Journal
ACS NANO
Volume 7, Issue 8, Pages 6939-6947Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn402150t
Keywords
graphene; corrosion; oxidation; copper; long-term
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Funding
- Taiho Kogyo Tribology Research Foundation
- AFOSR [FA9550-13-1-0083]
- ONR [N000141310575]
- Mascaro Center for Sustainable Innovation
- Central Research and Development Fund of the University of Pittsburgh
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This paper reports the enhancement of long-term oxidation of copper at room temperature by a graphene coating. Previous studies showed that graphene is an effective anticorrosion barrier against short-term thermal and electrochemical oxidation of metals. Here, we show that a graphene coating can, on the contrary, accelerate long-term oxidation of an underlying copper substrate in ambient atmosphere at room temperature. After 6 months of exposure in air, both Raman spectroscopy and energy-dispersive X-ray spectroscopy indicated that graphene-coated copper foil had a higher degree of oxidation than uncoated foil, although X-ray photoelectron spectroscopy showed that the surface,, concentration of Cu2+ was higher for the uncoated sample. In addition, we observed that the oxidation of graphene-coated Copper foil was not homogeneous and occurred within micrometer sized domains. The corrosion enhancement effect of graphene was attributed to its ability to promote electrochemical corrosion of copper.
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