Highly enhanced thermoelectric performance of WS2 nanosheets upon embedding PEDOT:PSS. Issue 13 (8th April 2017)

• Record Type: Journal Article
• Authors: Wang, Tongzhou; Liu, Congcong; Wang, Xiaodong; Li, Xia; Jiang, Fengxing; Li, Changcun; Hou, Jian; Xu, Jingkun
• Is Part Of: Journal of polymer science. Volume 55:Issue 13(2017)
• Page Start: 997
• Page End: 1004
• Publication Date: 2017-04-08
• Subjects: composite thin film -- electrical conductivity -- good transferability -- PEDOT:PSS -- WS2 nanosheets; 547
• DOI: 10.1002/polb.24349
• Languages: English
• ISSNs: 0887-6266

Abstract

ABSTRACT: Two‐dimensional (2D) WS2 nanosheets (NSs) as a promising thermoelectric (TE) material have gained great concern recently. The low electrical conductivity significantly limits its further development. Herein, we reported an effective method to enhance the TE performance of WS2 NSs by combining poly(3, 4‐ethylenedioxythiophene):poly(4‐styrenesulfonate) (PEDOT:PSS). The restacked WS2 NSs thin film with 1T phase structure obtained by a common chemical lithium intercalation show a high Seebeck coefficient of 98 μV K −1 and a poor electrical conductivity of 12.5 S cm −1 . The introduction of PEDOT:PSS with different contents obviously improve the electrical conductivity of WS2 NSs thin films. Although a declining Seebeck coefficient was observed, an optimized TE power factor of 45.2 μW m −1 k −1 was achieved for WS2 /PEDOT:PSS composite thin film. Moreover, the as‐prepared WS2 /PEDOT:PSS thin film can be easily peeled off and transferred to other substrate leading to a more promising application. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2017, 55, 997–1004 Abstract : The highly conductive PEDOT:PSS chains were interposed between the chemical exfoliated WS2 NSs through a simple direct dilution–filtration to make them closely combined together. The introduction of PEDOT:PSS is beneficial to the transport of carriers along the PEDOT:PSS chains and can reduce the energy barrier between the adjacent WS2 NSs. Additionally, this composite thin film can be easily peeled off with good transferability.