1. Spectroscopic characterization of N = 9 armchair graphene nanoribbons
- Author
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Rebecca A. Durr, G. Di Santo, Alexander Grüneis, D. Yu. Usachov, Boris V. Senkovskiy, Felix R. Fischer, Danny Haberer, Niels Ehlen, Martin Hell, Alexander Fedorov, and Luca Petaccia
- Subjects
Materials science ,Phonon ,Graphene ,business.industry ,Binding energy ,Angle-resolved photoemission spectroscopy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Molecular physics ,0104 chemical sciences ,law.invention ,symbols.namesake ,Semiconductor ,X-ray photoelectron spectroscopy ,law ,symbols ,General Materials Science ,Atomic physics ,0210 nano-technology ,Raman spectroscopy ,business ,Graphene nanoribbons - 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.
- Published
- 2017
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