Dynamics of Bulk vs. Nanoscale WS_2: Local Strain and Charging Effects

Abstract

We measured the infrared vibrational properties of bulk and nanoparticle WS${}_2$ in order to investigate the structure-property relations in these novel materials. In addition to the symmetry-breaking effects of local strain, nanoparticle curvature modifies the local charging environment of the bulk material. Performing a charge analysis on the \emph{xy}-polarized E${}_{1u}$ vibrational mode, we find an approximate 1.5:1 intralayer charge difference between the layered 2H material and inorganic fullerene-like (IF) nanoparticles. This effective charge difference may impact the solid-state lubrication properties of nanoscale metal dichalcogenides.

arXiv comment6 pages, 5 figures

Cited by in corpus (4)

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• Vibrational and dielectric properties of the bulk transition metal dichalcogenides
• Intrinsic electron spin relaxation due to the D'yakonov-Perel' mechanism in monolayer MoS${}_2$