Enhancing Thermal Transport in Layered Nanomaterials

Abstract 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. Enha...

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Auteurs principaux:	Abhinav Malhotra, Kartik Kothari, Martin Maldovan
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2018
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/df992f6964504c0c8daf052b8dda4a1d
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spelling	oai:doaj.org-article:df992f6964504c0c8daf052b8dda4a1d2021-12-02T15:09:02ZEnhancing Thermal Transport in Layered Nanomaterials10.1038/s41598-018-20183-w2045-2322https://doaj.org/article/df992f6964504c0c8daf052b8dda4a1d2018-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20183-whttps://doaj.org/toc/2045-2322Abstract 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.Abhinav MalhotraKartik KothariMartin MaldovanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-6 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Abhinav Malhotra Kartik Kothari Martin Maldovan Enhancing Thermal Transport in Layered Nanomaterials
description	Abstract 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	article
author	Abhinav Malhotra Kartik Kothari Martin Maldovan
author_facet	Abhinav Malhotra Kartik Kothari Martin Maldovan
author_sort	Abhinav Malhotra
title	Enhancing Thermal Transport in Layered Nanomaterials
title_short	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_sort	enhancing thermal transport in layered nanomaterials
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/df992f6964504c0c8daf052b8dda4a1d
work_keys_str_mv	AT abhinavmalhotra enhancingthermaltransportinlayerednanomaterials AT kartikkothari enhancingthermaltransportinlayerednanomaterials AT martinmaldovan enhancingthermaltransportinlayerednanomaterials
_version_	1718387970969436160

Enhancing Thermal Transport in Layered Nanomaterials

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