C1s Peak of Adventitious Carbon Aligns to the Vacuum Level: Dire Consequences for Materials Bonding Assignment by Photoelectron Spectroscopy [Elektronisk resurs]
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Greczynski, Grzegorz (författare)
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Hultman, Lars (författare)
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- Linköpings universitet Institutionen för fysik, kemi och biologi (utgivare)
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Alternativt namn: Linköpings universitet. Institutionen för fysik och mätteknik
(tidigare namn)
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Alternativt namn: Linköpings universitet. Institutionen för fysik och mätteknik, biologi och kemi
(tidigare namn)
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Alternativt namn: IFM
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Alternativt namn: Engelska : Department of Physics and Measurement Technology, Biology and Chemistry
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Alternativt namn: Engelska : Department of Physics, Chemistry and Biology
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Linköpings universitet Tekniska fakulteten (utgivare)
- WILEY-V C H VERLAG GMBH 2017
- Engelska.
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Ingår i: ChemPhysChem. - 1439-4235. ; 18:12, 1507-1512
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Sammanfattning
Ämnesord
Stäng
- The C1s signal from ubiquitous carbon contamination on samples forming during air exposure, so called adventitious carbon (AdC) layers, is the most common binding energy (BE) reference in X-ray photoelectron spectroscopy studies. We demonstrate here, by using a series of transition-metal nitride films with different AdC coverage, that the BE of the C1s peak E-B(F) varies by as much as 1.44 eV. This is a factor of 10 more than the typical resolvable difference between two chemical states of the same element, which makes BE referencing against the C1s peak highly unreliable. Surprisingly, we find that C1s shifts correlate to changes in sample work function phi(SA), such that the sum E-B(F) + phi(SA) is constant at 289.50 +/- 0.15 eV, irrespective of materials system and air exposure time, indicating vacuum level alignment. This discovery allows for significantly better accuracy of chemical state determination than offered by the conventional methods. Our findings are not specific to nitrides and likely apply to all systems in which charge transfer at the AdC/substrate interface is negligible.
Ämnesord
- Natural Sciences (hsv)
- Physical Sciences (hsv)
- Condensed Matter Physics (hsv)
- Naturvetenskap (hsv)
- Fysik (hsv)
- Den kondenserade materiens fysik (hsv)
Indexterm och SAB-rubrik
- analytical methods; binding energy; surface analysis; surface chemistry; X-ray photoelectron spectroscopy
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