Sample SEM pictures: (a) Top view of the Whatman alumina matrix partially filled with Bi2Te3 nanowires whose diameter ranges between 200 nm and 400 nm, (b) Cross section view of the sample before polishing.
SThM imaging of Bi2Te3 nanowires embedded in an alumina matrix. (a) Topographic image. Yellow spots in this figure reveal the presence of nanowires. (b) (V3ω)Tip image. The centers of the nanowires show a lower (V3ω)Tip signal due to an increase of the heat flux in this region.
Equivalent thermal resistance distribution on the alumina and NWs parts of the sample.
Tip image (top left) and equivalent thermal schema of the thermal flux passing from the tip to a NW.
Composite thermal conductivity distribution on around 50 NWs.
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