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Aryl Functionalization as a Route to Band Gap Engineering in Single Layer Graphene Devices
- Source :
- Nano Letters. 11:4047-4051
- Publication Year :
- 2011
- Publisher :
- American Chemical Society (ACS), 2011.
-
Abstract
- Chemical functionalization is a promising route to band gap engineering of graphene. We chemically grafted nitrophenyl groups onto exfoliated single-layer graphene sheets in the form of substrate-supported or free-standing films. Our transport measurements demonstrate that nonsuspended functionalized graphene behaves as a granular metal, with variable range hopping transport and a mobility gap ∼0.1 eV at low temperature. For suspended graphene that allows functionalization on both surfaces, we demonstrate tuning of its electronic properties from a granular metal to a semiconductor in which transport occurs via thermal activation over a transport gap ∼80 meV from 4 to 300 K. This noninvasive and scalable functionalization technique paves the way for CMOS-compatible band gap engineering of graphene electronic devices.
- Subjects :
- FOS: Physical sciences
Bioengineering
Variable-range hopping
law.invention
Metal
chemistry.chemical_compound
law
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Thermal
Band-gap engineering
General Materials Science
Physics
Condensed Matter - Mesoscale and Nanoscale Physics
business.industry
Graphene
Mechanical Engineering
Aryl
General Chemistry
Condensed Matter Physics
Semiconductor
chemistry
visual_art
visual_art.visual_art_medium
Surface modification
Optoelectronics
business
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi.dedup.....e3206083b0ed3dd03b216cfec8df1d41