Effect of Oxygen Adsorption on Adhesion of W to Au Studied by Field Ion Microscopy |
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| Authors: | Nobuo Ohmae Masataka Umeno Kenji Tsubouchi |
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| Affiliation: | 1. Osaka University , Suita, Osaka, 565, Japan;2. Sumitomo Metal Industries, Ltd. , Amagasaki, Hyogo, 660, Japan |
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| Abstract: | A field ion microscope has been used to investigate the influence of oxygen adsorption on adhesion of W to Au. An adhesion contact in ultrahigh vacuum of the field ion microscope was carried out using a W tip either with or without oxygen adsorption. It was found that adhesion force decreased with increasing oxygen exposures up to 60 Langmuirs (L). With an oxygen exposure of 16 L, an intermediate adhesion resulted. Adhesion is thus dependent upon the coverage of oxygen. The depth of adhesion-induced lattice defects was studied using the field evaporation technique. Over 200 L, adhesion force was not detectable, nor was distortion of W atoms. |
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