Synthesis and characterization of cyclotriphosphazenes containing silicon as single solid-state precursors for the formation of silicon/phosphorus nanostructured materials

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dc.contributor.author Díaz, Carlos
dc.contributor.author Valenzuela, María Luisa
dc.contributor.author Bravo, Daniel
dc.contributor.author Lavayen, Vladimir
dc.contributor.author O'Dwyer, Colm
dc.date.accessioned 2016-07-06T14:38:12Z
dc.date.available 2016-07-06T14:38:12Z
dc.date.issued 2008-11-01
dc.identifier.citation Diaz, C., Valenzuela, M. L., Bravo, D., Lavayen, V and O'Dwyer, C.(2008) 'Synthesis and characterization of cyclotriphosphazenes containing silicon as single solid-state precursors for the formation of silicon/phosphorus nanostructured materials', Inorganic Chemistry, 47(24), pp. 11561–11569. http://dx.doi.org/10.1021/ic8009805 en
dc.identifier.volume 47 en
dc.identifier.issued 24 en
dc.identifier.startpage 11561 en
dc.identifier.endpage 11569 en
dc.identifier.issn 0020-1669
dc.identifier.issn 1520-510X
dc.identifier.uri http://hdl.handle.net/10468/2830
dc.identifier.doi 10.1021/ic8009805
dc.description.abstract The synthesis and characterization of new organosilicon derivatives of N3P3Cl6, N3P3[NH(CH2)3Si(OEt)3]6 (1), N3P3[NH(CH2)3Si(OEt)3]3[NCH3(CH2)3CN]3 (2), and N3P3[NH(CH2)3Si(OEt)3]3[HOC6H4(CH2)CN]3 (3) are reported. Pyrolysis of 1, 2, and 3 in air and at several temperatures results in nanostructured materials whose composition and morphology depend on the temperature of pyrolysis and the substituents of the phosphazenes ring. The products stem from the reaction of SiO2 with P2O5, leading to either crystalline Si5(PO4)6O, SiP2O7 or an amorphous phase as the glass Si5(PO4)6O/3SiO2·2P2O5, depending on the temperature and nature of the trimer precursors. From 1 at 800 °C, core−shell microspheres of SiO2 coated with Si5(PO4)6O are obtained, while in other cases, mesoporous or dense structures are observed. Atomic force microscopy examination after deposition of the materials on monocrystalline silicon wafers evidences morphology strongly dependent on the precursors. Isolated islands of size ∼9 nm are observed from 1, whereas dense nanostructures with a mean height of 13 nm are formed from 3. Brunauer−Emmett−Teller measurements show mesoporous materials with low surface areas. The proposed growth mechanism involves the formation of cross-linking structures and of vacancies by carbonization of the organic matter, where the silicon compounds nucleate. Thus, for the first time, unique silicon nanostructured materials are obtained from cyclic phosphazenes containing silicon. en
dc.description.sponsorship Fondo Nacional de Desarrollo Científico y Tecnológico, Chile (FONDECYT project 1085011) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Chemical Society en
dc.rights © 2008 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/pdf/10.1021/ic8009805 en
dc.subject Phosphazene-organosilicon polymers en
dc.subject Structural characterization en
dc.subject Organometallic derivatives en
dc.subject Mesoporous silica en
dc.subject Nanoparticles en
dc.title Synthesis and characterization of cyclotriphosphazenes containing silicon as single solid-state precursors for the formation of silicon/phosphorus nanostructured materials en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Colm O'Dwyer, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: c.odwyer@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2012-11-29T17:52:38Z
dc.description.version Accepted Version en
dc.internal.rssid 162343119
dc.contributor.funder Fondo Nacional de Desarrollo Científico y Tecnológico en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Inorganic Chemistry en
dc.internal.copyrightchecked No. !!CORA!! Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress c.odwyer@ucc.ie en


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