Single-crystalmicro/nanostructuresandthinfilmsoflamellarmolybdenum oxide bysolid-statepyrolysisoforganometallicderivativesofa cyclotriphosphazene

Abstract

The solid-statepyrolysisoforganometallicderivativesofacyclotriphosphazeneisdemonstratedtobea new, simpleandversatilesolid-statetemplatingmethodforobtainingsingle-crystalmicro-and nanocrystalsoftransitionandvalvemetaloxides.Thetechnique,whenappliedtoMo-containing organometallicsN3P3[OC6H4CH2CN Mo(CO)5]6 and N3P3[OC6H4CH2CN Mo(CO)4 py]6, resultsinstand- alone andsurface-depositedlamellarMoO3 single crystals,asdeterminedbyelectronandatomicforce microscopiesandX-raydiffraction.Thesizeandmorphologyoftheresultingcrystalscanbetunedby the compositionoftheprecursor.X-rayphotoelectronandinfraredspectroscopiesindicatethatthe depositionofhighlylamellarMoO3 directly onanoxidized(400nmSiO2) surfaceor(100)single-crystal silicon surfacesyieldsalayereduniphasicsingle-crystalfilmformedbyclusterdiffusiononthesurface during pyrolysisofthemetal-carbonylderivatives.ForMoO3 in itslayeredform,thisprovidesanew routetoanimportantintercalationmaterialforhighenergydensitybatterymaterials.