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

Abstract

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
Title of host publicationECS Transactions
Pages95-98
Number of pages4
Volume28
Edition5
DOIs
Publication statusPublished - 2010
Event2nd International Symposium on Graphene, Ge/III-V and Emerging Materials for Post-CMOS Applications - 217th ECS Meeting - Vancouver, BC, Canada
Duration: Apr 26 2010Apr 29 2010

Other

Other2nd International Symposium on Graphene, Ge/III-V and Emerging Materials for Post-CMOS Applications - 217th ECS Meeting
CountryCanada
CityVancouver, BC
Period4/26/104/29/10

Fingerprint

Ultrahigh vacuum
Graphene
Processing
Monolayers
Molecular electronics
Electronic density of states
Scanning tunneling microscopy
Demonstrations
Spectroscopy
Scanning
Defects
Molecules

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Ultra-high vacuum processing and characterization of chemically functionalized graphene. / Wang, Qing Hua; Hersam, Mark C.

ECS Transactions. Vol. 28 5. ed. 2010. p. 95-98.

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

Wang, QH & Hersam, MC 2010, Ultra-high vacuum processing and characterization of chemically functionalized graphene. in ECS Transactions. 5 edn, vol. 28, pp. 95-98, 2nd International Symposium on Graphene, Ge/III-V and Emerging Materials for Post-CMOS Applications - 217th ECS Meeting, Vancouver, BC, Canada, 4/26/10. https://doi.org/10.1149/1.3367940
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