کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9594973 | 1507965 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface alloying of immiscible metals: Mo on Au(1Â 1Â 1) studied by STM
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Alloy formation and growth of regular arrays of Mo nanostructures were discovered during studies of Mo growth on Au(1Â 1Â 1) surfaces. The behavior of Mo deposited via physical vapor deposition was studied as a function of temperature using scanning tunneling microscopy (STM) and Auger electron spectroscopy (AES). Between 300Â K and 450Â K, regular arrays of Mo clusters form by preferential nucleation of Mo at elbow sites of the herringbone reconstruction. The Mo clusters are 1 or 2 atomic layers high, and are stable upon annealing up to at least 600Â K. For deposition temperatures at or above 525Â K, substitutional surface alloying competes with nucleation on terrace sites. The formation of a surface alloy is inferred from the evolution of a serrated step-edge morphology caused by attachment of ejected Au atoms, and a decrease of the Mo surface coverage, as well as the appearance of vacancy islands in the Au surface after chemically-driven de-alloying of Mo. The formation of a Mo-Au surface alloy is quite remarkable as Mo and Au are bulk immiscible. Even surface alloying would not be expected from the viewpoint of stress relaxation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 594, Issues 1â3, 1 December 2005, Pages 221-230
Journal: Surface Science - Volume 594, Issues 1â3, 1 December 2005, Pages 221-230
نویسندگان
Monika M. Biener, Juergen Biener, Richard Schalek, Cynthia M. Friend,