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Adsorption of fluorine compound to the carbon surfaces and design of lubricant

Chemical analysis of the actual carbon surface was investigated by surface modification technique using fluorine compound prior to XPS measurements. The number of surface groups was obtained from the ratio of the fluorine and carbon in the XPS spectrum. Hydroxyl group is rich immediately after deposition but carbonyl concentration increases with exposure time. Adsorption of lube depends on the chemical composition of the functional groups. The FTIR spectra of the fluorinated compound film employed reveal the molecular orientation in the film. The weakly interacted lubricant has a random orientation and higher friction, however, friction is low for the strongly adsorbed lubricant to the surface with high orientation. Based on the chemical analysis and film orientation the newly synthesized lubricant has a good friction performance.