Polysiloxane- derived ceramics containing nanowires with catalytically active tips

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dc.contributor.authorAdam, Michael
dc.contributor.authorVakıfahmetoğlu, Cekdar
dc.contributor.authorColombo, Paolo
dc.contributor.authorWilhelm, Michaela
dc.contributor.authorGrathwohl, Georg
dc.date.accessioned2021-05-15T12:40:47Z
dc.date.available2021-05-15T12:40:47Z
dc.date.issued2014
dc.departmentMühendislik ve Doğa Bilimleri Fakültesi, Makine Mühendisliği Bölümüen_US
dc.descriptionVakifahmetoglu, Cekdar/0000-0003-1222-4362; Wilhelm, Michaela/0000-0001-8651-1546
dc.description.abstractBy direct foaming of a Pt-containing polysiloxane precursor, macroporous ceramics were generated by pyrolysis at 1400 degrees C under nitrogen or argon. The growth of nanowires was induced via a vapor-liquid-solid mechanism in which the Pt particles acted as deposition site for the decomposition gases released upon pyrolyzing the preceramic polymer. SEM, HR-SEM, TEM/EDX, and XRD investigations revealed that pyrolysis under argon atmosphere leads to short SiC nanowires of only a few micrometers length and under nitrogen atmosphere Si3N4 nanowires evolved, with length of several 10m. In both cases the tips of the nanowires mainly consisted of PtSi. In contrast to samples pyrolyzed at 600 degrees C, the components after higher temperature pyrolysis showed moderate-specific surface areas of 55-67m(2)/g. In CO oxidation experiments, a good catalytic activity was found for the Pt silicide particles, suggesting that despite their relatively large size, their location at the tips of the nanowires affords them good reactivity.en_US
dc.description.sponsorshipGerman Research Foundation (DFG) within the DFGGerman Research Foundation (DFG) [GR 953/21-2]; Research Training Group GRKGerman Research Foundation (DFG) [1375]en_US
dc.description.sponsorshipThis work was supported by the German Research Foundation (DFG) within the DFG project GR 953/21-2 and the Research Training Group GRK 1375. We thank Petra Witte (Historical Geology - Paleontology, University of Bremen) for HR-SEM investigations, and Kristian Frank, Marco Schowalter, and Prof. Andreas Rosenauer (Institute of Solid State Physics, University of Bremen) for TEM and TEM/EDX investigations. Dr Johannes Birkenstock (Central Laboratory for Crystallography and Applied Materials, University of Bremen) is also gratefully acknowledged for performing the XRD measurements.en_US
dc.identifier.doi10.1111/jace.12708
dc.identifier.endpage966en_US
dc.identifier.issn0002-7820
dc.identifier.issn1551-2916
dc.identifier.issue3en_US
dc.identifier.scopus2-s2.0-84897645516
dc.identifier.scopusqualityQ1
dc.identifier.startpage959en_US
dc.identifier.urihttps://doi.org/10.1111/jace.12708
dc.identifier.urihttps://hdl.handle.net/20.500.12939/679
dc.identifier.volume97en_US
dc.identifier.wosWOS:000332195700045
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorVakıfahmetoğlu, Cekdar
dc.language.isoen
dc.publisherWiley-Blackwellen_US
dc.relation.ispartofJournal of the American Ceramic Society
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectActive Tipsen_US
dc.titlePolysiloxane- derived ceramics containing nanowires with catalytically active tips
dc.typeArticle

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