Thermal properties across 2D-layered materials

by Emigdio Chavez Angel (Catalan Institute of Nanoscience and Nanotechnology)

Wednesday 8 Nov 2023, 12:00 → 13:00 Europe/Madrid

Maxwell auditorium (ALBA Synchrotron)

Abstract

This work presents a comprehensive overview of three interrelated scientific investigations that collectively address the engineering of thermal transport in two-dimensional (2D) materials. In these studies, various aspects of thermal management and control are explored. The first study demonstrates the successful engineering of ultra-thin lattice mismatched Bi₂Se₃/MoSe₂ superlattices and graphene/PdSe₂ heterostructures using molecular beam epitaxy.[1] The second study provides a comparative investigation of the impact of crystallinity and film thickness on the acoustic and thermal properties of layered PtSe₂ films. The research reveals the potential for tuning lattice thermal conductivity through crystallinity, demonstrating a reduction in thermal conductivity for polycrystalline films compared to their crystalline counterparts. Additionally, the study highlights the significance of optical phonons in thermal conductivity and uncovers strong interlayer interactions and acoustic phonon lifetimes. [2] In the third study, a systematic examination of in-plane and cross-plane thermal conductivity in crystalline SnSe₂ films with varying thickness is presented. The research uncovers a thickness-independent thermal conductivity anisotropy ratio and a consistent decrease in thermal conductivity with decreasing film thickness. Furthermore, the study identifies the contributions of phonons with different mean free paths to the overall thermal conductivity.[3] Collectively, these three studies offer a holistic perspective on the engineering of thermal transport in 2D materials. They provide crucial insights into synthesis, characterization, and thermal behaviour, ultimately contributing to the advancement of thermal management technologies and the development of tailored thermoelectric devices.

References

1. E. Chavez-Angel et al., Nano Lett. 23, 6883–6891 (2023)
2. A. El Sachat et al., npj 2D Mater Appl 6, 32 (2022)
3. P. Xiao et al., Nano Lett. 21, 9172–9179 (2021)

 

Keywords: 2D-Materials, thermal properties, thermal management, acoustic properties 

 

InCAEM Project