Solid-state chemistry route for supported tungsten and tungsten carbide nanoparticles

• Published in: Journal of solid state chemistry Vol. 194; pp. 23 - 31
• Main Authors: Hugot, N., Desforges, A., Fontana, S., Marêché, J.F., Hérold, C., Albiniak, A., Furdin, G.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.10.2012; Elsevier
• Subjects: Applied sciences; CARBON; Carburizing; Chemical synthesis methods; Cross-disciplinary physics: materials science; rheology; DEPOSITION; Electron microscopy; Electronics; Evolution; Exact sciences and technology; Gas solid reactions; HYDROGEN; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Materials science; Methods of nanofabrication; Nanoparticles; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; Optimization; Optoelectronic devices; PARTICLES; Physics; Precursors; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; SOLIDS; Transmission; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTEN; Tungsten carbide; TUNGSTEN CARBIDES; TUNGSTEN CHLORIDES; Vapor deposition; X-RAY DIFFRACTION; X-ray diffraction; Tungsten carbide; Vapor deposition; Gas solid reactions; Electron microscopy; Transmission; Gas solid reaction; Light emitting diodes; XRD; Carbon; Precursor; Optimization; Nanoparticles; Solid state; Transmission electron microscopy; Vapor phase; Solid state reaction; Diffusion; Nanostructured materials; Nanomaterial synthesis; Heterogeneous reaction
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2012.07.027

Nanoparticles of tungsten and tungsten carbide have been prepared using solid-state chemistry methods. After the vapor phase impregnation of a tungsten hexachloride precursor on a carbon support, a temperature-programmed reduction/carburization was performed. Several parameters were investigated and the evolution of obtained samples was followed by XRD and TEM. The optimization of the reaction parameters led to the preparation of W, W2C and WC particles well dispersed on the support. WC phase however could not be obtained alone with less than 10nm mean size. This could be explained by the carburization mechanism and the carbon diffusion on the support. Bright field picture of carbon-supported WC nanoparticles dispersed on the surface of the sample 1223K in 10% CH4/90% H2. [Display omitted] ► We aimed at the preparation of supported nanoparticulate tungsten derivatives. ► Several parameters were investigated. ► The evolution of obtained samples was followed by XRD and TEM. ► The optimal preparation led to W, W2C and WC particles dispersed on the support.