Speaker
Description
Two-dimensional (2D) materials such as hexagonal boron nitride (hBN) nanosheets exhibit highly anisotropic thermal conduction pathways, with significantly higher in-plane than out of plane thermal conductivity. This phenomenon increases the difficulty in measuring the in-plane thermal conductivity via conventional one-dimensional (1D) laser flash analysis (LFA) methods, which are commonly used in commercially available lab equipment.
In this work we present, a novel integrated method called “ZapTherm”, which combines spatially resolved thermographic analysis and 2D heat conduction models, to accurately determine thermal diffusivity and thermal conductivity of highly anisotropic composite thin films as well as isotropic bulk materials. The developed measurement method directly determines fundamental thermal quantities without relying on model-based fitting of experimental data, which has been the predominant approach to date. Furthermore, the method is applicable to both free-standing films and substrate-supported samples, enabling the characterization of a wide range of material systems, due to the selective isolation of sample response signal from substrate background.