Simple Layer-by-Layer Assembly Method for Simultaneously Enhanced Electrical Conductivity and Thermopower of PEDOT:PSS/ce-MoS2 Heterostructure Films

被引：56

作者：

Wang, Xiaodong ^{[1
,2
]}

Meng, Fanling ^{[2
]}

Jiang, Qinglin ^{[1
]}

Zhou, Weiqiang ^{[1
]}

Jiang, Fengxing ^{[1
]}

Wang, Tongzhou ^{[1
]}

Li, Xia ^{[1
]}

Li, Si ^{[2
]}

Lin, Yuancheng ^{[1
]}

Xu, Jingkun ^{[1
]}

机构：

[1] Jiangxi Sci & Technol Normal Univ, Dept Phys, Nanchang 330013, Jiangxi, Peoples R China

[2] Jilin Univ, Coll Mat Sci & Engn, State Key Lab Inorgan Synth & Preparat Chem, Key Lab Automobile Mat,Minist Educ, Changchun 130012, Jilin, Peoples R China

来源：

ACS APPLIED ENERGY MATERIALS | 2018年 / 1卷 / 07期

基金：

中国国家自然科学基金;

关键词：

PEDOT:PSS; MoS2; layer-by-layer assembly; heterostructure; thermoelectric thin film; TUNING THERMOELECTRIC PROPERTIES; THIN-FILM; POWER FACTOR; MOS2; NANOSHEETS; LARGE-AREA; PERFORMANCE; COMPOSITE; PEDOT; GRAPHENE; NANOCRYSTAL;

D O I：

10.1021/acsaem.8b00315

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The organic/inorganic composites are considered as a promising strategy to gain high thermoelectric (TE) performance. Although many efforts have been focused on composites, complicated methods are real hindrance to the development of TE materials. Here, we demonstrate a potential TE thin film comprising highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and chemically exfoliated MoS2 (ce-MoS2) nanosheets by layer-by-layer (LbL) assembly method. This work achieves the effective integration of composite, treatment, and electron transfer based on the advantages of PEDOT:PSS and ce-MoS2. On the one hand, the negative charged ce-MoS2 nanosheets facilitate the formation of heterostructure TE films with positive charged PEDOT and reduce the oxidation level of PEDOT, which would favor an enhanced thermopower (21.9 mu V K-1). On the other hand, the simultaneous enhancement in the electrical conductivity (867 S cm(-1)) of PEDOT:PSS/ce-MoS2 composite film is caused by dimethyl sulfoxide (DMSO) worked as the dispersion of ce-MoS2, which corresponds to the removal of the excess nonconductive PSS and the molecular conformation arrangement of PEDOT:PSS. This LbL assembly method incorporating electron-rich ce-MoS2 and DMSO has been confirmed to be an effective strategy to yield a simultaneous enhancement of electrical conductivity and thermopower. The optimized power factor is achieved to be 41.6 mu W m(-1) K-2 at the layer number of 4, which surpass that of the single-layer PEDOT:PSS film by a factor of 5. This work may provide a fundamental understanding of and design principles on how to build PEDOT:PSS-based composite films with highly enhanced TE performance, which can be potentially used in TE energy harvesting systems.

引用

页码：3123 / 3133

页数：21