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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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2017-07-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/7/8/200 |
| _version_ | 1818266191299346432 |
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| author | Jay Dulhani Bong Jae Lee |
| author_facet | Jay Dulhani Bong Jae Lee |
| author_sort | Jay Dulhani |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-12T20:02:47Z |
| format | Article |
| id | doaj.art-c8621466493544d5a16a05c7a829325b |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-12T20:02:47Z |
| publishDate | 2017-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-c8621466493544d5a16a05c7a829325b2022-12-22T00:13:43ZengMDPI AGNanomaterials2079-49912017-07-017820010.3390/nano7080200nano7080200Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of NanomaterialsJay Dulhani0Bong Jae Lee1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, KoreaDepartment of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, KoreaNanomaterials 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.https://www.mdpi.com/2079-4991/7/8/200nanoscale constriction and contactBoltzmann transport equationphonon transport |
| spellingShingle | Jay Dulhani Bong Jae Lee Phonon Transport through Nanoscale Contact in Tip-Based Thermal Analysis of Nanomaterials Nanomaterials nanoscale constriction and contact Boltzmann transport equation phonon transport |
| 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 | nanoscale constriction and contact Boltzmann transport equation phonon transport |
| url | https://www.mdpi.com/2079-4991/7/8/200 |
| work_keys_str_mv | AT jaydulhani phonontransportthroughnanoscalecontactintipbasedthermalanalysisofnanomaterials AT bongjaelee phonontransportthroughnanoscalecontactintipbasedthermalanalysisofnanomaterials |