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Title: Spectroscopic characterization of N = 9 armchair graphene nanoribbons

In this study, 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. To conclude, our results indicate the 9-AGNRs are a novel 1D semiconductor with a high potential in nanoelectronic applications.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5] ;  [5] ;  [6] ;  [7] ;  [8]
  1. University of Cologne (Germany). II. Institute of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Department of Chemistry
  3. St. Petersburg State University (Russia)
  4. University of Cologne (Germany). II. Institute of Physics; St. Petersburg State University (Russia); IFW‐Dresden (Germany)
  5. Elettra Sincrotrone Trieste (Italy)
  6. Univ. of California, Berkeley, CA (United States). Department of Chemistry
  7. Univ. of California, Berkeley, CA (United States). Department of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division; Kavli Energy Nanosciences Institute at the University of California Berkeley and Lawrence Berkeley National Laboratory, Berkeley, CA (United States)
  8. II. Institute of Physics, University of Cologne, Zülpicher Str. 77 50937 Cologne Germany
Publication Date:
Grant/Contract Number:
AC02-05CH11231; SC0010409
Type:
Accepted Manuscript
Journal Name:
Physica Status Solidi rrl
Additional Journal Information:
Journal Volume: 11; Journal Issue: 8; Related Information: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim; Journal ID: ISSN 1862-6254
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; angle-resolved photoelectron spectroscopy; graphene; nanoribbons; near edge X-ray absorption fine structure spectroscopy; Raman spectroscopy; X-ray photoelectron spectroscopy
OSTI Identifier:
1437964
Alternate Identifier(s):
OSTI ID: 1375533