Anisotropic in-plane thermal conductivity of black phosphorus nanoribbons at temperatures higher than 100 K.

ABSTRACT: Black phosphorus attracts enormous attention as a promising layered material for electronic, optoelectronic and thermoelectric applications. Here we report large anisotropy in in-plane thermal conductivity of single-crystal black phosphorus nanoribbons along the zigzag and armchair lattice directions at variable temperatures. Thermal conductivity measurements were carried out under the condition of steady-state longitudinal heat flow using suspended-pad micro-devices. We discovered increasing thermal conductivity anisotropy, up to a factor of two, with temperatures above 100 K. A size effect in thermal conductivity was also observed in which thinner nanoribbons show lower thermal conductivity. Analysed with the relaxation time approximation model using phonon dispersions obtained based on

SUBMITTER: Lee S 

PROVIDER: S-EPMC4634207 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature