<i>We report the surface chemistry of highly ordered pyrolytic graphite (HOPG) upon exposure to ambient air, as analyzed using Ultra-Violet Photoelectron Spectroscopy (UPS). UPS measurements were collected from freshly-cleaved HOPG in ultra-high vacuum (UHV) and after exposures to ambient air. We observed an immediate contamination of freshly-cleaved HOPG surface upon exfoliation in ambient air, followed by further growth and changing composition during longer air exposures. The advantage of UPS over XPS in the surface analysis of carbon substrates is highlighted and used for contamination characterization.</i>

Ultra-violet photoelectron spectroscopy studies on HOPG exfoliations in ambient air and ultra-high vacuum

256th National Meeting (2018)

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