Far-Field Radiative Thermal Rectification Based on Asymmetric Emissivity.

This experimental study investigates thermal rectification via asymmetric far-field thermal radiation on a fused silica slab. An asymmetrical distribution of surface emissivity is created over the device by partially covering the fused silica with a 100 nm thick aluminum film. The slab is subjected to a thermal bias, and when this bias is reversed, a small temperature difference is observed between the different configurations.

Impact of Oxygen Stoichiometry on the Thermoelectric Properties of BiSrCoO Thin Films.

In this study, we present a comprehensive analysis of the thermoelectric (TE) properties of highly -axis-oriented thin films of layered misfit cobaltates BiSrCoO. The films exhibit a high -axis orientation, facilitating precise measurements of electronic transport and TE properties along the - crystallographic plane. Our findings reveal that the presence of nearly stoichiometric oxygen content results in high thermopower with metallic conductivity, while the annealing of the films in a reduced oxygen atmosphere eliminates their metallic behavior.

MoS phononic crystals for advanced thermal management.

Effective thermal management of electronic devices encounters substantial challenges owing to the notable power densities involved. Here, we propose layered MoS phononic crystals (PnCs) that can effectively reduce thermal conductivity (κ) with relatively small disruption of electrical conductivity (σ), offering a potential thermal management solution for nanoelectronics. These layered PnCs exhibit remarkable efficiency in reducing κ, surpassing that of Si and SiC PnCs with similar periodicity by ~100-fold.

Engineering Heat Transport Across Epitaxial Lattice-Mismatched van der Waals Heterointerfaces.

Artificially engineered 2D materials offer unique physical properties for thermal management, surpassing naturally occurring materials. Here, using van der Waals epitaxy, we demonstrate the ability to engineer extremely insulating thermal metamaterials based on atomically thin lattice-mismatched BiSe/MoSe superlattices and graphene/PdSe heterostructures with exceptional thermal resistances (70-202 m K/GW) and ultralow cross-plane thermal conductivities (0.012-0.

Enhanced Thermoelectric Properties of Misfit BiSrCaCoO: Isovalent Substitutions and Selective Phonon Scattering.

Layered Bi-misfit cobaltates, such as BiSrCoO, are the natural superlattice of an electrically insulating rocksalt (RS) type BiSrO layer and electrically conducting CoO layer, stacked along the crystallographic c-axis. RS and CoO layers are related through charge compensation reactions (or charge transfer). Therefore, thermoelectric transport properties are affected when doping or substitution is carried out in the RS layer.