期刊
NATURE MATERIALS
卷 11, 期 6, 页码 544-549出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3316
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资金
- National Science Foundation (NSF) [CMMI-1100290, DMR-0820382, DMR-0706031]
- Samsung Advanced Institute of Technology (SAIT)
- Office of Basic Energy Sciences of the US Department of Energy [DE-FG02-06ER46293, DE-SC001951]
- U.S. Department of Energy (DOE) [DE-FG02-06ER46293] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [820382] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1100290] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0946869] Funding Source: National Science Foundation
Graphene oxide potentially has multiple applications. The chemistry of graphene oxide and its response to external stimuli such as temperature and light are not well understood and only approximately controlled. This understanding is crucial to enable future applications of this material. Here, a combined experimental and density functional theory study shows that multilayer graphene oxide produced by oxidizing epitaxial graphene through the Hummers method is a metastable material whose structure and chemistry evolve at room temperature with a characteristic relaxation time of about one month. At the quasi-equilibrium, graphene oxide reaches a nearly stable reduced O/C ratio, and exhibits a structure deprived of epoxide groups and enriched in hydroxyl groups. Our calculations show that the structural and chemical changes are driven by the availability of hydrogen in the oxidized graphitic sheets, which favours the reduction of epoxide groups and the formation of water molecules.
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