Jane Elisa Guimarães, , , Rafael Nadas, , , Rayan Alves, , , Wenjin Zhang, , , Takahiko Endo, , , Kenji Watanabe, , , Takashi Taniguchi, , , Riichiro Saito, , , Yasumitsu Miyata, , , Bernardo R. A. Neves, , and , Ado Jorio*,
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Nano-Raman Spectroscopy Figure of Merit and Chemical Analysis of Contaminations in Single-Layer MoSe2
Contaminations in the formation of two-dimensional heterostructures can hinder or generate the 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 50–200 nm sized nanoprotuberances within a monolayer of MoSe2 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 the MoSe2 peaks ratio resulting from TERS field coherence. New spectral peaks are also identified, which are associated with the presence of nanoprotuberances and indicate contamination and oxidation with localized charge transfer between MoSe2 and contaminant species.
期刊介绍：
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.
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