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Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

Heat conduction in silicon can be effectively engineered by means of sub-micrometre porous thin free-standing membranes. Tunable thermal properties make these structures good candidates for integrated heat management units such as waste heat recovery, rectification or efficient heat dissipation. How...

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Autores principales: Graczykowski, B., El Sachat, A., Reparaz, J. S., Sledzinska, M., Wagner, M. R., Chavez-Angel, E., Wu, Y., Volz, S., Alzina, F., Sotomayor Torres, C. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5583326/
https://www.ncbi.nlm.nih.gov/pubmed/28871197
http://dx.doi.org/10.1038/s41467-017-00115-4
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author Graczykowski, B.
El Sachat, A.
Reparaz, J. S.
Sledzinska, M.
Wagner, M. R.
Chavez-Angel, E.
Wu, Y.
Volz, S.
Wu, Y.
Alzina, F.
Sotomayor Torres, C. M.
author_facet Graczykowski, B.
El Sachat, A.
Reparaz, J. S.
Sledzinska, M.
Wagner, M. R.
Chavez-Angel, E.
Wu, Y.
Volz, S.
Wu, Y.
Alzina, F.
Sotomayor Torres, C. M.
author_sort Graczykowski, B.
collection PubMed
description Heat conduction in silicon can be effectively engineered by means of sub-micrometre porous thin free-standing membranes. Tunable thermal properties make these structures good candidates for integrated heat management units such as waste heat recovery, rectification or efficient heat dissipation. However, possible applications require detailed thermal characterisation at high temperatures which, up to now, has been an experimental challenge. In this work we use the contactless two-laser Raman thermometry to study heat dissipation in periodic porous membranes at high temperatures via lattice conduction and air-mediated losses. We find the reduction of the thermal conductivity and its temperature dependence closely correlated with the structure feature size. On the basis of two-phonon Raman spectra, we attribute this behaviour to diffuse (incoherent) phonon-boundary scattering. Furthermore, we investigate and quantify the heat dissipation via natural air-mediated cooling, which can be tuned by engineering the porosity.
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spelling pubmed-55833262017-09-07 Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures Graczykowski, B. El Sachat, A. Reparaz, J. S. Sledzinska, M. Wagner, M. R. Chavez-Angel, E. Wu, Y. Volz, S. Wu, Y. Alzina, F. Sotomayor Torres, C. M. Nat Commun Article Heat conduction in silicon can be effectively engineered by means of sub-micrometre porous thin free-standing membranes. Tunable thermal properties make these structures good candidates for integrated heat management units such as waste heat recovery, rectification or efficient heat dissipation. However, possible applications require detailed thermal characterisation at high temperatures which, up to now, has been an experimental challenge. In this work we use the contactless two-laser Raman thermometry to study heat dissipation in periodic porous membranes at high temperatures via lattice conduction and air-mediated losses. We find the reduction of the thermal conductivity and its temperature dependence closely correlated with the structure feature size. On the basis of two-phonon Raman spectra, we attribute this behaviour to diffuse (incoherent) phonon-boundary scattering. Furthermore, we investigate and quantify the heat dissipation via natural air-mediated cooling, which can be tuned by engineering the porosity. Nature Publishing Group UK 2017-09-04 /pmc/articles/PMC5583326/ /pubmed/28871197 http://dx.doi.org/10.1038/s41467-017-00115-4 Text en © The Author(s) 2017 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
Graczykowski, B.
El Sachat, A.
Reparaz, J. S.
Sledzinska, M.
Wagner, M. R.
Chavez-Angel, E.
Wu, Y.
Volz, S.
Wu, Y.
Alzina, F.
Sotomayor Torres, C. M.
Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
title Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
title_full Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
title_fullStr Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
title_full_unstemmed Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
title_short Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
title_sort thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5583326/
https://www.ncbi.nlm.nih.gov/pubmed/28871197
http://dx.doi.org/10.1038/s41467-017-00115-4
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