Ordered vacancy network induced by the growth of epitaxial graphene on Pt(111).
نویسندگان
چکیده
We have studied large areas of (√3×√3)R30° graphene commensurate with a Pt(111) substrate. A combination of experimental techniques with ab initio density functional theory indicates that this structure is related to a reconstruction at the Pt surface, consisting of an ordered vacancy network formed in the outermost Pt layer and a graphene layer covalently bound to the Pt substrate. The formation of this reconstruction is enhanced if low temperatures and polycyclic aromatic hydrocarbons are used as molecular precursors for epitaxial growth of the graphene layers.
منابع مشابه
Nickel carbide as a source of grain rotation in epitaxial graphene.
Graphene has a close lattice match to the Ni(111) surface, resulting in a preference for 1 × 1 configurations. We have investigated graphene grown by chemical vapor deposition (CVD) on the nickel carbide (Ni(2)C) reconstruction of Ni(111) with scanning tunneling microscopy (STM). The presence of excess carbon, in the form of Ni(2)C, prevents graphene from adopting the preferred 1 × 1 configurat...
متن کاملConstruction of 2D atomic crystals on transition metal surfaces: graphene, silicene, and hafnene.
The synthesis and structures of graphene on Ru(0001) and Pt(111), silicene on Ag(111) and Ir(111) and the honeycomb hafnium lattice on Ir(111) are reviewed. Epitaxy on a transition metal (TM) substrate is a pro-mising method to produce a variety of two dimensional (2D) atomic crystals which potentially can be used in next generation electronic devices. This method is particularly valuable in th...
متن کاملDefect structures on epitaxial Fe3O4„111... films
Epitaxial Fe3O4~111! films were grown onto a Pt~111! substrate by repeated cycles of iron deposition and subsequent oxidation in 10 mbar oxygen. A previous low energy electron diffraction ~LEED! intensity analysis revealed the regular Fe3O4~111! surface to expose 1 4 monolayer Fe atoms over a close-packed oxygen layer underneath. With scanning tunneling microscopy ~STM! a hexagonal lattice of p...
متن کاملEPITAXIAL GROWTH OF Pt ( 001 ) THIN FILMS ONMgO ( 001 ) UNDER OXIDIZING CONDITIONS
Epitaxial Pt(001) thin films have been grown on MgO(001) substrates using dc magnetron sputtering with an Ar/0 2 mixture at 700'C. The width (FWHM) of the rocking curve of the Pt(002) peak is between 0.160 and 0.200, which is only 0.05' wider than that of the MgO (002) peak of the cleaved substrate. The film surface roughness is about 1 nm (rms) for a 240 nm thick Pt film. No grain structure co...
متن کاملRole of the Pinning Points in epitaxial Graphene Moiré Superstructures on the Pt(111) Surface
The intrinsic atomic mechanisms responsible for electronic doping of epitaxial graphene Moirés on transition metal surfaces is still an open issue. To better understand this process we have carried out a first-principles full characterization of the most representative Moiré superstructures observed on the Gr/Pt(111) system and confronted the results with atomically resolved scanning tunneling ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 105 21 شماره
صفحات -
تاریخ انتشار 2010