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Design of Graphene Phononic Crystals for Heat Phonon Engineering

1
School of Material Science, Japan Advanced Institute of Science and Technology, Nomi 923-1211, Japan
2
Physics Department, Faculty of Science, Minia University, 11432 Main Road—Shalaby Land, Minia 61519, Egypt
3
Hitachi Cambridge Laboratory, Hitachi Europe Ltd., Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(7), 655; https://doi.org/10.3390/mi11070655
Received: 1 June 2020 / Revised: 29 June 2020 / Accepted: 30 June 2020 / Published: 30 June 2020
(This article belongs to the Section A:Physics)
Controlling the heat transport and thermal conductivity through a material is of prime importance for thermoelectric applications. Phononic crystals, which are a nanostructured array of specially designed pores, can suppress heat transportation owing to the phonon wave interference, resulting in bandgap formation in their band structure. To control heat phonon propagation in thermoelectric devices, phononic crystals with a bandgap in the THz regime are desirable. In this study, we carried out simulation on snowflake shaped phononic crystal and obtained several phononic bandgaps in the THz regime, with the highest being at ≈2 THz. The phononic bandgap position and the width of the bandgap were found to be tunable by varying the neck-length of the snowflake structure. A unique bandgap map computed by varying the neck-length continuously provides enormous amounts of information as to the size and position of the phononic bandgap for various pore dimensions. We have also carried out transmission spectrum analysis and found good agreement with the band structure calculations. The pressure map visualized at various frequencies validates the effectiveness of snowflake shaped nano-pores in suppressing the phonons partially or completely, depending on the transmission probabilities. View Full-Text
Keywords: graphene nanomesh; phononic bandgap; Finite Element Method (FEM) simulation; circle-cross-snowflake shaped nanopores; heat phonon engineering; graphene phononic crystals graphene nanomesh; phononic bandgap; Finite Element Method (FEM) simulation; circle-cross-snowflake shaped nanopores; heat phonon engineering; graphene phononic crystals
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Masrura, H.M.; Kareekunnan, A.; Liu, F.; Ramaraj, S.G.; Ellrott, G.; Hammam, A.M.M.; Muruganathan, M.; Mizuta, H. Design of Graphene Phononic Crystals for Heat Phonon Engineering. Micromachines 2020, 11, 655.

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