Evolution, kinetics, energetics, and environmental factors of graphene degradation on silicon dioxide
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
Recent studies have qualitatively shown that the oxidative stability of monolayer graphene integrated on oxides is relatively poor. Here, the evolution, kinetics, and energetics of this degradation are quantified. Specifically, the deterioration of graphene on SiO2 is studied in grain interiors and at grain boundaries in ambient air, dry air and nitrogen between 473 and 673 K, using spatially and temporally resolved in situ Raman spectroscopy in addition to electron microscopy and charge transport measurements. The grain interiors of chemical vapor deposition (CVD) grown graphene monolayers oxidize with an activation energy of 0.63 ± 0.05 eV in ambient air (15 000 ppm H2O). This energy increases to 1.85 ± 0.17 eV in dry air, whereas degradation is immeasurable in nitrogen and for multilayers even in ambient air. Gasification at grain boundaries in a CVD monolayer proceeds at a rate of (1.08 ± 0.02) × 10-1 nm s-1 at 673 K with an activation energy EA = 1.14 ± 0.10 eV in ambient air. The more facile degradation of the monolayer grain interiors in ambient air indicates the role of the substrate in decreasing the stability against oxidation. The electrical transport mobility decays with an activation rate similar to that of grain interiors. In conclusion, these results can be used to quantitatively predict graphene oxidation and gasification on SiO2 in different environments and temperatures.
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0006414
- OSTI ID:
- 1457358
- Journal Information:
- Nanoscale, Vol. 7, Issue 14; ISSN 2040-3364
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Enhanced Photochemical/Electrochemical Performance of Graphene Benefited from Morphological Change as Substrate of Typical Composites
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journal | April 2018 |
Highly uniform monolayer graphene synthesis via a facile pretreatment of copper catalyst substrates using an ammonium persulfate solution
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journal | January 2019 |
Hall sensors batch-fabricated on all-CVD h-BN/graphene/h-BN heterostructures | text | January 2018 |
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