Selective release of less defective graphene during sliding of an incompletely reduced graphene oxide coating on steel
| Autor: | Mingyu Gao, Shusheng Xu, Yuzhen Liu, Dae Eun Kim, Chang Lae Kim, Kyeong Hee Kang |
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| Rok vydání: | 2018 |
| Předmět: |
Normal force
Materials science Graphene Oxide Humidity 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Coating X-ray photoelectron spectroscopy chemistry law engineering General Materials Science Redistribution (chemistry) Defective graphene Composite material 0210 nano-technology |
| Zdroj: | Carbon. 134:411-422 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2018.04.022 |
| Popis: | Recently, graphene has been gaining a lot of attention as a coating material that can be effectively utilized in reducing friction and wear of sliding components. In order to fully exploit the lubricious properties of graphene, the variation in the structure of the coating as sliding proceeds against a counter surface needs to be understood clearly. In this study, the structural evolution during sliding of an incompletely reduced graphene oxide (rGO) coating deposited on the 304 stainless steel by an electrodynamic spraying process was investigated. Experimental results showed that this coating possessed a low friction coefficient, below 0.05, under either low humidity air or dry N2 gas condition. The micro-Raman and XPS analyses systematically revealed that less defective graphene structure was selectively released at the center region of the wear track. It was determined that the redistribution of graphene with different structures within the wear track was induced by frictional interaction at the sliding interface. Furthermore, it was determined that the degree of release of less defective graphene structure was proportional to both the applied normal force and sliding cycles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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