, such as polarization directions and/or electrical conductivity, type and amount of filler, geometry, and dispersibility of additives [22,23,24]. We explained the THz absorption enhancement mechanism of rGO/EP composites
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