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Keywords = WS2 colloidal nanocrystals

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11 pages, 2546 KB  
Article
An Insight into Chemistry and Structure of Colloidal 2D-WS2 Nanoflakes: Combined XPS and XRD Study
by Riccardo Scarfiello, Elisabetta Mazzotta, Davide Altamura, Concetta Nobile, Rosanna Mastria, Simona Rella, Cinzia Giannini, Pantaleo Davide Cozzoli, Aurora Rizzo and Cosimino Malitesta
Nanomaterials 2021, 11(8), 1969; https://doi.org/10.3390/nano11081969 - 30 Jul 2021
Cited by 43 | Viewed by 5260
Abstract
The surface and structural characterization techniques of three atom-thick bi-dimensional 2D-WS2 colloidal nanocrystals cross the limit of bulk investigation, offering the possibility of simultaneous phase identification, structural-to-morphological evaluation, and surface chemical description. In the present study, we report a rational understanding based [...] Read more.
The surface and structural characterization techniques of three atom-thick bi-dimensional 2D-WS2 colloidal nanocrystals cross the limit of bulk investigation, offering the possibility of simultaneous phase identification, structural-to-morphological evaluation, and surface chemical description. In the present study, we report a rational understanding based on X-ray photoelectron spectroscopy (XPS) and structural inspection of two kinds of dimensionally controllable 2D-WS2 colloidal nanoflakes (NFLs) generated with a surfactant assisted non-hydrolytic route. The qualitative and quantitative determination of 1T’ and 2H phases based on W 4f XPS signal components, together with the presence of two kinds of sulfur ions, S22− and S2−, based on S 2p signal and related to the formation of WS2 and WOxSy in a mixed oxygen-sulfur environment, are carefully reported and discussed for both nanocrystals breeds. The XPS results are used as an input for detailed X-ray Diffraction (XRD) analysis allowing for a clear discrimination of NFLs crystal habit, and an estimation of the exact number of atomic monolayers composing the 2D-WS2 nanocrystalline samples. Full article
(This article belongs to the Section Nanocomposite Materials)
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