Nano-Raman Spectroscopy Analysis of Nanoprotuberances in MoSe2
Jane Elisa Guimarães, Rafael Nadas, Rayan Alves, Wenjin Zhang, Takahiko Endo, Kenji Watanabe, Takashi Taniguchi, Riichiro Saito, Yasumitsu Miyata, Bernardo R. A. Neves, Ado Jorio
Published: 2025/5/25
Abstract
Contaminations in the formation of two-dimensional heterostructures can hinder or generate desired properties. Recent advancements have highlighted the potential of tip-enhanced Raman spectroscopy (TERS) for studying materials in the 2D semiconductor class. In this work, we investigate the influence of 50-200nm sized nanoprotuberances within a monolayer of MoSe$_2$ deposited on hBN using nano-Raman spectroscopy, establishing correlations between the presence of localized contaminations and the observed hyperspectral variations. A figure of merit is established for the identification of surface impurities, based on MoSe$_2$ peaks ratio. Notably, new spectral peaks were identified, which are associated with the presence of nanoprotuberances and may indicate contamination and oxidation.