Anisotropic heat conduction in silicon nanowire network revealed by   Raman scattering
  Anisotropic nanomaterials possess interesting thermal transport properties because they allow orientation of heat fluxes along preferential directions due to a high ratio (up to three orders of magnitude) between their in-plane and cross-plane thermal conductivities. Among different techniques allowing thermal conductivity evaluation, micro-Raman scattering is known to be one of the most efficient contactless measurement approaches. In this letter, a new experimental approach based on Raman scattering measurements with variable laser spot sizes is reported. Correlation between experimental and calculated thermal resistances of one-dimensional nanocrystalline solids allows simultaneous estimation of their in-plane and cross-plane thermal conductivities. In particular, our measurement approach is illustrated to be successfully applied for anisotropic thermal conductivity evaluation of silicon nanowire arrays. 
Mykola Isaiev, Oles Didukh, Tetyana Nychyporuk, Victor Timoshenko and   Vladimir Lysenko
cond-mat.mtrl-sci