Back to Search
Start Over
Design of Graphene Phononic Crystals for Heat Phonon Engineering
- Source :
- Micromachines, Vol 11, Iss 655, p 655 (2020), Micromachines, Volume 11, Issue 7
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- 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 &asymp<br />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.
- Subjects :
- Materials science
Band gap
Terahertz radiation
Phonon
lcsh:Mechanical engineering and machinery
Physics::Optics
02 engineering and technology
circle-cross-snowflake shaped nanopores
01 natural sciences
graphene nanomesh
Article
law.invention
Crystal
Condensed Matter::Materials Science
Thermal conductivity
law
phononic bandgap
Condensed Matter::Superconductivity
heat phonon engineering
0103 physical sciences
Thermoelectric effect
lcsh:TJ1-1570
Electrical and Electronic Engineering
Electronic band structure
010302 applied physics
Graphene
business.industry
Mechanical Engineering
021001 nanoscience & nanotechnology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Finite Element Method (FEM) simulation
graphene phononic crystals
Control and Systems Engineering
Optoelectronics
Condensed Matter::Strongly Correlated Electrons
0210 nano-technology
business
Subjects
Details
- Language :
- English
- Volume :
- 11
- Issue :
- 655
- Database :
- OpenAIRE
- Journal :
- Micromachines
- Accession number :
- edsair.doi.dedup.....ebe1cfd37a35789a90b691d2eb5bbf07