Solid-state synthesis of embedded single-crystal metal oxide and phosphate nanoparticles and in situ crystallization

摘要: Abstract A new solid state organometallic route to embedded nanoparticle-containing inorganic materials is shown, through pyrolysis of metal-containing derivatives cyclotriphosphazenes. Pyrolysis in air and at 800 °C molecular precursors gives individual single-crystal nanoparticles SiP 2 O 7 , TiO P 4 7, WP SiO depending on the precursor used. High resolution transmission electron microscopy investigations reveal, most cases, perfect single crystals metal oxides first nanostructures negative thermal expansion phosphates with diameters range 2–6 nm for all products. While are by this method, reported time. In situ recrystallization formation nanocrystals was also observed due beam induced reactions during measurements nanoparticulate pyrolytic products . The possible mechanism much lower temperatures than their bulk counterparts both cases discussed. Degrees stabilization from affects nanocrystalline products: coalescing crystallization occurring amorphous host which form as a within solid. approach allows simple multimetallic, monometallic, metal-oxide phosphate an dielectric. method can be extended nearly any capable successful coordination allow nanoparticle layers features deposited or written surfaces application high mobility pyrophosphate lithium–ion cathode materials, catalysis nanocrystal dielectric layers.