Phonons in 1-D Graphene Nanoribbons Probed with Raman Spectroscopy : Unraveling Fundamental Properties in 9-atom-wide Graphene Nanoribbons

Abstract: This report employs advanced Raman spectroscopy techniques to investigate the fundamental properties of 9-AGNRs comprehensively. It is divided into two main sections addressing distinct aspects of 9-AGNR behavior. In the first section, Polarization Raman spectroscopy (PRS) probes phonon mode symmetries in 9-AGNRs. Our analysis reveals deviations from predicted symmetries, suggesting the presence of lattice defects. We also investigate specific phonon modes (G, D, and RBLM), providing insights into lattice integrity. The second section employs temperature-dependent Raman spectroscopy to explore the thermal properties of 9-AGNRs. This dynamic analysis quantifies vibrational mode responsiveness to temperature variations using the Grüneisen parameter (χ). Comparisons across various carbon-based materials uncover distinct sensitivities and stabilities. This research advances our understanding of 9-AGNR properties, with implications for nanomaterial science and potential applications.