کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9594889 | 1507960 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cu2O(1Â 1Â 0) formation on Co3O4(1Â 1Â 0) induced by copper impurity segregation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The impurities: K, Ca, Na, and Cu segregated to the surface after prolonged heating to 630Â K. K, Ca and Na could easily be removed by routine cleaning procedures and did not affect the Co3O4(1Â 1Â 0) structure or stoichiometry detectably in the submonolayer levels at which they were observed. However, the copper impurity resulted in the formation of a Cu2O(1Â 1Â 0) overlayer, with the accompanying reduction of the spinel surface to a rocksalt metal monoxide-like surface. The copper oxide formed a distorted hexagonal overlayer incommensurate with that of the Co3O4(1Â 1Â 0) stoichiometric surface and with periodic spacings of 3.86Â Ã
 ± 0.2 Ã
in the ã0Â 0Â 1ã and 4.10Â Ã
 ± 0.2 Ã
in the ã1¯10ã directions in agreement with Cu2O(1 1 0) bulk termination. The Co3O4(1 1 0) substrate could not be fully re-oxidized until all detectable copper had been removed from the surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 599, Issues 1â3, 30 December 2005, Pages 27-40
Journal: Surface Science - Volume 599, Issues 1â3, 30 December 2005, Pages 27-40
نویسندگان
S.C. Petitto, M.A. Langell,