Ultra-high vacuum processing and characterization of chemically functionalized graphene

Qing Hua Wang, Mark C. Hersam

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


The chemical functionalization of graphene in ultra-high vacuum (UHV) with monolayers of 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) has been characterized with scanning tunneling microscopy (STM). The molecules self-assemble into stable, well-ordered monolayers that are arranged in a herringbone phase with extended domains spanning hundreds of nanometers. At submonolayer coverage, PTCDA forms stable, isolated molecular islands. The molecular ordering is unperturbed by either defects in the epitaxial graphene or atomic steps in the underlying SiC surface. Scanning tunneling spectroscopy (STS) performed on the PTCDA monolayers reveals strong features in the electronic density of states that are distinct from the pristine graphene regions. The demonstration of robust, uniform organic functionalization of epitaxial graphene is an important step toward realizing graphene-based molecular electronic and sensing devices.

Original languageEnglish (US)
Title of host publicationGraphene, Ge/III-V, and Emerging Materials for Post-CMOS Applications 2
PublisherElectrochemical Society Inc.
Number of pages4
ISBN (Electronic)9781607681458
ISBN (Print)9781566777957
StatePublished - 2010
Externally publishedYes

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

ASJC Scopus subject areas

  • Engineering(all)


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