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Page 10 of 26 Wang et al. Soft Sci 2023;3:34 https://dx.doi.org/10.20517/ss.2023.25

Figure 7. (A) Schematic illustration of the preparation and hydrazine-treatment process of the PEDOT:PSS/graphene composite films;
(B) Photographs of dispersion of PEDOT:PSS, graphene, and PEDOT:PSS/graphene in DMF after sonication; (C) Photos of PEDOT:PSS,
©
graphene, and PEDOT:PSS/graphene films. Reproduced with permission from Ref [58] . Copyright 2015. American Chemical Society.
DMF: N,N-Dimethylformamide; PEDOT:PSS: poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid).

Figure 8. (A) Schematic illustration of the preparation procedures of the PEDOT:SWCNT composites with the IL; (B-E) Dependences of
TE performance on IL content for PEDOT:PSS/SWCNT composites with different SWCNT contents: (B) 30 wt% SWCNT; (C) 60 wt%
SWCNT; and (D) 90 wt% SWCNT; (E) dependence of TE performance on SWCNT content for the PEDOT:PSS/SWCNT-IL50
©
composite. Reproduced with permission from Ref [64] . Copyright 2021. American Chemical Society. PEDOT:PSS: Poly(3,4-
ethylenedioxythiophene):poly(4-styrenesulfonic acid); SWCNT: single-walled carbon nanotube; TE: thermoelectric.

fantastic property of CNTs is that their conduction type can be easily converted from p- to n-type through
the n-type doping method by different reducing agents [66,67] . Then Song et al. prepared flexible and
lightweight TEGs by vacuum filtrated PEDOT:PSS/SWCNTs as p-type materials and polyethyleneimine-
[68]
doped SWCNTs as n-type materials, respectively .
Liang et al. have researched the TE properties of conducting polymer/carbon nanoparticle composite
prepared by combining chemical oxidative polymerization and vacuum filtration. For example, a large-area
stretchable, super flexible, and mechanically stable PPy/SWCNT film with a diameter of ~18 cm was
achieved by an in situ chemical oxidative polymerization of pyrrole monomer in the SWCNT solution,
followed by vacuum filtration . Further, they designed a unique layered morphology containing
[69]
nanosheets of SWCNTs sandwiched by PPy NWs via physical mixing and vacuum filtration in different