Long-Term Passivation of Strongly Interacting Metals with Single-Layer Graphene
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- 作者：Robert S. Weatherup ; Lorenzo D鈥橝rsi茅 ; Andrea Cabrero-Vilatela ; Sabina Caneva ; Raoul Blume ; John Robertson ; Robert Schloegl ; Stephan Hofmann
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：November 18, 2015
- 年：2015
- 卷：137
- 期：45
- 页码：14358-14366
- 全文大小：543K
- ISSN：1520-5126
文摘
The long-term (>18 months) protection of Ni surfaces against oxidation under atmospheric conditions is demonstrated by coverage with single-layer graphene, formed by chemical vapor deposition. In situ, depth-resolved X-ray photoelectron spectroscopy of various graphene-coated transition metals reveals that a strong graphene鈥搈etal interaction is of key importance in achieving this long-term protection. This strong interaction prevents the rapid intercalation of oxidizing species at the graphene鈥搈etal interface and thus suppresses oxidation of the substrate surface. Furthermore, the ability of the substrate to locally form a passivating oxide close to defects or damaged regions in the graphene overlayer is critical in plugging these defects and preventing oxidation from proceeding through the bulk of the substrate. We thus provide a clear rationale for understanding the extent to which two-dimensional materials can protect different substrates and highlight the key implications for applications of these materials as barrier layers to prevent oxidation.