Unexpected Structures for Intercalation of Sodium in Epitaxial Graphene-SiC Interfaces

Description:

In this paper, the authors show using scanning tunneling microscopy, spectroscopy, and ab initio calculations that several intercalation structures exist for Na in epitaxial graphene on SiC(0001). Intercalation takes place at room temperature and Na electron-dopes the graphene. It intercalates in-between single-layer graphene and the carbon-rich interfacial layer. It also penetrates beneath the interfacial layer and decouples it to form a second graphene layer. This decoupling is accelerated by annealing and is verified by direct Na deposition onto the interface layer. The authors' observations show that intercalation in graphene is fundamentally different than in graphite and is a versatile means of electronic control.

Creator(s):
Creation Date: February 2012
Partner(s):
UNT College of Arts and Sciences
Collection(s):
UNT Scholarly Works
Usage:
Total Uses: 62
Past 30 days: 10
Yesterday: 0
Creator (Author):
Sandin, Andreas

North Carolina State University

Creator (Author):
Jayasekera, Thushari

Southern Illinois University-Carbondale

Creator (Author):
Rowe, J. E.

North Carolina State University

Creator (Author):
Kim, Ki Wook

North Carolina State University

Creator (Author):
Buongiorno Nardelli, Marco

University of North Texas; North Carolina State University; Oak Ridge National Laboratory

Creator (Author):
Dougherty, Daniel B.

North Carolina State University

Date(s):
  • Creation: February 2012
Description:

In this paper, the authors show using scanning tunneling microscopy, spectroscopy, and ab initio calculations that several intercalation structures exist for Na in epitaxial graphene on SiC(0001). Intercalation takes place at room temperature and Na electron-dopes the graphene. It intercalates in-between single-layer graphene and the carbon-rich interfacial layer. It also penetrates beneath the interfacial layer and decouples it to form a second graphene layer. This decoupling is accelerated by annealing and is verified by direct Na deposition onto the interface layer. The authors' observations show that intercalation in graphene is fundamentally different than in graphite and is a versatile means of electronic control.

Degree:
Department: Physics
Department: Chemistry
Note:

Copyright 2012 American Physical Society. APS March Meeting 2012, February 27-March 2, 2012, abstract #W12.004.

Physical Description:

16 p.

Language(s):
Subject(s):
Keyword(s): graphene | scanning tunneling microscopy | electronic materials | chemical doping
Source: American Physical Society (APS) March Meeting, 2012, Boston, Massachusetts, United States
Contributor(s):
Partner:
UNT College of Arts and Sciences
Collection:
UNT Scholarly Works
Identifier:
  • ARK: ark:/67531/metadc139464
Resource Type: Paper
Format: Text
Rights:
Access: Public