Abstract
Chemical vapor deposition (CVD) graphene is reported to effectively prevent the penetration of outer factors and insulate the underneath metals, hence achieving an anticorrosion purpose. However, there is little knowledge about their characteristics and corresponding corrosion properties, especially for those prepared under different parameters at low temperatures. Using electron cyclotron resonance chemical vapor deposition (ECR-CVD), we can successfully prepare graphene nanostructures on copper (Cu) at temperatures lower than 600 °C. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and potentiodynamic polarization measurements were used to characterize these samples. In simulated seawater, i.e., 3.5 wt.% sodium chloride (NaCl) solution, the corrosion current density of one graphene-coated Cu fabricated at 400 °C can be 1.16 × 10−5 A/cm2, which is one order of magnitude lower than that of pure Cu. Moreover, the existence of tall graphene nanowalls was found not to be beneficial to the protection as a consequence of their layered orientation. These correlations among the morphology, structure, and corrosion properties of graphene nanostructures were investigated in this study. Therefore, the enhanced corrosion resistance in selected cases suggests that the low-temperature CVD graphene under appropriate conditions would be able to protect metal substrates against corrosion.
Highlights
Graphene has received numerous attentions since it was first detached from graphite through mechanical exfoliation and used in a variety of applications [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
The existence of tall graphene nanowalls was found not to be beneficial to the protection as a consequence of their layered orientation. These correlations among the morphology, structure, and corrosion properties of graphene nanostructures were investigated in this study
Hofmann et al reported on the chemical vapor deposition (CVD)-enabled graphene manufacture and technology in 2014 [17]
Summary
Graphene has received numerous attentions since it was first detached from graphite through mechanical exfoliation and used in a variety of applications [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. Pang et al discussed the CVD growth of one-dimensional (1D) and two-dimensional (2D) sp carbon nanomaterials, i.e., basically carbon nanotube and graphene, in 2015 [16]. Their growth mechanisms and dynamics were compared. Hofmann et al reported on the chemical vapor deposition (CVD)-enabled graphene manufacture and technology in 2014 [17]. It mentioned the pressure and materials gap, the microstructure of CVD graphene films, and the catalyst−carbon phase diagram. Naghdi et al reviewed the catalytic, catalyst-free, roll-to-roll, and low-temperature CVD growth of graphene in 2018 [18]. Chen et al showed the scalable CVD growth of three-dimensional (3D)
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