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Thermal management with a highly emissive and thermally conductive graphite absorber
Zhejiang Univ, Coll Opt Sci & Engn, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China..
Zhejiang Univ, Coll Opt Sci & Engn, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China..
Zhejiang Univ, Coll Opt Sci & Engn, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China..
Zhejiang Univ, Coll Opt Sci & Engn, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China..
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2019 (English)In: AIP Advances, ISSN 2158-3226, E-ISSN 2158-3226, Vol. 9, no 2, article id 025224Article in journal (Refereed) Published
Abstract [en]

Thermal management on a variety of length scales is essential for many industrial, solar and computational systems. Here we explore the thermal properties of a nearly perfect graphite absorber with both high emissivity and thermal conductivity which is fabricated by simple one-step etching. The hemispherical reflectance of the absorber is around 1% in the visible range and the normal specular reflectance is less than 1% from 1.5 mu m to 10 mu m. The thermal conductivity of the absorber is measured above 630 Wm(-1) K-1, which is 2.5 times larger than the aluminum used in commercial heat sinks. Heat dissipation testing indicates that a device is 3.7 +/- 2 degrees cooler with the graphite absorber as the heat spreader than a pristine graphite sheet and 9.1 +/- 2 degrees cooler than an Au-coated graphite sheet, primarily due to improved radiation cooling. A theoretical analysis accounts for the results. Further analysis suggests that the radiative heat dissipation is more prominent in the low-convection environment, especially for a convection coefficient below 10 Wm(-2) K-1. 

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2019. Vol. 9, no 2, article id 025224
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Physical Sciences
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URN: urn:nbn:se:kth:diva-247851DOI: 10.1063/1.5086064ISI: 000460029500087Scopus ID: 2-s2.0-85062261906OAI: oai:DiVA.org:kth-247851DiVA, id: diva2:1299120
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QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-04Bibliographically approved

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