Journal
ACS NANO
Volume 4, Issue 3, Pages 1345-1350Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn9019064
Keywords
graphene nanoribbon; half-metal; ferroelectric polymer; poly(vinylidene fluoride)
Categories
Funding
- Korea Government MEST (Center for Nanotubes and Nanostructured Composites) [KRF-2006341-C000015]
- KIST [21121040]
- NRF
- MEST [R012007-000-10654-0]
- Quantum Metamaterials Research Center [R11-2008-053-01002-0]
- National Research Foundation of Korea [CG031501, 2008-0062236, 2007-0052713, 2006-0093853] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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On the basis of first-principles computational approaches, we present a new method to drive zigzag graphene nanoribons (ZGNRs) into the half-metallic state using a ferroelectric material, poly(vinylidene fluoride) (PVDF). Owing to strong dipole moments of PVDFs, the ground state of the ZGNR becomes half-metallic when a critical coverage of PVDFs is achieved on the ZGNR. Since ferroelectric polymers are physisorbed, the direction of the dipole field in PVDFs can be rotated by relatively small external electric fields, and the switching between half-metallic and insulating states may be achieved. Our results suggest that, without excessively large external gate electric fields, half-metallic states of ZGNRs are realizable through the deposition of ferroelectric polymers and their electronic and magnetic properties are controllable via noninvasive mutual interactions.
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