Tunable interfacial properties of epitaxial graphene on metal substrates
Abstract
We report on tuning interfacial properties of epitaxially-grown graphenes with different kinds of metal substrates based on scanning tunneling microscopy experiments and density functional theory calculations. Three kinds of metal substrates, Ni(111), Pt(111), and Ru(0001), show different interactions with the epitaxially grown graphene at the interfaces. The different interfacial interaction making graphene n-type and p-type doped, leads to the polarity change of the thermoelectric property of the graphene/metal systems. These findings may give further insights to the interfacial interactions in the graphene/metal systems and promote the use of graphene-based heterostructures in devices.
- Publication:
-
Applied Physics Letters
- Pub Date:
- February 2010
- DOI:
- Bibcode:
- 2010ApPhL..96e3109G
- Keywords:
-
- density functional theory;
- epitaxial layers;
- graphene;
- interface states;
- nickel;
- platinum;
- ruthenium;
- scanning tunnelling microscopy;
- semiconductor-metal boundaries;
- substrates;
- thermoelectricity;
- 73.40.Ns;
- 71.20.Tx;
- 71.15.Mb;
- 72.20.Pa;
- 73.50.Lw;
- 73.20.At;
- Metal-nonmetal contacts;
- Fullerenes and related materials;
- intercalation compounds;
- Density functional theory local density approximation gradient and other corrections;
- Thermoelectric and thermomagnetic effects;
- Thermoelectric effects;
- Surface states band structure electron density of states