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Enhancing Thermal Transport in Layered Nanomaterials
A comprehensive rational thermal material design paradigm requires the ability to reduce and enhance the thermal conductivities of nanomaterials. In contrast to the existing ability to reduce the thermal conductivity, methods that allow to enhance heat conduction are currently limited. Enhancing the...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5789832/ https://www.ncbi.nlm.nih.gov/pubmed/29382869 http://dx.doi.org/10.1038/s41598-018-20183-w |
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author | Malhotra, Abhinav Kothari, Kartik Maldovan, Martin |
author_facet | Malhotra, Abhinav Kothari, Kartik Maldovan, Martin |
author_sort | Malhotra, Abhinav |
collection | PubMed |
description | A comprehensive rational thermal material design paradigm requires the ability to reduce and enhance the thermal conductivities of nanomaterials. In contrast to the existing ability to reduce the thermal conductivity, methods that allow to enhance heat conduction are currently limited. Enhancing the nanoscale thermal conductivity could bring radical improvements in the performance of electronics, optoelectronics, and photovoltaic systems. Here, we show that enhanced thermal conductivities can be achieved in semiconductor nanostructures by rationally engineering phonon spectral coupling between materials. By embedding a germanium film between silicon layers, we show that its thermal conductivity can be increased by more than 100% at room temperature in contrast to a free standing thin-film. The injection of phonons from the cladding silicon layers creates the observed enhancement in thermal conductivity. We study the key factors underlying the phonon injection mechanism and find that the surface conditions and layer thicknesses play a determining role. The findings presented here will allow for the creation of nanomaterials with an increased thermal conductivity. |
format | Online Article Text |
id | pubmed-5789832 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-57898322018-02-15 Enhancing Thermal Transport in Layered Nanomaterials Malhotra, Abhinav Kothari, Kartik Maldovan, Martin Sci Rep Article A comprehensive rational thermal material design paradigm requires the ability to reduce and enhance the thermal conductivities of nanomaterials. In contrast to the existing ability to reduce the thermal conductivity, methods that allow to enhance heat conduction are currently limited. Enhancing the nanoscale thermal conductivity could bring radical improvements in the performance of electronics, optoelectronics, and photovoltaic systems. Here, we show that enhanced thermal conductivities can be achieved in semiconductor nanostructures by rationally engineering phonon spectral coupling between materials. By embedding a germanium film between silicon layers, we show that its thermal conductivity can be increased by more than 100% at room temperature in contrast to a free standing thin-film. The injection of phonons from the cladding silicon layers creates the observed enhancement in thermal conductivity. We study the key factors underlying the phonon injection mechanism and find that the surface conditions and layer thicknesses play a determining role. The findings presented here will allow for the creation of nanomaterials with an increased thermal conductivity. Nature Publishing Group UK 2018-01-30 /pmc/articles/PMC5789832/ /pubmed/29382869 http://dx.doi.org/10.1038/s41598-018-20183-w Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Malhotra, Abhinav Kothari, Kartik Maldovan, Martin Enhancing Thermal Transport in Layered Nanomaterials |
title | Enhancing Thermal Transport in Layered Nanomaterials |
title_full | Enhancing Thermal Transport in Layered Nanomaterials |
title_fullStr | Enhancing Thermal Transport in Layered Nanomaterials |
title_full_unstemmed | Enhancing Thermal Transport in Layered Nanomaterials |
title_short | Enhancing Thermal Transport in Layered Nanomaterials |
title_sort | enhancing thermal transport in layered nanomaterials |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5789832/ https://www.ncbi.nlm.nih.gov/pubmed/29382869 http://dx.doi.org/10.1038/s41598-018-20183-w |
work_keys_str_mv | AT malhotraabhinav enhancingthermaltransportinlayerednanomaterials AT kotharikartik enhancingthermaltransportinlayerednanomaterials AT maldovanmartin enhancingthermaltransportinlayerednanomaterials |