Structural transformation of tungsten oxide nanourchins into IF–WS2nanoparticles: an aberration corrected STEM study

Abstract

IF–WS₂ nanoparticles synthesized starting from tungsten oxide nanourchins have been investigated by using aberration corrected scanning transmission electron microscopy (C_s-STEM). The synthesis process produced IF–WS₂ nanoparticles of two different and well differentiated ranges of size. High resolution HAADF–STEM images and their comparison with simulated STEM micrographs reveal the predominance of stacking of the type 1T close to the border of the structure; the observation of this kind of stacking, observed previously in IF–MoS₂ but never reported before in the case of the IF–WS₂ nanostructures, adds a new dimension to the existing understanding of structure and stacking in the case of the nanostructures of transition metal chalcogenides.