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

08:00 EDT 13th June 2019 | BioPortfolio

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

We 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 phase along the <111> axis. Using 3ω-SThM (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. &#13.


Journal Details

This article was published in the following journal.

Name: Nanotechnology
ISSN: 1361-6528


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