Sonication-assisted liquid phase exfoliation of two-dimensional CrTe_3 under inert conditions
arxiv(2024)
摘要
Liquid phase exfoliation (LPE) has been used for the successful fabrication
of nanosheets from a large number of van der Waals materials. While this allows
to study fundamental changes of material properties' associated with reduced
dimensions, it also changes the chemistry of many materials due to a
significant increase of the effective surface area, often accompanied with
enhanced reactivity and accelerated oxidation. To prevent material
decomposition, LPE and processing in inert atmosphere have been developed,
which enables the preparation of pristine nanomaterials, and to systematically
study compositional changes over time for different storage conditions. Here,
we demonstrate the inert exfoliation of the oxidation-sensitive van der Waals
crystal, CrTe_3. The pristine nanomaterial was purified and size-selected by
centrifugation, nanosheet dimensions in the fractions quantified by atomic
force microscopy and studied by Raman, X-ray photoelectron spectroscopy (XPS),
energy-dispersive X-ray spectroscopy (EDX) and photo spectroscopic
measurements. We find a dependence of the relative intensities of the CrTe_3
Raman modes on the propagation direction of the incident light, which prevents
a correlation of the Raman spectral profile to the nanosheet dimensions. XPS
and EDX reveal that the contribution of surface oxides to the spectra is
reduced after exfoliation compared to the bulk material. Further, the
decomposition mechanism of the nanosheets was studied by time-dependent
extinction measurements after water titration experiments to initially dry
solvents, which suggest that water plays a significant role in the material
decomposition.
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