Scaling Behavior of Thermal Conductivity in Single-Crystalline α-Fe 2 O 3 Nanowires

Unveiling the thermal transport properties of the various one-dimensional (1D) or quasi-1D materials like nanowires, nanotubes and nanorods is of great importance both theoretically and experimentally. The dimensional or size dependence of thermal conductivity is crucial in understanding the phonon-phonon interaction in low-dimensional systems. In this paper, we experimentally investigate the size-dependent thermal conductivity of individual single crystalline α-Fe2O3 nanowires collaborating the suspended thermal bridge method and the focused electron-beam self-heating technique, with the sample diameter (d) ranging from 180 nm to 661 nm and length (L) changing from 4.84 μm to 20.73 μm. An empirical relationship for diameter-/length-dependent thermal conductivity is observed, which shows an approximately linear dependence of aspect ratio (L/(1+Cd)) dependence at T=300 K, where C is a fitting parameter. This is related to the boundary scattering and diameter effect of α-Fe2O3 nanowires although rigorous calculations are needed to be further promoted.