Dynamics of Bulk vs. Nanoscale WS2: Local Strain and Charging Effects
R. D. Luttrell, S. Brown, J. Cao, J. L. Musfeldt, R. Rosentsveig, R. Tenne
Abstract
We measured the infrared vibrational properties of bulk and nanoparticle WS2 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 xy-polarized E1u 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.
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