Multiwavelength Raman spectroscopy of ultranarrow nanoribbons made by solution-mediated bottom-up approach
Rizzo D, Prezzi D, Ruini A, Nagyte V, Keerthi A, Narita A, Beser U, Xu F, Mai Y, Feng X, Mullen K, Molinari E, Casiraghi C (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 100
Article Number: 045406
Journal Issue: 4
DOI: 10.1103/PhysRevB.100.045406
Abstract
Here we present a combined experimental and theoretical study of graphene nanoribbons (GNRs), where detailed multiwavelength Raman measurements are integrated by accurate ab initio simulations. Our study covers several ultranarrow GNRs, obtained by means of solution-based bottom-up synthetic approach, allowing to rationalize the effect of edge morphology, position and type of functional groups, as well as the length on the GNR Raman spectrum. We show that the low-energy region, especially in the presence of bulky functional groups, is populated by several modes, and a single radial breathinglike mode cannot be identified. In the Raman optical region, we find that, except for the fully brominated case, all GNRs functionalized at the edges with different side groups show a characteristic dispersion of the D peak (8-22 cm-1/eV). This has been attributed to the internal degrees of freedom of these functional groups, which act as dispersion-activating defects. The G peak shows small to negligible dispersion in most of the cases, with larger values only in the presence of poor control of the edge functionalization, exceeding the values reported for highly defective graphene. In conclusion, we have shown that the characteristic dispersion of the G and D peaks offers further insight into the GNR structure and functionalization, by making Raman spectroscopy an important tool for the characterization of GNRs.
Involved external institutions
University of Manchester
United Kingdom (GB)
Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research
Germany (DE)
Shanghai Jiao Tong University / 上海交通大学
China (CN)
Technische Universität Dresden
Germany (DE)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
United Kingdom (GB)
Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research
Germany (DE)
Shanghai Jiao Tong University / 上海交通大学
China (CN)
Technische Universität Dresden
Germany (DE)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
How to cite
APA:
Rizzo, D., Prezzi, D., Ruini, A., Nagyte, V., Keerthi, A., Narita, A.,... Casiraghi, C. (2019). Multiwavelength Raman spectroscopy of ultranarrow nanoribbons made by solution-mediated bottom-up approach. Physical Review B, 100(4). https://doi.org/10.1103/PhysRevB.100.045406
MLA:
Rizzo, Daniele, et al. "Multiwavelength Raman spectroscopy of ultranarrow nanoribbons made by solution-mediated bottom-up approach." Physical Review B 100.4 (2019).
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