Substitutional doping of Ag into epitaxial graphene on 6H-SiC substrates during thermal decomposition

Substitutional doping of Ag into epitaxial graphene on 6H-SiC substrates during thermal... Controllable and damage-free doping of graphene is challenging because of the ultra-thin nature of graphene. In this work, epitaxial graphene prepared by thermal decomposition of 6H-SiC is doped with Ag substitutionally by annealing in a silver atmosphere. Scanning tunneling microscopy (STM) reveals that the Ag atoms are preferentially embedded in the bilayer regions substituting for C atoms at the α sites in the bottom lattice with negligible distortion, and first-principles calculation reveals a thermodynamically stable configuration. Essentially, the Ag atoms penetrate the edges or defects in the top graphene into the buffer layer and participate in crystallization of the second graphene layer during annealing. In this way, Ag atoms are introduced into the graphene lattice substitutionally via covalent bonding with carbon atoms. In addition, hybridization of the C 2p and Ag 4d orbitals results in the asymmetrical distributions of spin-up and spin-down channels and a magnetic moment of 1.06 μB emerges for each substitutional Ag. This simple doping approach can be utilized to tune the magnetic properties of graphene. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Carbon Elsevier

Substitutional doping of Ag into epitaxial graphene on 6H-SiC substrates during thermal decomposition

Loading next page...
 
/lp/elsevier/substitutional-doping-of-ag-into-epitaxial-graphene-on-6h-sic-wZtKhbaWab
Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0008-6223
D.O.I.
10.1016/j.carbon.2016.04.007
Publisher site
See Article on Publisher Site

Abstract

Controllable and damage-free doping of graphene is challenging because of the ultra-thin nature of graphene. In this work, epitaxial graphene prepared by thermal decomposition of 6H-SiC is doped with Ag substitutionally by annealing in a silver atmosphere. Scanning tunneling microscopy (STM) reveals that the Ag atoms are preferentially embedded in the bilayer regions substituting for C atoms at the α sites in the bottom lattice with negligible distortion, and first-principles calculation reveals a thermodynamically stable configuration. Essentially, the Ag atoms penetrate the edges or defects in the top graphene into the buffer layer and participate in crystallization of the second graphene layer during annealing. In this way, Ag atoms are introduced into the graphene lattice substitutionally via covalent bonding with carbon atoms. In addition, hybridization of the C 2p and Ag 4d orbitals results in the asymmetrical distributions of spin-up and spin-down channels and a magnetic moment of 1.06 μB emerges for each substitutional Ag. This simple doping approach can be utilized to tune the magnetic properties of graphene.

Journal

CarbonElsevier

Published: Aug 1, 2016

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off