Journal
NANO LETTERS
Volume 21, Issue 2, Pages 1161-1168Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04724
Keywords
few-layer graphene; chemical vapor deposition; anticorrosion; grain boundaries; polycrystalline
Categories
Funding
- National Key R&D Program of China [2018YFA0305800]
- National Natural Science Foundation of China (NSFC) [51772145]
- Natural Science Foundation of Jiangsu Province [BK20180003]
- 333 high level talent training project of Jiangsu and JiangHai talent program of Nantong
- NSFC [51772135, 61604061, 21703081, 52002147]
- Welch Foundation [F-1959-20180324]
- UT Austin
- Research Grant Council of Hong Kong SAR [16204815]
- NSFC-RGC Joint Research Scheme [N_HKUST607/17]
- Innovation and Technology Commission [ITC-CNERC14SC01]
- Ministry of Education of China [6141A02022516]
- Natural Science Foundation of Guangdong Province, China [2019A1515010482]
- Fundamental Research Funds for the Central Universities [21618311, 11619103, 21618405]
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The study reveals that using atomically thin, polycrystalline few-layer graphene (FLG) as a protective coating film can effectively prevent metal corrosion in atmospheric environments by exploiting the misalignment of grain boundaries and energy barrier to corrosive molecules diffusion.
Corrosion of metals in atmospheric environments is a worldwide problem in industry and daily life. Traditional anticorrosion methods including sacrificial anodes or protective coatings have performance limitations. Here, we report atomically thin, polycrystalline few-layer graphene (FLG) grown by chemical vapor deposition as a long-term protective coating film for copper Cu). A six-year old, FLG-protected Cu is visually shiny and detailed material characterizations capture no sign of oxidation. The success of the durable anticorrosion film depends on the misalignment of grain boundaries between adjacent graphene layers. Theoretical calculations further found that corrosive molecules always encounter extremely high energy barrier when diffusing through the FLG layers. Therefore, the FLG is able to prevent the corrosive molecules from reaching the underlying Cu surface. This work highlights the interesting structures of polycrystalline FLG and sheds insight into the atomically thin coatings for various applications.
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