EurOgels : A ferromagnetic semiconductor with a porous structure prepared via the assembly of hybrid nanorods

Trepka, Bastian; Stiegeler, Julian; Wimmer, Ilona; Fonin, Mikhail; Polarz, Sebastian

EurOgels : A ferromagnetic semiconductor with a porous structure prepared via the assembly of hybrid nanorods

Dateien

Trepka_-2-11k7014jc5pm57.pdfGröße: 2.05 MBDownloads: 338

Datum

2018

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie
Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Nanoscale. 2018, 10(41), pp. 19272-19276. ISSN 2040-3364. eISSN 2040-3372. Available under: doi: 10.1039/c8nr06536e

Zusammenfassung

EuO is unique, because it belongs to the few solids combining semiconducting properties (E_gap = 1.1 eV) with native ferromagnetism. For future applications of EuO, e.g. as spin-filters or for sensors, one has to learn how defined nanostructures can be prepared. Unlike other ceramic oxides, there are no established soft-chemistry routes (e.g. sol-gel) towards EuO nanomaterials e.g. porous materials. This is due to the labile nature of the oxidation state Eu(+ii). We present a particle-based method leading to a EuO aerogel. Instead of making the target material directly, we use nanoparticles of an organic-inorganic hybrid phase (Eu₂O₃-benzoate) and assemble those into an aerogel, followed by the transformation into phase-pure EuO. It is shown that organic aldehydes act as capping agents for controlling the morphogenesis of the hybrid particles. Depending on the steric demand of the aldehyde, one obtains plate-like particles or nanorods with increasing aspect ratio. The particles form a gel, when the aspect ratio is increased to >20. After supercritical drying, one receives a nanorod-based aerogel. Treatment of the latter with Eu-vapor leads to reduction of the Eu₂O₃ domains to EuO while retaining the aerogel structure. Proof of ferromagnetism in the resulting EuO aerogel was delivered by SQUID measurements.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

TREPKA, Bastian, Julian STIEGELER, Ilona WIMMER, Mikhail FONIN, Sebastian POLARZ, 2018. EurOgels : A ferromagnetic semiconductor with a porous structure prepared via the assembly of hybrid nanorods. In: Nanoscale. 2018, 10(41), pp. 19272-19276. ISSN 2040-3364. eISSN 2040-3372. Available under: doi: 10.1039/c8nr06536e

BibTex

@article{Trepka2018-10-25EurOg-43556,
  year={2018},
  doi={10.1039/c8nr06536e},
  title={EurOgels : A ferromagnetic semiconductor with a porous structure prepared via the assembly of hybrid nanorods},
  number={41},
  volume={10},
  issn={2040-3364},
  journal={Nanoscale},
  pages={19272--19276},
  author={Trepka, Bastian and Stiegeler, Julian and Wimmer, Ilona and Fonin, Mikhail and Polarz, Sebastian}
}

RDF

<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/43556">
    <dc:creator>Wimmer, Ilona</dc:creator>
    <dc:contributor>Wimmer, Ilona</dc:contributor>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-10-17T07:36:10Z</dcterms:available>
    <dc:creator>Polarz, Sebastian</dc:creator>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/43556/1/Trepka_-2-11k7014jc5pm57.pdf"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <dcterms:title>EurOgels : A ferromagnetic semiconductor with a porous structure prepared via the assembly of hybrid nanorods</dcterms:title>
    <dc:contributor>Trepka, Bastian</dc:contributor>
    <dc:contributor>Polarz, Sebastian</dc:contributor>
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dc:rights>terms-of-use</dc:rights>
    <dc:creator>Fonin, Mikhail</dc:creator>
    <dcterms:abstract xml:lang="eng">EuO is unique, because it belongs to the few solids combining semiconducting properties (E&lt;sub&gt;gap&lt;/sub&gt; = 1.1 eV) with native ferromagnetism. For future applications of EuO, e.g. as spin-filters or for sensors, one has to learn how defined nanostructures can be prepared. Unlike other ceramic oxides, there are no established soft-chemistry routes (e.g. sol-gel) towards EuO nanomaterials e.g. porous materials. This is due to the labile nature of the oxidation state Eu(+ii). We present a particle-based method leading to a EuO aerogel. Instead of making the target material directly, we use nanoparticles of an organic-inorganic hybrid phase (Eu&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-benzoate) and assemble those into an aerogel, followed by the transformation into phase-pure EuO. It is shown that organic aldehydes act as capping agents for controlling the morphogenesis of the hybrid particles. Depending on the steric demand of the aldehyde, one obtains plate-like particles or nanorods with increasing aspect ratio. The particles form a gel, when the aspect ratio is increased to &gt;20. After supercritical drying, one receives a nanorod-based aerogel. Treatment of the latter with Eu-vapor leads to reduction of the Eu&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; domains to EuO while retaining the aerogel structure. Proof of ferromagnetism in the resulting EuO aerogel was delivered by SQUID measurements.</dcterms:abstract>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-10-17T07:36:10Z</dc:date>
    <dc:contributor>Stiegeler, Julian</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/41"/>
    <dc:creator>Trepka, Bastian</dc:creator>
    <dc:language>eng</dc:language>
    <dcterms:issued>2018-10-25</dcterms:issued>
    <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/43556"/>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/43556/1/Trepka_-2-11k7014jc5pm57.pdf"/>
    <dc:creator>Stiegeler, Julian</dc:creator>
    <dc:contributor>Fonin, Mikhail</dc:contributor>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Ja

Begutachtet

Ja