Substrate Hybridization and Rippling of Graphene Evidenced by Near-Edge X-ray Absorption Fine Structure Spectroscopy

Journal Article · Fri Jan 01 04:00:00 EST 2010 · The Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/jz100209h· OSTI ID:1020200

Lee, V; Park, C; Jaye, C; Fischer, D; Yu, Q; Wu, W; Pei, S; Smith, C; Lysaght, P; Banerjee, S

Interfacial interactions at graphene/metal and graphene/dielectric interfaces are likely to profoundly influence the electronic structure of graphene. We present here the first angle-resolved near-edge X-ray absorption fine structure (NEXAFS) spectroscopy study of single- and bilayered graphene grown by chemical vapor deposition on Cu and Ni substrates. The spectra indicate the presence of new electronic states in the conduction band derived from hybridization of the C-{pi} network with Cu and Ni d-orbitals. In conjunction with Raman data demonstrating charge transfer, the NEXAFS data illustrate that the uniquely accessible interfaces of two-dimensional graphene are significantly perturbed by surface coatings and the underlying substrate. NEXAFS data have also been acquired after transfer of graphene onto SiO{sub 2}/Si substrates and indicate that substantial surface corrugation and misalignment of graphene is induced during the transfer process. The rippling and corrugation of graphene, studied here by NEXAFS spectroscopy, is thought to deleteriously impact electrical transport in graphene.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1020200
• Report Number(s): BNL--96050-2011-JA
• Journal Information: The Journal of Physical Chemistry Letters, Journal Name: The Journal of Physical Chemistry Letters Journal Issue: 8 Vol. 1; ISSN 1948-7185
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
CHEMICAL VAPOR DEPOSITION
ELECTRONIC STRUCTURE
FINE STRUCTURE
HYBRIDIZATION
SPECTRA
SPECTROSCOPY
SUBSTRATES
SURFACE COATING
THIN FILMS
TRANSPORT
national synchrotron light source