Volume 18, Issue 2 ((Iranian Journal of Physics Research,Summer 2018)                   IJPR 2018, 18(2): 322-329 | Back to browse issues page

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Department of Physics, University of Kashan, Kashan, Iran
Abstract:   (2360 Views)
This paper shows a theoretical study of the thermal properties of armchair grapehen nanoribbons in the presence of extended vacancies. Each graphene nanoribbons formed by superlattices with a periodic geometric structure, different size and symmetry of vacancies. The phonon dispersion, specific heat and thermal conductivity properties are described by a force-constant model and also by Landauer theory calculations. Our results show that the geometric structure of the vacancies and their positions have a significant roles in controlling the thermal properties, especially at low temperatures. Moreover, the out-of-plane and in-plane phonon modes exhibit a different role in the heat capacity and thermal phonon transport properties. Moreover, the out-of-plane phonon modes have more contribution in low temperature regime rather than in-plane phonon modes even in the presence of extended vacancies. The result may be useful for the design and improvement of thermal or thermoelectric nanodevices.
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Type of Study: Research | Subject: Condensed Matter Physics