Conjugated polymers as Langmuir and Langmuir-Blodgett films: Challenges and applications in nanostructured devices

Rodrigues, Rebeca da Rocha; Silva, Rafael Leonardo Cruz Gomes da; Caseli, Luciano; Péres, Laura O.

doi:10.1016/j.cis.2020.102277

Cited by 32 publications

(25 citation statements)

References 142 publications

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“…Similar data was reported by Maestro et al They concluded that layer thickening involves the existence of entanglements and diffusion "reptation motions", which control molecular transport inside the monolayer. 36,38 Thus, our results provide supporting evidence of the capability of this method to prepare thin films of a specific thickness directly at the air−water interface. LB thin films were also characterized according to their wettability by contact angle.…”

Section: Characterization Of Monolayersupporting

confidence: 74%

“…For amphiphilic molecules, the physical trough area is by definition referred to as the “area per molecule”; however, when nanomaterials are deposited on a surface, their size and shape polydispersity make the meaningful determination (even definition) of an area per molecule difficult. Therefore, in this case, the area is considered as an arbitrary value which cannot be compared through different experimental setups .…”

Section: Results and Discussionmentioning

confidence: 99%

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On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

et al. 2022

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Characterization of bidimensional polymeric films at the air−water interface in the Langmuir trough, despite being a recurrent topic, usually refers to films of already formed polymeric materials, with very scarce reports on direct polymerization at the air−water interface. In the present work, we studied the photopolymerization of stearyl methacrylate directly at the air−water interface under a nitrogen atmosphere, with the radical initiator solubilized in the aqueous phase. Two-dimensional (2D) polymerization was monitored by measuring the pressure−area isotherm at different irradiation times. The polymerization leads to a film with an isotherm different from that observed for the monomer, where the surface pressure is directly related to the irradiation time. The shape of this isotherm confirms the presence of a compressed liquid phase, where a higher order can be attained as a consequence of stronger packing forces involving polymer chains. The presence of inter-chain interactions allows rearrangements on the surface of the subphase, and even before the collapse a dense 2D ordering (with a solid phase-like behavior) can be observed. We present a new one-step, solvent-free procedure to obtain a photopolymeric film directly at the air−water interface, which can be transferred to a solid surface by the Langmuir−Blodgett method, allowing film preparation of controlled thickness. Films were characterized by measuring properties such as thickness, roughness, and hydrophobicity and comparing them with films obtained from a conventional polymer. We report the differences between the interfacial behavior of amphiphilic molecules and nanomaterials such as films obtained by photo-polymerization, PSMA, directly on the air−water interface.

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Section: Characterization Of Monolayersupporting

confidence: 74%

Section: Results and Discussionmentioning

confidence: 99%

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

et al. 2022

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“…The conclusions drawn from the photophysical investigations are further supported by the analysis of Langmuir monolayers at the water–air interface. The Langmuir technique has attracted much interest for the construction of various nanostructures and is usually used to obtain various highly organized molecular films. − The surface pressure versus film area, also known as the isotherm (π– A ) curve, was recorded during every compression cycle and provided basic knowledge on the monolayer formation. Thus Langmuir monolayers were formed from dilute DCM solutions of PF·TMS·β-CD , PF·TMS·γ-CD , and PF and investigated using the compression isotherms.…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis, Photophysics, and Langmuir Films of Polyfluorene/Permodified Cyclodextrin Polyrotaxanes

Haitami

Resmeriță²,

Fichet

et al. 2021

Langmuir

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In the present study, we investigated the effect of permodified 2,3,6-tri-O-trimethylsilyl β- and γ-cyclodextrin (TMS·β-CD, TMS·γ-CD) encapsulation on the optical, electrochemical, morphological, and supramolecular arrangements of a poly[2,7′-(9,9-dioctylfluorene-alt-2′,7-fluorene)] PF copolymer. For this purpose, the photophysical properties and Langmuir monolayer formation of PF·TMS·β-CD and PF·TMS·γ-CD polyrotaxanes were investigated and compared with those of the reference PF. Surface pressure–area isotherms and Brewster angle microscopy studies indicated the capability of both polyrotaxanes to organize into larger and homogeneous 2D supramolecular assemblies at the air–water interface. The obtained results suggest that the presence of the surrounding TMS·β-CD and TMS·γ-CD macrocycles on the PF backbones leads to changes in the conformation and hydrophobicity of the film surfaces. Our investigation offers a method to assess the impact of TMS-CD encapsulation on the control of 2D monolayer formation, with particular attention on the generation of stable PF monolayers for organic electronic devices.

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“…Nanomaterials, together with tools of surface modification, represent promising approaches for ensuring specific chemical and physical properties that can extend the range of applicability of polymer materials. There are a wide variety of surface modification techniques, such as physical and chemical deposition of the thin layer [ 9 , 10 ], ion implantation [ 11 ], Langmuir-Blodgett coating [ 12 ], or plasma [ 13 ] and laser treatment [ 14 , 15 ], which influence surface topography, chemistry, and wettability. Laser treatment is a very effective method to modify the surface of polymers [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Engineered Cu-PEN Composites at the Nanoscale: Preparation and Characterisation

et al. 2022

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As polymeric materials are already used in many industries, the range of their applications is constantly expanding. Therefore, their preparation procedures and the resulting properties require considerable attention. In this work, we designed the surface of polyethylene naphthalate (PEN) introducing copper nanowires. The surface of PEN was transformed into coherent ripple patterns by treatment with a KrF excimer laser. Then, Cu deposition onto nanostructured surfaces by a vacuum evaporation technique was accomplished, giving rise to nanowires. The morphology of the prepared structures was investigated by atomic force microscopy and scanning electron microscopy. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy revealed the distribution of Cu in the nanowires and their gradual oxidation. The optical properties of the Cu nanowires were measured by UV-Vis spectroscopy. The sessile drop method revealed the hydrophobic character of the Cu/PEN surface, which is important for further studies of biological responses. Our study suggests that a combination of laser surface texturing and vacuum evaporation can be an effective and simple method for the preparation of a Cu/polymer nanocomposite with potential exploitation in bioapplications; however, it should be borne in mind that significant post-deposition oxidation of the Cu nanowire occurs, which may open up new strategies for further biological applications.

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Conjugated polymers as Langmuir and Langmuir-Blodgett films: Challenges and applications in nanostructured devices

Cited by 32 publications

References 142 publications

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

Synthesis, Photophysics, and Langmuir Films of Polyfluorene/Permodified Cyclodextrin Polyrotaxanes

Engineered Cu-PEN Composites at the Nanoscale: Preparation and Characterisation

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