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Title: | Epitaxial growth of tungsten nanoparticles on alumina and spinel surfaces |
Authors: | Rodríguez Suárez, Teresa CSIC; Díaz, Luis A. CSIC ORCID; López-Esteban, Sonia; Pecharromán, Carlos CSIC ORCID ; Esteban-Cubillo, A. CSIC; Torrecillas, Ramón CSIC ORCID CVN; Moya, J. S. CSIC | Keywords: | Tungsten nanoparticles Epitaxial growth Nanoparticle coating Ceramic grains surface Alumina Spinel |
Issue Date: | 21-Apr-2008 | Publisher: | Institute of Physics Publishing | Citation: | Nanotechnology 19(21): 215605 (2008) | Abstract: | Isolated tungsten nanoparticles (α-W and β-W phase) were synthesized and epitaxially grown on alumina and spinel particle surfaces with an average tungsten size of ≤20 nm for a low tungsten content (of ≤1.5 vol%). Using tungsten (VI) ethoxide alcoholic solutions, tungsten trioxide hydrated precursors were attached to a ceramic grains surface as a nanoparticle coating. High-resolution transmission electron microscopy (HRTEM) micrographs showed epitaxial interfaces between alumina, spinel and metallic tungsten. This epitaxial growth is assumed to be due to the effect of water vapour on the sublimation of ortho-tungstic acid during the reduction process in a hydrogen atmosphere. The planes involved in the epitaxy were found to be (220)Al2O3||(121)W and (311)MgAl2O4||(110)W. | Publisher version (URL): | http://dx.doi.org/10.1088/0957-4484/19/21/215605 | URI: | http://hdl.handle.net/10261/12526 | DOI: | 10.1088/0957-4484/19/21/215605 | ISSN: | 0957-4484 |
Appears in Collections: | (ICMM) Artículos (CINN) Artículos |
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