What is it about?
Despite their similar puckered (hinge-like) structure along the armchair direction as phosphorene, the four monolayer 2D orthorhombic group IV–VI compounds (GeS, GeSe, SnS and SnSe) possess diverse anisotropic properties in many aspects, such as phonon group velocity, Young's modulus and lattice thermal conductivity (κ), etc.
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Why is it important?
New classes of two-dimensional (2D) materials beyond graphene, including layered and non-layered, and their heterostructures, are currently attracting increasing interest due to their promising applications in nanoelectronics, optoelectronics and clean energy, where thermal transport is a fundamental physical parameter. This study not only presents comprehensive investigations on the phonon transport properties of a new family of 2D orthorhombic group IV–VI compounds (GeS, GeSe, SnS and SnSe), but also provides discussions and analysis on the origins of the diverse anisotropy, which enriches the understanding of nanoscale phonon transport in 2D materials, and would be of significance for further study and applications in emerging technologies.
Perspectives
The diverse anisotropy of the new family of 2D orthorhombic group IV–VI compounds (GeS, GeSe, SnS and SnSe) is fascinating. Moreover, the low thermal conductivity and its anisotropy may be resulted from the "resonant bonding", which is due to their specific hinge-like structures.
Mr Guangzhao Qin
RWTH Aachen University
Read the Original
This page is a summary of: Diverse anisotropy of phonon transport in two-dimensional group IV–VI compounds: A comparative study, Nanoscale, January 2016, Royal Society of Chemistry,
DOI: 10.1039/c6nr01349j.
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