Observation of Magnetic Edge State and Dangling Bond State on Nanographene in Activated Carbon Fibers
arXiv:1106.4061 · doi:10.1103/PhysRevB.84.045421
Abstract
The electronic structure of nanographene in pristine and fluorinated activated carbon fibers (ACFs) have been investigated with near-edge x-ray absorption fine structure (NEXAFS) and compared with magnetic properties we reported on previously. In pristine ACFs in which magnetic properties are governed by non-bonding edge states of the π-electron, a pre-peak assigned to the edge state was observed below the conduction electron π* peak close to the Fermi level in NEXAFS. Via the fluorination of the ACFs, an extra peak, which was assigned to the σ-dangling bond state, was observed between the pre-peak of the edge state and the π* peak in the NEXAFS profile. The intensities of the extra peak correlate closely with the spin concentration created upon fluorination. The combination of the NEXAFS and magnetic measurement results confirms the coexistence of the magnetic edge states of π-electrons and dangling bond states of σ-electrons on fluorinated nanographene sheets.
4 figures, to appear in Phys. Rev. B
References in corpus (5)
- The electronic properties of graphene
- Magnetism in Graphene Induced by Single-Atom Defects
- Induced Magnetic Ordering by Proton Irradiation in Graphite
- Observation of zigzag and armchair edges of graphite using scanning tunneling microscopy and spectroscopy
- Scanning tunneling microscopy and spectroscopy of the electronic local density of states of graphite surfaces near monoatomic step edges