Synthesis of Tungsten Diselenide Nanoparticles by Chemical Vapor Condensation Method

  • Oleg V. Tolochko Saint Petersburg State Polytechnical University
  • Vasilyeva S. Ekaterina Saint Petersburg State Polytechnic University
  • Albert G. Nasibulin
  • Maxim Maximov
  • Anil Sachdev
  • Xincheng XIAO
Keywords: WSe2, nanoparticles, chemical vapor condensation, chemical synthesis, layered structures

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

Author Biographies

Oleg V. Tolochko, Saint Petersburg State Polytechnical University
Material Science Dept.
Vasilyeva S. Ekaterina, Saint Petersburg State Polytechnic University
Materials Science Deparment
Published
2015-07-27
Section
ELECTRONIC AND OPTICAL MATERIALS