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Title: Tuning thermal transport in graphene via combinations of molecular antiresonances
Authors: Sevim, Koray
Sevinçli, Haldun
Keywords: Graphene
Heat resistance
Thermal conductivity
Thermal management applications
Issue Date: Dec-2018
Publisher: Elsevier Ltd.
Source: Sevim, K., and Sevinçli, H. (2018). Tuning thermal transport in graphene via combinations of molecular antiresonances. Carbon, 140, 603-609. doi:10.1016/j.carbon.2018.08.050
Abstract: We propose a method to engineer the phonon thermal transport properties of low dimensional systems. The method relies on introducing a predetermined combination of molecular adsorbates, which give rise to antiresonances at frequencies specific to the molecular species. Despite their dissimilar transmission spectra, thermal resistances due to individual molecules remain almost the same for all species. On the other hand, thermal resistance due to combinations of different species are not additive and show large differences depending on the species. Using a toy model, the physics underlying the violation of resistance summation rule is investigated. It is demonstrated that equivalent resistance of two scatterers having the same resistances can be close to the sum of the constituents or ∼ 70% of it depending on the relative positions of the antiresonances. The relative positions of the antiresonances determine the net change in transmission, therefore the equivalent resistance. Since the entire spectrum is involved in phonon spectrum changes in different parts of the spectrum become important. Performing extensive first-principles based computations, we show that these distinctive attributes of phonon transport can be useful to tailor the thermal transport through low dimensional materials, especially for thermoelectric and thermal management applications.
ISSN: 0008-6223
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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