Single-crystal micro/nanostructures and thin films of lamellar molybdenum oxide by solid-state pyrolysis of organometallic derivatives of a cyclotriphosphazene |
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Authors: | Carlos Dí az |
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Affiliation: | a Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile b Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile c Department of Physics and Materials & Surface Science Institute, University of Limerick, Limerick, Ireland |
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Abstract: | The solid-state pyrolysis of organometallic derivatives of a cyclotriphosphazene is demonstrated to be a new, simple and versatile solid-state templating method for obtaining single-crystal micro- and nanocrystals of transition and valve metal oxides. The technique, when applied to Mo-containing organometallics N3P3[OC6H4CH2CN·Mo(CO)5]6 and N3P3[OC6H4CH2CN·Mo(CO)4 py]6, results in stand-alone and surface-deposited lamellar MoO3 single crystals, as determined by electron and atomic force microscopies and X-ray diffraction. The size and morphology of the resulting crystals can be tuned by the composition of the precursor. X-ray photoelectron and infrared spectroscopies indicate that the deposition of highly lamellar MoO3 directly on an oxidized (400 nm SiO2) surface or (100) single-crystal silicon surfaces yields a layered uniphasic single-crystal film formed by cluster diffusion on the surface during pyrolysis of the metal-carbonyl derivatives. For MoO3 in its layered form, this provides a new route to an important intercalation material for high energy density battery materials. |
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Keywords: | Nanostructures Metal oxides Organometallic synthesis Pyrolysis Battery materials Intercalation |
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