Thermal conductivity of periodic array of intermolecular junctions of silicon nanowires

Xueming Yang, Albert C. To*, Mesut Kirca

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Recent studies on intramolecular junctions of silicon nanowires and carbon nanotubes have revealed a wealth of intriguing phenomena. However, the thermal properties of the intramolecular junctions of silicon nanowires (SiNWs) are not yet well understood. In this study periodic arrays of intramolecular junctions with different lattice orientations are investigated, and their thermal conductivities are calculated using nonequilibrium molecular dynamics (NEMD) simulations. Different from the X-shaped and Y-shaped junctions of carbon nanotubes, no distinct jump is found in the temperature profile at the junctions. Compared with straight pristine SiNWs of the same length, the thermal conductivity of the periodic array of intramolecular junctions is reduced. The underlying mechanism of the observed behavior is analyzed by the phonon spectral density of the atomic velocities. The dependence of temperature on the thermal conductivity of this junction array structure is discussed.

Original languageEnglish
Pages (from-to)141-145
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume44
Issue number1
DOIs
Publication statusPublished - Oct 2011
Externally publishedYes

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