On the mechanism of conductivity enhancement in PEDOT:PSS/PVA blend fiber induced by UV-light irradiation

Wang, Xinyue; Li, Mengjuan; Guyu, Feng; Ge, Mingqiao

doi:10.1007/s00339-019-3271-8

Cited by 19 publications

(27 citation statements)

References 26 publications

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“…30,31 In general, pristine PEDOT:PSS lms usually contains both benzoid and quinoid structural conformation. 23,32 In a benzoid (coiled) conformation, the C a -C b between two thiophene rings in the PEDOT chain is similar to s bond, which usually has a low density of conjugated p-electrons. Whereas in the case of quinoid (linear) conformation, adjacent thiophene rings nearly lie on the same plane resulting in the delocalization of conjugated p-electrons throughout the PEDOT chain.…”

Section: Resultsmentioning

confidence: 99%

“…Whereas in the case of quinoid (linear) conformation, adjacent thiophene rings nearly lie on the same plane resulting in the delocalization of conjugated p-electrons throughout the PEDOT chain. 23,32 Therefore, if the dominant conformation exists in PEDOT lms is in the form of quinoid (linear) structure will lead to increased conjugated length of PEDOT chain, thereby resulting in enhanced conductivity of the sample. In case of thiophene rings, UV irradiation leads to the red shi of the peak as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…15 The linewidth (deltaHpp) of the pristine PEDOT:PSS lms lies around 5.3 G, whereas the linewidth of the gamma-irradiated PEDOT:PSS lms are around 4.8 G. Thus, higher degree of charge delocalization is favorable for better conductivity in pristine samples in comparison to the irradiated lms in air and vacuum environments. 32 Fig. 7(a) and (b) shows the XPS spectra of the C1s peak before and aer irradiation in air and vacuum environments.…”

Section: Resultsmentioning

confidence: 99%

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Consequences of gamma-ray irradiation on structural and electronic properties of PEDOT:PSS polymer in air and vacuum environments

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Consequences of gamma-ray irradiation on structural and electronic properties of PEDOT:PSS polymer in air and vacuum environments

et al. 2021

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“…This is because Figure S3 shows 2.0% and 2.5% EMIM:TFSI-DMSO, films with a less significant red shift than films with NaBH 4 treated films. The quinoid structure as shown in Figure 3a has restricted rotation around the sp 2 carbon double bond on the thiophene backbone thereby adopting a planer structure with more crystalline packing relative to the benzoid (Figure 3b) structure in which more thiophene units adopt a helical structure with lower molecular ordering that impedes hopping of charge carriers (polarons) within and between the polymer chains [32,33].…”

Section: Mechanisms For the Improved Electrical Conductivity Of Emim:mentioning

confidence: 99%

Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

et al. 2020

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A two-step approach of improving the thermoelectric properties of Poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT:PSS) via the addition of the ionic liquid, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) and subsequent reduction with NaBH4 is presented. The addition of 2.5 v/v% of EMIM:TFSI to PEDOT:PSS increases the electrical conductivity from 3 S·cm−1 to 1439 S·cm−1 at 40 °C. An additional post treatment using the reducing agent, NaBH4, increases the Seebeck coefficient of the film from 11 µV·K−1 to 30 µV·K−1 at 40 °C. The combined treatment gives an overall improvement in power factor increase from 0.04 µW·m−1·K−2 to 33 µW·m−1·K−2 below 140 °C. Raman and XPS measurements show that the increase in PEDOT:PSS conductivity is due to PSS separation from PEDOT and a conformational change of the PEDOT chains from the benzoid to quinoid molecular orientation. The improved Seebeck coefficient is due to a reduction of charge carriers which is evidenced from the UV–VIS depicting the emergence of polarons.

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“…The most significant utilization of this instrumental technique was in determining the Raman red shift at 1440 cm -1 which indicates the benzoid to quinoid conformational change in PEDOT chains. [298][299][300] The spectra were run from 300 nm to 1900 nm. The Raman spectra were measured using a Renishaw inVia Raman system.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Improvement to the thermoelectric properties of PEDOT:PSS

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Thermoelectric materials can convert waste heat to electricity without moving parts. Extensive research into improving the efficiency of inorganic thermoelectric materials has allowed some materials such as bismuth tellurides to be commercialized. These materials, however, contain materials in low abundance on earth such as tellurium therefore their use and scaled production would be limited. Organic and hybrid thermoelectric materials can meet the gap for niche markets as well as be synthesized on mass, due to utilization of earth abundant elements such as carbon, sulphur, and nitrogen. The thermoelectric generators require several n and p-type materials connected for optimal efficiency. There are many ways to create inorganic thermoelectric n and p-types. However, for the organic thermoelectric materials the efficiency lags because of their lower electrical conductivity and Seebeck coefficient as well as the lack of effective strategies in the development of n-type materials. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most successful and researched p-type organic thermoelectric material and thus, the thesis will explore effective strategies for decoupling the apparent trade-offs observed when improving either the electrical conductivity or Seebeck coefficient. The first major contribution to knowledge discussed in this study is the utilization of a reducing agent treatment on PEDOT-ionic liquid composites (reader is advised to refer to chapter 5). Another significant finding was the successful development of a novel route to an n-type single walled carbon nanotube, PEDOT:PSS composite (please refer to chapter 6). The final and most significant contribution to knowledge in this research project was the development of a set of novel single walled carbon nanotube, ionic liquid, PEDOT:PSS composites whereby after a post treatment with a guanidinium iodide in ethylene glycol solution allowed for improvement of the electrical conductivity from 3.4 S cm -1 to 3665 S cm-1 and Seebeck coefficient from 12 μV K-1 to 27 μV K-1 thereby leading to an optimised power factor of 236 μW m-1 K-1 at 140 °C (please refer to chapter 7).

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On the mechanism of conductivity enhancement in PEDOT:PSS/PVA blend fiber induced by UV-light irradiation

Cited by 19 publications

References 26 publications

Consequences of gamma-ray irradiation on structural and electronic properties of PEDOT:PSS polymer in air and vacuum environments

Consequences of gamma-ray irradiation on structural and electronic properties of PEDOT:PSS polymer in air and vacuum environments

Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

Improvement to the thermoelectric properties of PEDOT:PSS

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