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3 October 2022 Nano-Raman spectral imaging of localized vibrations in two-dimensional systems
Ado Jorio, Cassiano Rabelo, Rafael Nadas, Hudson Miranda, Thiago Vasconcelos, Bráulio S. Archanjo, Andreij C. Gadelha, Luiz Gustavo Cançado
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Proceedings Volume 12203, Enhanced Spectroscopies and Nanoimaging 2022; 1220302 (2022) https://doi.org/10.1117/12.2633265
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
Here we report graphene systems' nano-Raman hyperspectral imaging based on tip-enhanced Raman scattering (TERS). The vibrational and electronic structures are modulated within the graphene-related materials, leading to nano-scale changes in the behavior of electrons and phonons that can be used for spectral imaging. Furthermore, we utilize a He-focused ion beam to do nanolithography on graphene. We then show that the tiny features on graphene made by the He-focused ion beam can only be visualized under nanometer-scaled spectroscopy imaging. We have also imaged low-angle reconstructed twisted bilayer graphene, and our observations highlight the relevance of solitons and topological points for the structures' vibrational and electronic properties, relevant in the context of twistronics.
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Ado Jorio, Cassiano Rabelo, Rafael Nadas, Hudson Miranda, Thiago Vasconcelos, Bráulio S. Archanjo, Andreij C. Gadelha, and Luiz Gustavo Cançado "Nano-Raman spectral imaging of localized vibrations in two-dimensional systems", Proc. SPIE 12203, Enhanced Spectroscopies and Nanoimaging 2022, 1220302 (3 October 2022); https://doi.org/10.1117/12.2633265
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KEYWORDS
Graphene
Imaging spectroscopy
Imaging systems
Raman spectroscopy
Hyperspectral imaging
Near field optics
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