Nano-Raman Spectroscopy Figure of Merit and Chemical Analysis of Contaminations in Single-Layer MoSe<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40931919.
- Also identified by DOI 10.1021/acsnano.5c08036 and PMC identifier 12530041.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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 MoSe<sub>2</sub> 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 MoSe<sub>2</sub> 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 MoSe<sub>2</sub> and contaminant species.