Hydrothermal synthesis of stable metallic 1T phase WS2 nanosheets for thermoelectric application

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Title
Hydrothermal synthesis of stable metallic 1T phase WS2 nanosheets for thermoelectric application
Author(s)
Mingxing Piao; Jin Chu; Xiao Wang; Yao Chi; Heng Zhang; Chaolong Li; Haofei Shi; Min-Kyu Joo
Publication Date
2018-01
Journal
NANOTECHNOLOGY, v.29, no.2, pp.025705 -
Publisher
IOP PUBLISHING LTD
Abstract
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. © 2017 IOP Publishing Ltd.
URI
https://pr.ibs.re.kr/handle/8788114/4311
ISSN
0957-4484
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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