Synthesis of Tungsten Diselenide Nanoparticles by Chemical Vapor Condensation Method

Oleg V. Tolochko, Vasilyeva S. Ekaterina, Albert G. Nasibulin, Maxim Maximov, Anil Sachdev, Xincheng XIAO

Abstract


Crystalline tungsten diselenide (WSe2) nanoparticles have been synthesized by a gas phase reaction using tungsten hexacarbonyl and elemental selenium as precursors. The WSe2 nanoparticle morphology varies from the spherical shape to flake-like layered structures. Mean size in smaller dimension are less than 5 nm and the number of layers decreased linearly with decreasing of reaction time and concentration of carbonyl in the gas phase. The mean value of interlayer distance in <0001> direction is comparable with the microscopic values. The selenium-to-tungsten atomic ratios of 2.07, 2.19 and 2.19 were determined respectively, approach to the stoichiometric ratio of 2:1. Main impurities are oxygen and carbon and strongly interrelated with carbonyl concentration in the gas phase.

DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7356


Keywords


WSe2; nanoparticles; chemical vapor condensation; chemical synthesis; layered structures

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Print ISSN: 1392–1320
Online ISSN: 2029–7289