Extreme In-Plane Thermal Conductivity Anisotropy in Titanium Trisulfide Caused by Heat-Carrying Optical Phonons

doi:10.1021/acs.nanolett.0c01476

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	Extreme In-Plane Thermal Conductivity Anisotropy in Titanium Trisulfide Caused by Heat-Carrying Optical Phonons
	Liu, HL; Yu, XX; Wu, KD; Gao, Y; Tongay, S; Javey, A; Chen, LD; Hong, JW; Wu, JQ
	2020-07-08
Source Publication	NANO LETTERS
ISSN	1530-6984
Issue	7 Pages:5221
Subtype	Article
Abstract	High in-plane anisotropies arise in layered materials with large structural difference along different in-plane directions. We report an extreme case in layered TiS3, which features tightly bonded atomic chains along the b-axis direction, held together by weaker, interchain bonding along the a-axis direction. Experiments show thermal conductivity along the chain twice as high as between the chain, an in-plane anisotropy higher than any other layered materials measured to date. We found that in contrast to most other materials, optical phonons in TiS3 conduct an unusually high portion of heat (up to 66% along the b-axis direction). The large dispersiveness of optical phonons along the chains, contrasted to many fewer dispersive optical phonons perpendicular to the chains, is the primary reason for the observed high anisotropy in thermal conductivity. The finding discovers materials with unusual thermal conduction mechanism, as well as provides new material platforms for potential heat-routing or heat-managing devices.
DOI	10.1021/acs.nanolett.0c01476
WOS Keyword	TIS3 ; ELECTRONICS
Language	英语
WOS Research Area	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
Publisher	AMER CHEMICAL SOC
Citation statistics
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/27914
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Liu, HL,Yu, XX,Wu, KD,et al. Extreme In-Plane Thermal Conductivity Anisotropy in Titanium Trisulfide Caused by Heat-Carrying Optical Phonons[J]. NANO LETTERS,2020(7):5221.
APA	Liu, HL.,Yu, XX.,Wu, KD.,Gao, Y.,Tongay, S.,...&Wu, JQ.(2020).Extreme In-Plane Thermal Conductivity Anisotropy in Titanium Trisulfide Caused by Heat-Carrying Optical Phonons.NANO LETTERS(7),5221.
MLA	Liu, HL,et al."Extreme In-Plane Thermal Conductivity Anisotropy in Titanium Trisulfide Caused by Heat-Carrying Optical Phonons".NANO LETTERS .7(2020):5221.

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