Polymer monolayers and Langmuir–Blodgett films. Polythiophenes

Arslanov, V. V.

doi:10.1070/rc2000v069n10abeh000612

Cited by 21 publications

(9 citation statements)

References 96 publications

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“…Therefore, it was not possible to fabricate good quality LB films of neat P3OT. From the displayed π-A isotherms of the P3OT/SA mixtures, as has already been observed for regioregular P3ATs 14,24 , the mean molecular area increases with the increase of P3OT content, and so does the surface pressure. According to previous reports, SA molecules should have mean molecular area of 22 Å 2,25 at a surface pressure of 50 mN/m.…”

Section: π-A Isothermsmentioning

confidence: 70%

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Poly(3-octylthiophene)/stearic Acid Langmuir and Langmuir-Blodgett films: Preparation and characterization

et al. 2014

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A study is reported on Langmuir and Langmuir-Blodgett (LB) films obtained by adding different percentages of stearic acid (SA) to poly(3-octylhiophene) (P3OT). Surface pressure-mean molecular area (π-A) isotherms, ultraviolet-visible (UV-Vis) absorption spectrum, atomic force microscope (AFM) and dc electrical measurements have been used for characterization. From π-A isotherms, the area per monomer for condensed films (of SA) increased according to P3OT amount. Good transfer ratios were obtained for LB deposition from P3OT/SA films with higher percentage of SA. LB films revealed linear growth as monitored by UV-Vis absorption spectra. Electrical characterization showed higher conductivity for LB film with 54 wt.% of SA. AFM images of the same film revealed high roughness and presence of large size agglomerates. Finally, interdigitated electrodes (IDE) coated with P3OT/SA LB films showed to be sensitive to the presence of volatile organic compounds.

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Section: π-A Isothermsmentioning

confidence: 70%

“…Since polythiophenes exhibit low amphiphilicity, an amphiphilic long chain fatty acid (viz. Stearic Acid, SA) has been used to assist the formation of high quality polythiophene monolayer and multilayer LB films [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Poly(3-octylthiophene)/stearic Acid Langmuir and Langmuir-Blodgett films: Preparation and characterization

et al. 2014

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“…As the materials studied here are not amphiphilic molecules, and therefore will not easily self‐assemble on the underlying water substrate, admixtures with SA were prepared at varying percentages. This technique of employing SA, itself an amphiphilic molecule, improves LB film formation and has been effectively demonstrated elsewhere . A Keithley model 238 SMU (Cleveland, Ohio, USA) was used as the voltage source ( V ) and current meter ( I ) to carry out DC electrical measurements on the LB films over IDE devices.…”

Section: Methodsmentioning

confidence: 99%

Langmuir and Langmuir–Blodgett films of low‐bandgap polymers

Braunger

Silva

Awada

et al. 2018

Polymer International

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Low‐bandgap conjugated polymers have provided a considerable increase in organic photovoltaic efficiencies, however, an understanding of class‐specific nanostructures, necessary to further improve device qualities, remains scarce. Their self‐assembly and associated electronic behaviors in Langmuir−Blodgett (LB) films are used here to provide relationships specific to each polymer, clarifying their structure−property characteristics. The behavior of two low‐bandgap polymers based on cyclopentadithiophene (PCPDTBT) and dithienosilole (Si‐PCPDTBT) units in the Langmuir trough were investigated and it is shown that it is possible to fabricate nanostructured films of low‐bandgap polymers on solid substrates with the LB deposition technique. The polymers were mixed with amphiphilic molecules at well‐defined concentrations to improve the formation of the LB films. The polymers were also deposited by drop‐casting and LB techniques onto interdigitated electrodes to evaluate their electrical properties, and the LB films were characterized for their optical and morphological properties. It was found that both LB and drop‐cast films of PCPDTBT showed higher electrical conductivities than those of Si‐PCPDTBT. Importantly, LB films resulted in higher electrical conductivities – by an order of magnitude − compared to their equivalent mixtures with stearic acid in drop‐cast films, although drop‐cast films without stearic acid gave higher conductivities. This fine‐tuning of the molecular architectures of the films is thus demonstrated to directly affect the physical properties and may lead to an improvement in device efficiencies in future applications. © 2018 Society of Chemical Industry

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“…Preparation and investigation of the ultrathin films based on photosensitive crown-ether derivatives (PCEDs) are currently one of the fascinating and rapidly growing fields of research at the "junction" of polymers and colloids, physical-organic and biological chemistry, bioand nanotechnology [1][2][3][4][5][6][7][8][9][10][11][12]. Such membrane nanostructures can be considered as important model systems and materials widely used to simulate the structure and functions of biological membranes [2,[10][11][12]: monomolecular layers (monolayers) and Langmuir-Blodgett (LB) films [4][5][6][7][12][13][14][15][16], planar bilayer lipid membranes [2,[11][12][13], and spherical bi-and multilayer membranes (vesicles, liposomes, and their analogs) [5,6,[11][12][13][14]16].…”

Section: Introductionmentioning

confidence: 99%

“…Such membrane nanostructures can be considered as important model systems and materials widely used to simulate the structure and functions of biological membranes [2,[10][11][12]: monomolecular layers (monolayers) and Langmuir-Blodgett (LB) films [4][5][6][7][12][13][14][15][16], planar bilayer lipid membranes [2,[11][12][13], and spherical bi-and multilayer membranes (vesicles, liposomes, and their analogs) [5,6,[11][12][13][14]16]. The principal shortcoming of such systems is their low stability, making them distinct from natural membranes stabilized by the electrostatic and hydrophobic interactions between integral and peripheral proteins, peptides, and glycolipids [5][6][7][8][9]12,16]. One of the first and most successful approaches to solve the problem of producing membrane nanosystems was achieved by the manufacture of polymer monolayers and liposomes on the basis of surface active monomers (SAMs) described by Fendler [5], Bader and coworkers [6].…”

Section: Introductionmentioning

confidence: 99%