Degradation of Graphene in High- and Low-Humidity Air, and Vacuum Conditions at 300-500 K

Graphene is a fundamental unit of carbon materials and, thus, primary sp -bonded carbon material. Graphene is, however, easily broken macroscopically despite high mechanical strength, although its natural degradation has rarely been considered. In this work, we evaluate the natural degradation of tw...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-01, Vol.14 (2), p.166
Main Authors: Kawabata, Shunsuke, Seki, Ryuichi, Watanabe, Takumi, Ohba, Tomonori
Format: Article
Language:English
Subjects:
Analysis
Carbon
Chemical vapor deposition
Chemisorption
Copper
Decomposition (Chemistry)
defects
Degradation
Electrons
Graphene
Humidity
Lasers
Mechanical properties
Methods
natural degradation
Oxidation
Oxidizing agents
Oxygen
Properties
Spectrum analysis
Structure
Temperature
thermal stability
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Summary:Graphene is a fundamental unit of carbon materials and, thus, primary sp -bonded carbon material. Graphene is, however, easily broken macroscopically despite high mechanical strength, although its natural degradation has rarely been considered. In this work, we evaluate the natural degradation of two-layer graphene in vacuo, in low-humidity air, and in high-humidity air at 300, 400, 450, and 500 K. Over 1000 days of degradation at 300 K, the graphene structure was highly maintained in vacuo, whereas the layer number of graphene tended to decrease in high- and low-humidity air. Water was slightly reacted/chemisorbed on graphene to form surface oxygen groups at 300 K. At 450 and 500 K, graphene was moderately volatilized in vacuo and was obviously oxidized in high- and low-humidity air. Surprisingly, the oxidation of graphene was more suppressed in the high-humidity air than in the low-humidity air, indicating that water worked as an anti-oxidizer of graphene by preventing the chemisorption of oxygen on the graphene surface.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano14020166