Synergistic enhancement of thermoelectric and mechanical performances of ionic liquid LiTFSI modulated PEDOT flexible films

Abstract

Ionic liquids modulated PEDOT films with synergistically enhanced thermoelectric and mechanical performances have promising applications in vigorous wearable electronics and IoT sensors.

Leaf‐Inspired Flexible Thermoelectric Generators with High Temperature Difference Utilization Ratio and Output Power in Ambient Air

“…The detailed structure schematic of proposed leaf‐TEG is as show in Figure 1c. Here we use a p‐type PEDOT:PSS free‐standing film(“p” in Figure 1c), [ 28,29 ] and an n‐type constantan film (“n” in Figure 1c), and an electrically insulating layer (90 µm thick double‐sided‐polyimide‐tape, marked as “i” in Figure 1c) to make leaf‐TEG. The fabrication process of the large‐area flexible PEDOT:PSS film and thermoelectric properties of PEDOT:PSS and constantan thin films are shown in Figures S1 and S2 (Supporting Information), respectively.…”

Benchmarking the Performance of Electropolymerized Poly(3,4‐ethylenedioxythiophene) Electrodes for Neural Interfacing

“…[49,50] Ionic liquids (IL) and EG, on the other hand, enhance the PEDOT electrical conductivity by structural and morphological re-arrangements (i.e., reorientation of PEDOT chains leading to more PEDOT-rich and betterconnected particles). [51,52] PEDOT nanotubes were reported to act as a "template" for PEDOT arrangement during poly merization and enhance film's electrical properties. [53,54] Figure 2b shows that irrespective of the additive, the polymers doped with ClO 4 exhibited higher specific capacitances than those doped with PSS.…”

Ionic liquid decoration for the hole transport improvement of PEDOT

“…As green solvents consisting of positively and negatively charged binary ionic compounds, which show a high performance in ion transport, ILs have been used as additives in widespread electronic equipment and ion batteries. [16][17][18][19][20][21] Because of the same binary nature of PEDOT and the counterion, ILs are highly interesting as treating agents for separating the counterion from the PEDOT domain from the point of view of ion exchange. 22 Meanwhile, recent explorations through both experiments [16][17][18][23][24][25] and theoretical calculations 22,26 have affirmed the critical role of ILs in regulating the doping, hole mobility, and conductivity of PEDOT in large spanning orders of magnitude from the side of the electronic properties.…”

“…[16][17][18][19][20][21] Because of the same binary nature of PEDOT and the counterion, ILs are highly interesting as treating agents for separating the counterion from the PEDOT domain from the point of view of ion exchange. 22 Meanwhile, recent explorations through both experiments [16][17][18][23][24][25] and theoretical calculations 22,26 have affirmed the critical role of ILs in regulating the doping, hole mobility, and conductivity of PEDOT in large spanning orders of magnitude from the side of the electronic properties. Similarly, taking the advantage of the adjustable ion ratio of IL, it has been observed in our previous work that regulating [EMIM]: [TFSI] with an excess of cation produces a significant improvement of hole mobility by 1-3 orders of magnitude with respect to the pristine PEDOT:Tos solution, while increasing the content of anion damages the molecular order and leads to a dynamic mobility 10 À2 to 10 0 cm 2 V À1 s À1 smaller than that of the pristine solution.…”