Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 소홍윤 | - |
dc.date.accessioned | 2019-12-07T23:57:23Z | - |
dc.date.available | 2019-12-07T23:57:23Z | - |
dc.date.issued | 2018-05 | - |
dc.identifier.citation | NANOSCALE, v. 10, no. 23, page. 11117-11122 | en_US |
dc.identifier.issn | 2040-3364 | - |
dc.identifier.issn | 2040-3372 | - |
dc.identifier.uri | https://pubs.rsc.org/en/content/articlelanding/2018/NR/C8NR01788C#!divAbstract | - |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/118556 | - |
dc.description.abstract | Thermal conduction in complex periodic nanostructures remains a key area of open questions and research, and a particularly provocative and challenging detail is the impact of nanoscale material volumes that do not lie along the optimal line of sight for conduction. Here, we experimentally study thermal transport in silicon nanoladders, which feature two orthogonal heat conduction paths: unobstructed line-of-sight channels in the axial direction and interconnecting bridges between them. The nanoladders feature an array of rectangular holes in a 10 m long straight beam with a 970 nm wide and 75 nm thick cross-section. We vary the pitch of these holes from 200 nm to 1100 nm to modulate the contribution of bridges to the net transport of heat in the axial direction. The effective thermal conductivity, corresponding to reduced heat flux, decreases from approximate to 45 W m(-1) K-1 to approximate to 31 W m(-1) K-1 with decreasing pitch. By solving the Boltzmann transport equation using phonon mean free paths taken from ab initio calculations, we model thermal transport in the nanoladders, and experimental results show excellent agreement with the predictions to within approximate to 11%. A combination of experiments and calculations shows that with decreasing pitch, thermal transport in nanoladders approaches the counterpart in a straight beam equivalent to the line-of-sight channels, indicating that the bridges constitute a thermally dead volume. This study suggests that ballistic effects are dictated by the line-of-sight channels, providing key insights into thermal conduction in nanostructured metamaterials. | en_US |
dc.description.sponsorship | This work was supported by the National Science Foundation under grant no. 1336734. The work at UTSA was supported by the University of Texas System Faculty Science and Technology Acquisition and Retention (STARs) program. J. S. K. thanks the Semiconductor Research Corporation and the Intel Education Alliance for a Graduate Research Fellowship. Work at MIT was supported by the "Solid State Solar-Thermal Energy Conversion Center (S3TEC)," an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0001299/DE-FG02-09ER46577. Sample preparation and characterization were performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under award ECCS-1542152. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | ROYAL SOC CHEMISTRY | en_US |
dc.subject | HOLEY SILICON | en_US |
dc.subject | TRANSPORT | en_US |
dc.subject | NANOWIRES | en_US |
dc.subject | CRYSTAL | en_US |
dc.subject | FILMS | en_US |
dc.subject | SCATTERING | en_US |
dc.subject | TEMPERATURE | en_US |
dc.subject | NM | en_US |
dc.title | Impact of thermally dead volume on phonon conduction along silicon nanoladders | en_US |
dc.type | Article | en_US |
dc.relation.no | 23 | - |
dc.relation.volume | 10 | - |
dc.identifier.doi | 10.1039/c8nr01788c | - |
dc.relation.page | 11117-11122 | - |
dc.relation.journal | NANOSCALE | - |
dc.contributor.googleauthor | Park, Woosung | - |
dc.contributor.googleauthor | Sohn, Joon | - |
dc.contributor.googleauthor | Romano, Giuseppe | - |
dc.contributor.googleauthor | Kodama, Takashi | - |
dc.contributor.googleauthor | Sood, Aditya | - |
dc.contributor.googleauthor | Katz, Joseph S. | - |
dc.contributor.googleauthor | Kim, Brian S. Y. | - |
dc.contributor.googleauthor | So, Hongyun | - |
dc.contributor.googleauthor | Ahn, Ethan C. | - |
dc.contributor.googleauthor | Asheghi, Mehdi | - |
dc.relation.code | 2018000106 | - |
dc.sector.campus | S | - |
dc.sector.daehak | COLLEGE OF ENGINEERING[S] | - |
dc.sector.department | DIVISION OF MECHANICAL ENGINEERING | - |
dc.identifier.pid | hyso | - |
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