Superlubricating Graphene Films
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example i
[0028]In order to further investigate observed superlubricity in other environmental conditions, a series of tests was done by varying gas environments such as in inert Argon, hydrogen and in vacuum as well as by changing the tribo-pairs. Superlow friction was observed with DLC rubbing against graphene in dry nitrogen or inert argon environment.
[0029]Tribological measurements have been performed in different ambient environments, including air, dry nitrogen, inert argon, hydrogen, and in high vacuum. As shown in FIGS. 4A-4E, the tribo-pair was changed from a DLC coated ball against graphene coated flat to a graphene coated ball against DLC coated flat. Instead of dry nitrogen, inert Argon gas was used to see whether just a dry environment was adequate to show superlubric behavior. Superlubric behavior was observed in an inert Argon environment demonstrating superlubricity in graphene vs. DLC tribo-pair in dry environment. The coefficient of friction stays around 0.2-0.4 in air for g...
example ii
[0030]FIGS. 5A and 5B show a pin-on-disc friction coefficient test carried out on graphene coated ball against DLC flat in high vacuum environment showing COF of 0.06 with no measurable wear. None of the any existing solid lubricant materials demonstrated such lowest friction coefficient in vacuum. Graphene / DLC tribo-pair can be useful for tribological contacts in outer space applications and in vacuum conditions.
example iii
[0031]Different characterization techniques such as Raman spectroscopy, XPS, and ToF-SIMS, have been used to characterize chemical state of graphene and DLC contacts at the tribological interface between graphene and DLC before and after tribological tests. FIGS. 6A-6F describes results of Raman characterization of the wear track obtained from the DLC coated ball and from the wear track produced on the graphene coated Ni surface. These results were obtained from the DLC vs Graphene / Ni tribo-pair running in dry N2 atmosphere during initial 0.6 meters of sliding distance.
[0032]As shown in FIG. 6A in the optical image of the DLC ball, the wear is minimal; and there is no significant change in the DLC Raman signature obtained from inside and outside of the wear track (see FIGS. 6B and 6C). In the case of a wear track produced on the graphene coated Ni surface (see FIG. 6D), it was noted that the Raman signature taken from the inside of the wear track (FIG. 6F) indicates that the well or...
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