Serial Measurements of the Work Function of Metals Exposed to Air Using a Contact Potential Difference Method.

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  • NAKAJIMA Y.
    Riken Keiki Co., Ltd., Research Department
  • ISHIJI T.
    Riken Keiki Co., Ltd., Research Department
  • NAKANO N.
    Riken Keiki Co., Ltd., Research Department
  • UDA M.
    Laboratory for Materials Science and Technology, Waseda Univ. Department of Materials Sci. and Eng., Waseda Univ.

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Other Title
  • 接触電位差法による金属仕事関数の大気中連続測定
  • セッショク デンイサホウ ニ ヨル キンゾク シゴト カンスウ ノ タイキ チュウ レンゾク ソクテイ

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The work functions (WFs) of Al, Zn, Cd, Mo, Fe, Ni and Cu exposed to air were continuously measured in air using a contact potential difference method (CPD). Here, a gold plate was used as a reference material whose WF was measured precisely using an “electron spectroscopy in air” (ESA) method. The WFs of Al, Zn and Cd increased by approximately 0.1eV within 10 minutes after exposing the fresh surface of these metals to air. However, the WFs of Mo, Fe, Ni and Cu remained unchanged even after prolonged exposure to air. This can be explained by the influence of the stress in oxide films, which is induced by lattice misfit between the oxide films and bulk metals. The WFs measured by ESA and CPD were fundamentally the same for all these metals when they were exposed to air for 10 minutes or more.

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