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- W4296041462 abstract "Abstract Nanoscale defects in two-dimensional (2D) transition metal dichalcogenides (TMDs) alter their intrinsic optical and electronic properties, and such defects require investigation. Atomic-resolution techniques such as transmission electron microscopy detect nanoscale defects accurately but are limited in terms of clarifying precise chemical and optical characteristics. In this study, we investigated nanoscale heterogeneous defects in a single-crystalline hexagonal WS 2 monolayer using tip-enhanced Raman spectroscopy (TERS). We observed the Raman properties of heterogeneous defects, which are indicated by the shifted A 1 ′(Γ) modes appearing on the W- and S-edge domains, respectively, with defect-induced Raman (D) mode. In the edge region, various Raman features occur with nanoscale defects. In addition, the TERS signals from single-crystalline WS 2 indicate the existence of two majority defects in each domain, which imply S- and W-dominated vacancies. Quantum mechanical computations were performed for each majority defect and demonstrated the defect-induced variation in the vibrational phonon modes. TERS imaging promises to be a powerful technique for determining assorted nanoscale heterogeneous defects as well as for investigating the properties of other nanomaterials." @default.
- W4296041462 created "2022-09-17" @default.
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- W4296041462 date "2022-09-16" @default.
- W4296041462 modified "2023-10-18" @default.
- W4296041462 title "Investigating heterogeneous defects in single-crystalline WS2 via tip-enhanced Raman spectroscopy" @default.
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- W4296041462 doi "https://doi.org/10.1038/s41699-022-00334-4" @default.
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