TY - JOUR
T1 - Optimized Substrates and Measurement Approaches for Raman Spectroscopy of Graphene Nanoribbons
AU - Overbeck, Jan
AU - Borin Barin, Gabriela
AU - Daniels, Colin
AU - Perrin, Mickael L.
AU - Liang, Liangbo
AU - Braun, Oliver
AU - Darawish, Rimah
AU - Burkhardt, Bryanna
AU - Dumslaff, Tim
AU - Wang, Xiao Ye
AU - Narita, Akimitsu
AU - Müllen, Klaus
AU - Meunier, Vincent
AU - Fasel, Roman
AU - Calame, Michel
AU - Ruffieux, Pascal
N1 - Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The on-surface synthesis of graphene nanoribbons (GNRs) allows for the fabrication of atomically precise narrow GNRs. Despite their exceptional properties which can be tuned by ribbon width and edge structure, significant challenges remain for GNR processing and characterization. Herein, Raman spectroscopy is used to characterize different types of GNRs on their growth substrate and track their quality upon substrate transfer. A Raman-optimized (RO) device substrate and an optimized mapping approach are presented that allow for the acquisition of high-resolution Raman spectra, achieving enhancement factors as high as 120 with respect to signals measured on standard SiO2/Si substrates. This approach is well suited to routinely monitor the geometry-dependent low-frequency modes of GNRs. In particular, the radial breathing-like mode (RBLM) and the shear-like mode (SLM) for 5-, 7-, and 9-atom-wide armchair GNRs (AGNRs) are tracked and their frequencies are compared with first-principles calculations.
AB - The on-surface synthesis of graphene nanoribbons (GNRs) allows for the fabrication of atomically precise narrow GNRs. Despite their exceptional properties which can be tuned by ribbon width and edge structure, significant challenges remain for GNR processing and characterization. Herein, Raman spectroscopy is used to characterize different types of GNRs on their growth substrate and track their quality upon substrate transfer. A Raman-optimized (RO) device substrate and an optimized mapping approach are presented that allow for the acquisition of high-resolution Raman spectra, achieving enhancement factors as high as 120 with respect to signals measured on standard SiO2/Si substrates. This approach is well suited to routinely monitor the geometry-dependent low-frequency modes of GNRs. In particular, the radial breathing-like mode (RBLM) and the shear-like mode (SLM) for 5-, 7-, and 9-atom-wide armchair GNRs (AGNRs) are tracked and their frequencies are compared with first-principles calculations.
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U2 - 10.1002/pssb.201900343
DO - 10.1002/pssb.201900343
M3 - Article
AN - SCOPUS:85074794244
SN - 0370-1972
VL - 256
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
IS - 12
M1 - 1900343
ER -