Successive change in work function of Al exposed to air

M. Uda*, Y. Nakagawa, T. Yamamoto, M. Kawasaki, A. Nakamura, T. Saito, K. Hirose

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Aluminum surface freshly shaven with a steel knife showed significant changes in work functions from 3.25 to 3.60 eV within one day. Successive changes of the work functions were measured in air using the open counter. XPS spectra showed no change fundamentally when the fresh Al surface was exposed to air for 1 min and 24 h. Molecular orbital calculations by use of the DV-X α method predicted an appearance of an additional local density of state near the Fermi edge when an Al-Al distance becomes large. Based on the experimental results and calculations, we proposed formation of an interface between an Al matrix and a surface oxide or oxyhydroxide, which has a stress induced density of state. This state appears at the beginning of air exposure and disappears after the lapse of time because such stress is released after rearrangement of surface and interface structures.

Original languageEnglish
Pages (from-to)767-771
Number of pages5
JournalJournal of Electron Spectroscopy and Related Phenomena
Publication statusPublished - 1998 Mar


  • Al
  • AlO(OH)
  • Interface
  • Molecular orbital calculation
  • Surface
  • Work function

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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