Langmuir–Blodgett–Kuhn Multilayer Assemblies: Past, Present, and Future of the LB Technology

Balogh, Débora Terezia; Ferreira, Marystela; Oliveira, Osvaldo N.

doi:10.1002/9783527638482.ch4

Cited by 6 publications

(5 citation statements)

References 179 publications

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“…Electroactive thin films represent a crucial element in the construction of devices devoted to energy conversion, actuators, responsive materials, molecular electronics, and clinical diagnostics, among others [1][2][3][4][5][6][7][8]. In such interfaces, the precise control of the molecular components is of fundamental importance for the achievement of novel or optimized functional properties where the vectorial transfer of electrons or ions is required [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Mass and charge transport in highly mesostructured polyelectrolyte/electroactive-surfactant multilayer films

Piccinini

González

Azzaroni

et al. 2021

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Mass and charge transport in highly mesostructured polyelectrolyte/electroactive-surfactant multilayer films

Piccinini

González

Azzaroni

et al. 2021

Journal of Colloid and Interface Science

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“…The hybrid materials from polythiophene derivatives and gold nanoparticles, synthesized in our study, were used for the fabrication of Langmuir films, which are ultrathin films formed on a liquid–air interface. For amphiphilic molecules of low molecular weight, such as fatty acids, this film forming technique provides monolayers with a high degree of control of molecular architecture . For polymers, this control is not straightforward, but films with anisotropic properties, such as polarized light emission, can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…For amphiphilic molecules of low molecular weight, such as fatty acids, this film forming technique provides monolayers with a high degree of control of molecular architecture. 26 For polymers, this control is not straightforward, but films with anisotropic properties, such as polarized light emission, 27 can be obtained. The Langmuir films can be transferred to solid substrates through horizontal deposition, called the Langmuir−Schaefer (LS) method, 28−32 and the molecular arrangements provided at the air−water interface can be preserved.…”

Section: ■ Introductionmentioning

confidence: 99%

Langmuir and Langmuir–Schaefer Films of Poly(3-hexylthiophene) with Gold Nanoparticles and Gold Nanoparticles Capped with 1-Octadecanethiol

Sanfelice¹,

Gonçalves²,

Balogh³

2014

J. Phys. Chem. C

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This paper reports on the production of Langmuir films of regioregular poly(3-hexylthiophene) (P3HT) and their characterization by surface pressure isotherms and UV−vis in situ spectroscopy aiming at the best spreading conditions. Hybrid films containing the polymer and gold nanoparticles were obtained through the use of the optimized parameters for neat P3HT. Two types of hybrid films with P3HT and gold nanoparticles were studied. In the first type, gold nanoparticles in an aqueous solution were used in a subphase of a Langmuir trough and the polymer spread on the air/water interface. In the second type, 1-octadecanethiol capped gold nanoparticles (AuNpOctathiol) were used in a mixture with P3HT in chloroform and spread on the air−water interface. The Langmuir films were transferred to several solid substrates by the Langmuir−Schaefer (LS) method. The surface morphology was characterized by Scanning Electron Microscopy with Field Emission Guns (SEM-FEG), and the presence of gold nanoparticles in the films was confirmed. The growth of the layers in the films was monitored by transmission UV−vis spectroscopy, and the existence of optical anisotropy was investigated by polarized UV−vis spectroscopy. The results imply that the polymer backbone adopts a preferential orientation during the compression, which has a strong component parallel to the trough barrier, and is influenced by the presence of the nanoparticles in the films. The photostability of the films was studied by their exposition to a white light, and the hybrid films formed with P3HT and AuNpOctathiol showed an increase in the photostability, in comparison to the neat P3HT. Such an increase indicates that somehow the AuNpOctathiol molecules provide some protection against the photodegradation of P3HT.

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“…Langmuir films are ultrafine films with a thickness that can reach a monolayer, formed at the air–liquid interface. They can also present a high degree of control over molecular arrangement. − This method can be used to study polymeric blends because it allows the analysis of the organization and behavior of the two components in the presence of each other. Langmuir films can be transferred to solid substrates by vertical deposition (Langmuir–Blodgett films) or by horizontal deposition (LS films), preserving the molecular arrangements formed at the air–water interface .…”

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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Langmuir–Blodgett–Kuhn Multilayer Assemblies: Past, Present, and Future of the LB Technology

Cited by 6 publications

References 179 publications

Mass and charge transport in highly mesostructured polyelectrolyte/electroactive-surfactant multilayer films

Mass and charge transport in highly mesostructured polyelectrolyte/electroactive-surfactant multilayer films

Langmuir and Langmuir–Schaefer Films of Poly(3-hexylthiophene) with Gold Nanoparticles and Gold Nanoparticles Capped with 1-Octadecanethiol

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

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