کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9595210 | 1507970 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation of epitaxial oxide nanodots on oxide substrate: Cu2O on SrTiO3(1Â 0Â 0)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
X-ray photoelectron spectroscopy analysis during the oxygen plasma assisted molecular beam epitaxy, combined with atomic force microscopy and scanning Auger microscopy have been used to evaluate the mechanism of single-phase Cu2O nanodot formation on the SrTiO3(1Â 0Â 0) surface. Formation of pure crystalline Cu2O nanodots occurs rather in a narrow growth parameter window, outside which a coexistence of the multiple phases has been observed. Cuprous oxide nanodots on the SrTiO3(1Â 0Â 0) substrate follow a growth mechanism which differs significantly from the growth modes observed for the majority of semiconductor quantum dots. Growth starts without wetting layer formation with appearance of well-ordered truncated square-based nanodots at submonolayer coverages. At the initial stages of growth, the nanodot size is only weakly changes with coverage and exponentially scales with temperature. After reaching a critical, temperature dependent dot density (â¼1013Â cmâ2 for 760Â K growth temperature), growth of mid-sized nanoclusters starts through coalescence, which is eventually followed by large dome-shaped cluster formation at higher coverages. The coexistence of the different types of the clusters at high coverages results in a multimodal distribution of sizes and shapes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 589, Issues 1â3, 1 September 2005, Pages 120-128
Journal: Surface Science - Volume 589, Issues 1â3, 1 September 2005, Pages 120-128
نویسندگان
I. Lyubinetsky, A.S. Lea, S. Thevuthasan, D.R. Baer,