Ado Jorio de Vasconcelos is Professor at the Physics Department of the Federal University of Minas Gerais (UFMG), he is a member of the Brazilian Society of Physics, the Brazilian Academy of Sciences, the National Order of Scientific Merit, The World Academy of Sciences, and received the “membership award to the American Chemical Society” (2015-2018). Vasconcelos is one of the authors of the article “Nano-Raman spectral imaging of localized vibrations in two-dimensional systems”, published in Enhanced Spectroscopies and Nanoimaging, in 2022.

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.

Authors: Ado Jorio, Cassiano Rabelo, Rafael Nadas, Hudson Miranda, Thiago Vasconcelos, Bráulio S. Archanjo, Andreij C. Gadelha, Luiz Gustavo Cançado.

Read the article here.