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dc.contributor.authorIbáñez, María
dc.contributor.authorZamani, Reza
dc.contributor.authorLi, Wenhua
dc.contributor.authorCadavid, Doris
dc.contributor.authorGorsse, Stéphane
dc.contributor.authorKatcho, Nebil A.
dc.contributor.authorShavel, Alexey
dc.contributor.authorLópez Martínez, Antonio Miguel
dc.contributor.authorMorante Lleonart, Joan Ramon
dc.contributor.authorArbiol, Jordi
dc.contributor.authorCabot, Andreu
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica
dc.date.accessioned2012-12-12T14:57:50Z
dc.date.created2012-11-14
dc.date.issued2012-11-14
dc.identifier.citationIbáñez, M. [et al.]. Crystallographic control at the nanoscale to enhance functionality:polytypic Cu2GeSe3 nanoparticles as thermoelectric materials. "Chemistry of materials", 14 Novembre 2012, vol. 24, núm. 23, p. 4615-4622.
dc.identifier.issn0897-4756
dc.identifier.urihttp://hdl.handle.net/2117/17122
dc.description.abstractThe potential to control the composition and crystal phase at the nanometer scale enable the production of nanocrystalline materials with enhanced functionalities and new applications. In the present work, we detail a novel colloidal synthesis route to prepare nanoparticles of the ternary semiconductor Cu2GeSe3 (CGSe) with nanometer-scale control over their crystal phases. We also demonstrate the structural effect on the thermoelectric properties of bottom-upprepared CGSe nanomaterials. By careful adjustment of the nucleation and growth temperatures, pure orthorhombic CGSe nanoparticles with cationic order or polytypic CGSe nanoparticles with disordered cation positions can be produced. In this second type of nanoparticle, a high density of twins can be created to periodically change the atomic plane stacking, forming a hexagonal wurtzite CGSe phase. The high yield of the synthetic routes reported here allows the production of single-phase and multiphase CGSe nanoparticles in the gram scale, which permits characterization of the thermoelectric properties of these materials. Reduced thermal conductivities and a related 2.5-fold increase of the thermoelectric figure of merit for multiphase nanomaterials compared to pure-phase CGSe are systematically obtained. These results are discussed in terms of the density and efficiency of phonon scattering centers in both types of materials.
dc.format.extent8 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Energies::Termoenergètica
dc.subjectÀrees temàtiques de la UPC::Enginyeria electrònica::Microelectrònica
dc.subjectÀrees temàtiques de la UPC::Física::Física de l'estat sòlid::Semiconductors
dc.subject.lcshNanocrystals--Electric properties
dc.subject.lcshThermoelectric materials--Research
dc.subject.lcshNanocomposites (Materials)--Research
dc.subject.lcshSphalerite
dc.titleCrystallographic control at the nanoscale to enhance functionality:polytypic Cu2GeSe3 nanoparticles as thermoelectric materials
dc.typeArticle
dc.subject.lemacNanocristalls semiconductors
dc.subject.lemacNanotecnologia
dc.subject.lemacMicroelectrònica
dc.subject.lemacTermoelectricitat
dc.subject.lemacsemiconductors
dc.contributor.groupUniversitat Politècnica de Catalunya. INSIDE - Innovació en Sistemes per al Disseny i la Formació a l'Enginyeria
dc.identifier.doi10.1021/cm303252q
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://pubs.acs.org/doi/abs/10.1021/cm303252q
dc.rights.accessRestricted access - publisher's policy
drac.iddocument11126826
dc.description.versionPostprint (published version)
dc.date.lift10000-01-01
upcommons.citation.authorIbáñez, M.; Zamani, R.; Li, W.; Cadavid, D.; Gorsse, S.; Katcho, N.; Shavel, A.; Lopez, A.; Morante, J.; Arbiol, J.; Cabot, A.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameChemistry of materials
upcommons.citation.volume24
upcommons.citation.number23
upcommons.citation.startingPage4615
upcommons.citation.endingPage4622


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