Electron-stimulated oxidation of Al(111) by oxygen at low temperatures: Mechanism of enhanced oxidation kinetics

“…It has been shown that a significant impact on the oxidation kinetics can be achieved by either directly applying an external electric field [3][4][5][6][7][8][9][10] or electron bombardment of the oxide surface [11][12][13]. We demonstrate here that the actual value of the self-generated electrostatic potential (designated as the kinetic potential [14]) can deviate from the Mott potential and is tunable by varying the oxygen pressure during oxidation which provides control of the limiting thickness of the oxide film.…”

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confidence: 99%

Tuning the Limiting Thickness of a Thin Oxide Layer on Al(111) with Oxygen Gas Pressure

et al. 2011

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We report an x-ray photoelectron spectroscopy study of the oxidation of Al(111) surfaces at room temperature, which reveals that the limiting thickness of an aluminum oxide film can be tuned by using oxygen pressure. This behavior is attributed to a strong dependence of the kinetic potential on the oxygen gas pressure. The coverage of oxygen anions on the surface of the oxide film depends on the gas pressure leading to a pressure dependence of the kinetic potential. Our results indicate that a significantly large oxygen pressure (>1 Torr) is required to develop the saturated surface coverage of oxygen ions, which results in the maximum kinetic potential and therefore the saturated limiting thickness of the oxide film.

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“…¦ÔÎË ÏÂÕÓËÙÞ ÂÒÒÓÑÍ-ÔËÏËÓÑÄÂÕß ËØ ÅÎÂÄÐÞÏË àÎÇÏÇÐÕÂÏË, ÕÑ ¢ÑÎßÛËÐÔÕÄÑ ÓÂÔÚÈÕÑÄ AEÎâ AEËÐÂÏËÍË àÎÇÍÕÓÑÐÑÄ, ÑÃÔÖÉAEÂÇÏÞØ Ä ÒÑÔÎÇAEÖáÜËØ ÓÂÊAEÇÎÂØ, ÃÞÎÑ ÄÞÒÑÎ-ÐÇÐÑ Ä ÃÂÊËÔÇ ÒÓÑAEÖÍÕ-ÑÓÃËÕÂÎÇÌ. ¿ÕÑ ®´°-³³ GW-ÓÂÔÚÈÕÞ AEÎâ ÄÓÇÏÈÐ ÉËÊÐË ÄÑÊÃÖÉAEÈÐÐÞØ àÎÇÍÕÓÑÐÑÄ Ä Cu, Ag, Au [147], Ä Nb, Mo, Rh, Pd, Ag [111], Ä Nb Ë Al [110]. ²ÇÊÖÎßÕÂÕÞ ®´°-³³ GWT-ÓÂÔÚÈÕÑÄ ÃÞÎË ÑÒÖÃÎËÍÑ-ÄÂÐÞ AEÎâ ÄÓÇÏÇÐË ÉËÊÐË àÎÇÍÕÓÑÐÑÄ Ä Fe Ë Ni [46,148], Ä Pd, Ta, Al [47], Ä V, Nb, Ta, Mo, W, Rh, Ir [149], AEÎâ AEÎËÐÞ ÔÄÑÃÑAEÐÑÅÑ ÒÓÑÃÇÅÂ àÎÇÍÕÓÑÐÑÄ Ä Fe, Ni, Pt, Au [48].…”

Section: ®ñAeçîë Aeîâunclassified

“…±ÇÓÄÞÇ ÓÂÔÚÈÕÞ ÄÓÇÏÇÐË ÉËÊÐË, Ô ÖÔÓÇAEÐÇÐËÇÏ ÒÑ ÄÑÎÐÑÄÑÏÖ ÄÇÍÕÑÓÖ, ÃÞÎË ÄÞÒÑÎÐÇÐÞ¨ÖÍÑÄÞÏ Ë AEÓ. ÏÇÕÑAEÑÏ ®´°-³³ GW AEÎâ Nb [110,111] [48].…”

Section: ¥ëðâïëíâ àîçíõóñðñä ä ðçïâåðëõðþø òçóçøñAeðþø ïçõâîîâøunclassified