Scaling behavior of thermal conductivity in single-crystalline alpha-Fe2O3 nanowires

Unveiling the thermal transport properties of various one-dimensional (1D) or quasi-1D materials like nanowires, nanotubes, and nanorods is of great importance both theoretically and experimentally. The dimension or size dependence of thermal conductivity is crucial in understanding the phonon-phonon interaction in the low-dimensional systems. In this paper, we experimentally investigate the size-dependent thermal conductivity of individual single crystalline alpha-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 mu m to 20.73 mu m. An empirical relationship for diameter-/length-dependent thermal conductivity is obtained, which shows an approximately linear dependence on the aspect ratio (L/(1 +Cd)) at T= 300 K, whereCis a fitting parameter. This is related to the boundary scattering and diameter effect of alpha-Fe2O3 nanowires although rigorous calculations are needed to confirm the result.