中国科学院重庆绿色智能技术研究院机构知识库

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	Hydrothermal synthesis of stable metallic 1T phase WS2 nanosheets for thermoelectric application
	Piao, Mingxing1; Chu, Jin1; Wang, Xiao1; Chi, Yao1; Zhang, Heng1; Li, Chaolong1; Shi, Haofei1; Joo, Min-Kyu2
	2018
摘要	Two-dimensional materials have gained great attention as a promising thermoelectric (TE) material due to their unique density of state with confined electrons and holes. Here, we synthesized 1T phase tungsten disulfide (WS2) nanosheets with high TE performance via the hydrothermal method. Flexible WS2 nanosheets restacked thin films were fabricated by employing the vacuum filtration technique. The measured electrical conductivity was 45 S cm(-1) with a Seebeck coefficient of + 30 mu V K-1 at room temperature, indicating a p-type characteristic. Furthermore, the TE performance could be further improved by thermal annealing treatment. It was found the electrical conductivity could be enhanced 2.7 times without sacrificing the Seebeck coefficient, resulting in the power factor of 9.40 mu W m(-1) K-2. Moreover, such 1T phase WS2 nanosheets possess high phase stability since the TE properties maintained constant at least half one year in the air atmosphere. Notably, other kinds of 1T phase transitional metal dichalcogenides (TMDCs) with excellent TE performance also could be imitated by using the procedure in this work. Finally, we believe a variety of materials based on 1T phase TMDCs nanosheets have great potential as candidate for future TE applications.
关键词	1T phase WS2 nanosheets hydrothermal method phase stability TE properties
DOI	10.1088/1361-6528/aa9bfe
发表期刊	NANOTECHNOLOGY
ISSN	0957-4484
卷号	29期号:2页码:8
收录类别	SCI
WOS记录号	WOS:000417823400001
语种	英语