Results
Title

Spectroscopic characterization of N = 9 armchair graphene nanoribbons.

Authors

Senkovskiy, B. V.; Haberer, D.; Usachov, D. Yu.; Fedorov, A. V.; Ehlen, N.; Hell, M.; Petaccia, L.; Di Santo, G.; Durr, R. A.; Fischer, F. R.; Grüneis, A.

Abstract

We investigate the N = 9 atoms wide armchair-type graphene nanoribbons (9-AGNRs) by performing a comprehensive spectroscopic and microscopic characterization of this novel material. In particular, we use X-ray photoelectron, near edge X-ray absorption fine structure, scanning tunneling, polarized Raman and angle-resolved photoemission (ARPES) spectroscopies. The ARPES measurements are aided by calculations of the photoemission matrix elements which yield the position in k space having the strongest photoemission cross section. Comparison with well-studied narrow N = 7 AGNRs shows that the effective electron mass in 9-AGNRs is reduced by two times and the valence band maximum is shifted to lower binding energy by ∼0.6 eV. In polarized Raman measurements of the aligned 9-AGNR, we reveal anisotropic signal depending upon the phonon symmetry. Our results indicate the 9-AGNRs are a novel 1D semiconductor with a high potential in nanoelectronic applications.

Subjects

GRAPHENE; CARBON nanotubes; X-ray photoelectron spectroscopy; BINDING energy; PHOTOEMISSION

Publication

Physica Status Solidi - Rapid Research Letters, 2017, Vol 11, Issue 8, pn/a

ISSN

1862-6254

Publication type

Academic Journal

DOI

10.1002/pssr.201700157