کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5421912 | 1507895 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Wet-transfer of CVD-grown graphene onto sulfur-protected W(110)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Graphene, grown by chemical vapor deposition, is transferred onto W(110) surface with a protective sulfur layer. Sulfur was adsorbed on the W(110) surface in ultrahigh vacuum (UHV) by reaction with H2S at 1 Ã 10â 8 Torr at 800 °C. Low-energy electron diffraction and scanning tunneling microscopy (STM) measurements show that an ordered sulfur adsorbate layer is formed on W(110) with a 1 Ã 5 superstructure. The monolayer of sulfur subsequently protects the W(110) surface from oxidation during wet-transfer of CVD-grown graphene. After the graphene transfer, the sample is re-introduced to UHV and characterized by STM, Auger electron spectroscopy, x-ray and ultraviolet photoemission spectroscopy. The adsorbed sulfur layer prevents carbide formation, by reaction of graphene with tungsten, to annealing temperatures of at least ~ 750 °C in vacuum. Finally, photoemission measurements of the graphene/S/W(110) interface indicates p-type doping of graphene due to charge transfer at the interface as a consequence of the high work function of the W(110)-S substrate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 634, April 2015, Pages 9-15
Journal: Surface Science - Volume 634, April 2015, Pages 9-15
نویسندگان
Arjun Dahal, Rafik Addou, Horacio Coy-Diaz, Matthias Batzill,