Boron-Doped Graphene Nanoribbons: Electronic Structure and Raman Fingerprint

ACS Nano
Boris V SenkovskiyAlexander Grüneis

Abstract

We investigate the electronic and vibrational properties of bottom-up synthesized aligned armchair graphene nanoribbons of N = 7 carbon atoms width periodically doped by substitutional boron atoms (B-7AGNRs). Using angle-resolved photoemission spectroscopy and density functional theory calculations, we find that the dopant-derived valence and conduction band states are notably hybridized with electronic states of Au substrate and spread in energy. The interaction with the substrate leaves the bands with pure carbon character rather unperturbed. This results in an identical effective mass of ≈0.2 m0 for the next-highest valence band compared with pristine 7AGNRs. We probe the phonons of B-7AGNRs by ultrahigh-vacuum (UHV) Raman spectroscopy and reveal the existence of characteristic splitting and red shifts in Raman modes due to the presence of substitutional boron atoms. Comparing the Raman spectra for three visible lasers (red, green, and blue), we find that interaction with gold suppresses the Raman signal from B-7AGNRs and the energy of the green laser (2.33 eV) is closer to the resonant E22 transition. The hybridized electronic structure of the B-7AGNR-Au interface is expected to improve electrical characteristics of contact...Continue Reading

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Citations

Dec 13, 2019·Advanced Materials·Xiahong Zhou, Gui Yu
Sep 19, 2020·Advanced Materials·Zongping ChenKlaus Müllen
Dec 12, 2019·ACS Nano·Niels EhlenAlexander Grüneis
Dec 4, 2019·The Journal of Organic Chemistry·Yuuta YanoKenichiro Itami
Sep 15, 2021·Chemical Communications : Chem Comm·Shreenibasa SaKrishnan Venkatasubbaiah

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