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Si and Ge allotrope heterostructured nanowires: experimental evaluation of the thermal conductivity reduction

hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorBEN AMOR, Aymen
hal.structure.identifierCentre de Nanosciences et Nanotechnologies [C2N (UMR_9001)]
dc.contributor.authorDJOMANI, Doriane
hal.structure.identifierCentre de Nanosciences et Nanotechnologies [C2N (UMR_9001)]
dc.contributor.authorFAKHFAKH, Mariam
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorDILHAIRE, Stefan
hal.structure.identifierCentre de Nanosciences et Nanotechnologies [C2N (UMR_9001)]
dc.contributor.authorVINCENT, Laetitia
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorGRAUBY, Stéphane
dc.date.issued2019-07-01
dc.identifier.issn0957-4484
dc.description.abstractEnWe have studied the thermal conductivity of Ge and Si allotrope heterostructured nanowires (NWs) synthesized by phase transformation. The NWs are composed of successive hexagonal 2H and cubic diamond 3C crystal phases along the 〈111〉 axis. Using 3ω-scanning thermal microscopy on NWs embedded in a silica matrix, we present the first experimental evidence of thermal conductivity reduction in such allotrope 2H/3C heterostructured NWs. In Ge heterostructured 2H/3C NWs, similarly to homogeneous 3C NWs, we show a thermal conductivity reduction when the NW diameter decreases. In addition, in Si and Ge NWs, we observe a reduced thermal conductivity due to the heterostructuration 2H/3C. We evidence that the temperature of phase transformation, which influences the size and the number of 2H domains, can constitute an efficient parameter to tune the thermal conductivity.
dc.description.sponsorshipPropriétés de la phase hexagonale 2H du Ge et Si - ANR-17-CE30-0014
dc.language.isoen
dc.publisherInstitute of Physics
dc.title.enSi and Ge allotrope heterostructured nanowires: experimental evaluation of the thermal conductivity reduction
dc.typeArticle de revue
dc.identifier.doi10.1088/1361-6528/ab29a6
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
bordeaux.journalNanotechnology
bordeaux.page375704
bordeaux.volume30
bordeaux.issue37
bordeaux.peerReviewedoui
hal.identifierhal-02174973
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02174973v1
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