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Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials

Nanomaterials have been actively employed in various applications for energy and sustainability, such as biosensing, gas sensing, solar thermal energy conversion, passive radiative cooling, etc. Understanding thermal transports inside such nanomaterials is crucial for optimizing their performance fo...

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Detalles Bibliográficos
Autores principales: Dulhani, Jay, Lee, Bong Jae
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5575682/
https://www.ncbi.nlm.nih.gov/pubmed/28788053
http://dx.doi.org/10.3390/nano7080200
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author Dulhani, Jay
Lee, Bong Jae
author_facet Dulhani, Jay
Lee, Bong Jae
author_sort Dulhani, Jay
collection PubMed
description Nanomaterials have been actively employed in various applications for energy and sustainability, such as biosensing, gas sensing, solar thermal energy conversion, passive radiative cooling, etc. Understanding thermal transports inside such nanomaterials is crucial for optimizing their performance for different applications. In order to probe the thermal transport inside nanomaterials or nanostructures, tip-based nanoscale thermometry has often been employed. It has been well known that phonon transport in nanometer scale is fundamentally different from that occurred in macroscale. Therefore, Fourier’s law that relies on the diffusion approximation is not ideally suitable for describing the phonon transport occurred in nanostructures and/or through nanoscale contact. In the present study, the gray Boltzmann transport equation (BTE) is numerically solved using finite volume method. Based on the gray BTE, phonon transport through the constriction formed by a probe itself as well as the nanoscale contact between the probe tip and the specimen is investigated. The interaction of a probe and a specimen (i.e., treated as a substrate) is explored qualitatively by analyzing the temperature variation in the tip-substrate configuration. Besides, each contribution of a probe tip, tip-substrate interface, and a substrate to the thermal resistance are analyzed for wide ranges of the constriction ratio of the probe.
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spelling pubmed-55756822017-09-01 Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials Dulhani, Jay Lee, Bong Jae Nanomaterials (Basel) Communication Nanomaterials have been actively employed in various applications for energy and sustainability, such as biosensing, gas sensing, solar thermal energy conversion, passive radiative cooling, etc. Understanding thermal transports inside such nanomaterials is crucial for optimizing their performance for different applications. In order to probe the thermal transport inside nanomaterials or nanostructures, tip-based nanoscale thermometry has often been employed. It has been well known that phonon transport in nanometer scale is fundamentally different from that occurred in macroscale. Therefore, Fourier’s law that relies on the diffusion approximation is not ideally suitable for describing the phonon transport occurred in nanostructures and/or through nanoscale contact. In the present study, the gray Boltzmann transport equation (BTE) is numerically solved using finite volume method. Based on the gray BTE, phonon transport through the constriction formed by a probe itself as well as the nanoscale contact between the probe tip and the specimen is investigated. The interaction of a probe and a specimen (i.e., treated as a substrate) is explored qualitatively by analyzing the temperature variation in the tip-substrate configuration. Besides, each contribution of a probe tip, tip-substrate interface, and a substrate to the thermal resistance are analyzed for wide ranges of the constriction ratio of the probe. MDPI 2017-07-28 /pmc/articles/PMC5575682/ /pubmed/28788053 http://dx.doi.org/10.3390/nano7080200 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Dulhani, Jay
Lee, Bong Jae
Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials
title Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials
title_full Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials
title_fullStr Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials
title_full_unstemmed Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials
title_short Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials
title_sort phonon transport through nanoscale contact in tip-based thermal analysis of nanomaterials
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5575682/
https://www.ncbi.nlm.nih.gov/pubmed/28788053
http://dx.doi.org/10.3390/nano7080200
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