Improving molecular structure in polythiophene thin films by solvent dipping post-treatment

Lee, Jeong Ik; Park, Yeong Don

doi:10.1016/j.matchemphys.2020.122878

Cited by 3 publications

(4 citation statements)

References 36 publications

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“…[6][7][8][9] One of the important factors in the design of the structure of 𝜋-conjugated polymer films is the film preparation method. In this context, changing simple parameters such as the solvent used to prepare a film, [10][11][12] the film preparation protocol, [13,14] and the post-treatment technique [15][16][17][18][19] leads to 𝜋-conjugated polymer films with various structures. Among these methods, because the solvents used to prepare films affect the alignment and aggregation of the polymer main chains both in solution and in the solid state, [20][21][22] changing the solvent is the most straightforward approach to modifying the film structure.…”

Section: Introductionmentioning

confidence: 99%

Ordered‐Structure‐Induced Electrochemical Post‐Functionalization of Poly(3‐(2‐ethylhexyl)thiophene)

Kurioka

Komamura

Shida

et al. 2022

Macro Chemistry & Physics

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The optoelectronic properties of 𝝅-conjugated polymers in the film state are known to be strongly affected by their structure. Inspired by this idea, the ordered-structure-induced electrochemical post-functionalization (ePF) of poly(3-(2-ethylhexyl)thiophene) (P3EHT) films are reported. The structure of P3EHT films can be controlled by changing the solvent used to prepare them. The use of chloroform or chlorobenzene as the solvent results in amorphous P3EHT films, whereas P3EHT films with ordered structures are prepared when tetrahydrofuran is used as the solvent. The amorphous P3EHT films are not electrochemically functionalized. By contrast, ePF of the P3EHT films with an ordered structure is successful. In situ conductance measurements reveals that the successful ePF of the P3EHT films with an ordered structure originates from their greater electrochemical conductivity compared with that of amorphous P3EHT films.

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Section: Introductionmentioning

confidence: 99%

Ordered‐Structure‐Induced Electrochemical Post‐Functionalization of Poly(3‐(2‐ethylhexyl)thiophene)

Kurioka

Komamura

Shida

et al. 2022

Macro Chemistry & Physics

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“…They found the best results for solvents with a moderate solubility parameter difference. 21 Further, it was recently shown that the self-assembly of conjugated poly(3-alkylthiophene) (P3AT) in solution was more complex than initially considered. Conformationally disordered P3AT in a non-planar conformation proceeds to a coplanar selfassembled structure via pre-ordered clusters, an intermediate pre-assembly species composed of solvent/polymer.…”

Section: ■ Introductionmentioning

confidence: 99%

“…and the final morphology is dependent on the method used. − The need to control the self-assembly of conjugated materials has been frequently addressed. − For example, Lee et al showed how the molecular structure and the charge-carrier transport of a polythiophene film are improved by solvent post-treatment. They found the best results for solvents with a moderate solubility parameter difference . Further, it was recently shown that the self-assembly of conjugated poly(3-alkylthiophene) (P3AT) in solution was more complex than initially considered.…”

Section: Introductionmentioning

confidence: 99%

Solvent Role in the Self-Assembly of Poly(3-alkylthiophene): A Harmonic Light Scattering Study

et al. 2021

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s are known to self-assemble into well-ordered supramolecular assemblies. The organization influences the optical and electronic properties of these polymers. One way to induce supramolecular self-assembly is by lowering the solvent quality of solubilized poly(3-alkylthiophene) upon the addition of a non-solvent. Recently, the exact mechanism of the supramolecular self-assembly process has been explored for a chloroform/methanol (solvent/non-solvent) system. However, it is not clear how the solvent influences the supramolecular self-assembly mechanism. In this study, poly(3-alkylthiophene) is dissolved in two different solvents and the supramolecular self-assembly is fully explored by combining harmonic light scattering with electronic spectroscopy. Our results indicate that the actual supramolecular self-assembly is very different in both cases and that the choice of solvent has not only a significant influence on the assembly process but also on the structure of the final supramolecular assembly.

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“…The transfer by vertical deposition is not favored because the regioregular polythiophene causes Langmuir films to have high rigidity, and this characteristic does not allow for transfer of a large number of layers. , In previous work, it was demonstrated that the addition of gold nanoparticles is an excellent way to improve some properties of polythiophene derivatives and the application of these materials in sensor devices. , The main focus in this work was the preparation of LS films containing highly organized P3HT and being soft because of the plasticizing effect of PVDF and poly((vinylidene fluoride)-block-(methyl methacrylate)) (PVDF-PMMA) as well as yielding PVDF in its β phase. This unique combination of properties is intended to lead to better suitability of the P3HT films in several applications based on the optical and electrical responses, mainly in chemical-sensor platforms. − …”

Section: Introductionmentioning

confidence: 99%

Studies of Langmuir and Langmuir–Schaefer Films of Poly(3-Hexylthiophene) and Poly(Vinylidene Fluoride)

et al. 2020

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The synergistic use of blends of regioregular poly(3-hexylthiophene) (P3HT) and poly(vinylidene fluoride) (PVDF) or poly((vinylidene fluoride)-block-(methyl methacrylate)) (PVDF-PMMA) to form Langmuir and Langmuir–Schaefer (LS) films is reported. P3HT has wide applications in sensor devices because of its properties such as conductivity, luminescence, and chromism; however, the stiffness of the films and the difficulty in organizing the molecules may pose a problem in these applications. In this context, polymers based on PVDF can be used in the formation of thin P3HT films and present an alternative to improve the organization of P3HT molecules. In addition, PVDF acts as a plasticizer, making the film less rigid. The films were obtained from the blends of P3HT/PVDF and P3HT/PVDF-PMMA in a solution containing chloroform and DMAc (N,N-dimethylacetamide). Surface pressure isotherms, in situ ultraviolet–visible (UV–vis) spectroscopy, polarization-modulation infrared reflection-absorption spectroscopy, and Brewster angle microscopy techniques were used to analyze Langmuir films. The surface morphology of LS films was characterized by atomic force microscopy and UV–vis spectroscopy, and their degradation was analyzed by UV–vis spectroscopy after exposure to natural light under atmospheric conditions. The Langmuir films containing PVDF indicate a direct formation of the ferroelectric β phase, with dipoles parallel to the water surface. The Langmuir films formed by P3HT presented dipoles of side chains parallel and aromatic groups perpendicular to the water surface. P3HT and PVDF or PVDF-PMMA films show high molecular organization compared with pure P3HT films. The results suggest that these films could be used to improve the properties of P3HT in several device applications, such as in optical and electrical sensors.

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Improving molecular structure in polythiophene thin films by solvent dipping post-treatment

Cited by 3 publications

References 36 publications

Ordered‐Structure‐Induced Electrochemical Post‐Functionalization of Poly(3‐(2‐ethylhexyl)thiophene)

Ordered‐Structure‐Induced Electrochemical Post‐Functionalization of Poly(3‐(2‐ethylhexyl)thiophene)

Solvent Role in the Self-Assembly of Poly(3-alkylthiophene): A Harmonic Light Scattering Study

Studies of Langmuir and Langmuir–Schaefer Films of Poly(3-Hexylthiophene) and Poly(Vinylidene Fluoride)

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