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Title: Structure-thermal property correlation of aligned silicon dioxide nanorod arrays
Author: Zhu, Jie1, 2; Zhu, Yu3; Wu, Xuewang1; Song, Helun3; Zhang, Yaohui3; Wang, Xiaojia1
Source: APPLIED PHYSICS LETTERS
Issued Date: 2016-06-06
Volume: 108, Issue:23
DOI: 10.1063/1.4953625
DOC Type: Article
English Abstract: Quantitative characterization of thermal properties of nanorod (NR) arrays appears to be challenging due to the complex combination of high volume of air voids, anisotropy, and structural non-uniformity. This work investigates the structure-thermal property correlation of arrays consisting of either vertically aligned or slanted silicon dioxide (SiO2) NRs, fabricated by the dynamic shadowing growth technique. We apply the frequency-dependent time-domain thermoreflectance method to quantify the thermal properties of SiO2 NR arrays that may possess inhomogeneity along the depth direction. The effective thermal conductivities of four SiO2 NR array films and one reference capping layer for the SiO2 NR array are obtained. The impact of the structure on the effective thermal conductivities of the SiO2 NR array is discussed. The lowest effective thermal conductivity among all samples in this work is found to be 0.13 W m(-1) K-1 for the slanted NR array. We attribute the reduction in the effective thermal conductivity of the NR array to the discontinuous nature of SiO2 NRs, which reduces the density of the thermal transport channels and thus prevents heat flux from propagating downwards along the through-plane direction. The results from this work facilitate the potential applications of NR-array-based thermal insulators for micro-thermal devices. Published by AIP Publishing.
WOS Headings: Science & Technology ; Physical Sciences
WOS Subject: Physics, Applied
WOS Subject Extended: Physics
WOS Keyword Plus: GLANCING ANGLE DEPOSITION ; THIN-FILMS ; MICROPOROUS MEMBRANES ; CONDUCTIVITY ; NANOWIRES ; AEROGELS
Indexed Type: SCI
Funder: National Science Foundation (NSF) through the University of Minnesota MRSEC(DMR-1420013) ; National Natural Science Foundation of China(51336009 ; Suzhou International Sci. and Tech. Cooperation Program(SH201111) ; Strategic Leading Science and Technology Special of the Chinese Academy of Sciences(XDA06010705) ; 51206167)
Language: 英语
WOS ID: WOS:000378924700014
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112453
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Univ Minnesota, Dept Mech Engn, 111 Church St SE, Minneapolis, MN 55455 USA
2.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Suzhou Inst Nanotechnol & Nanobion, Suzhou 215123, Jiangsu, Peoples R China
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