Fabrication of Polymer Langmuir−Blodgett Films Containing Regioregular Poly(3-hexylthiophene) for Application to Field-Effect Transistor

Matsui, Jun; Yoshida, Soh; Mikayama, Takeshi; Aoki, and Atsushi; Miyashita, Tokujı

doi:10.1021/la046922n

Cited by 58 publications

(54 citation statements)

References 31 publications

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“…We have tried to fabricate PHT LB film using pDDA nanosheet. 81 A mixture of RR-PHT and pDDA at various mixture ratios were spread onto the water surface to discuss the formation of those monolayer properties. Spreading a chloroform solution containing a pDDA/ RR-PHT mixture onto the water surface results in formation of a uniform mixed polymer nano-sheet.…”

Section: Fabrication Of -Conjugated Polymer Nano-sheetmentioning

confidence: 99%

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Mitsuishi

Matsui

Miyashita

2006

Polym J

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ABSTRACT:This review describes recent topics on functional organized molecular assemblies based on ''polymer nano-sheet''. Polymer nano-sheets consisting of amphiphilic poly(alkylacrylamide)s are described as ultrathin polymer Langmuir-Blodgett films through two-dimensional hydrogen networks between polymer backbones, which have been developed to assemble various functional molecules and nanomaterials such as metal and magnetic nanoparticles. Surface modification and nanocoating using fluorinated polymer nano-sheets in confined area are given. Multicolored patterns based on structured color and photopatterning derived from nanostructures are demonstrated. The scope of polymer nano-sheets concerning the bottom-up soft nanodevice is also reviewed. [doi:10.1295/polymj.PJ2006069] KEY WORDS Polymer / Langmuir-Blodgett / Nano-sheet / Thin Film / Acrylamide / Bottom-up approaches for constructing ordered nanoscale structures in organic molecular assemblies are of interest and various techniques for preparation of organic ultrathin films have been extensively studied. Organic thin films are attractive materials for processability, ease of functionalization, light weight, and flexibility. However processing technology on a nanoscale is immature and continuous development is required. Various organic films, for example, a spincoated film, self-assembled monolayers (SAM), 1 polymer brushes, and layer-by-layer alternative adsorption via electrostatic interactions, 2 have been investigated. We have tried to prepare various polymer ultrathin films with the Langmuir-Blodgett (LB) technique. [3][4][5][6] It has been found that N-alkylacrylamide polymer shows highly oriented and well ordered monolayer at the air/water interface. Two-dimensional network of the polymer chains via hydrogen bonding interaction of amide groups on the water surface gives a stable and condensed polymer monolayer (Figure 1). A wide variety of functional molecules were incorporated in the monolayer through copolymerization method 7 and polyion complex method etc. The advantages of the polymer nano-sheet are (1) thermal and mechanical stability, (2) uniform distribution of functional molecules, and (3) ultrathin films at the nanometer scale ranged from 1.0 nm to 2.0 nm and (4) versatile molecular building blocks. Various functional polymer nano-sheets allow fabrication of soft nanodevices based on their integrated assemblies. This review shows the definition and fascinating features of polymer nano-sheets at the first session and describes recent topics of polymer nanoarchitecture based on polymer nano-sheets; fluorination of polymer nanosheets, structured color by three-dimensional nanoassemblies, conductive polymer nano-sheets and molecular logic gates driven by photo-excitation. Hybrid nanomaterials consisting of polymer nano-sheets and metal nanoparticles are also demonstrated for efficient localized surface plasmon resonance utilization. POLYMER NANO-SHEETS BY LANGMUIR-BLODGETT TECHNIQUEThe Langmuir-Blodgett (LB) technique is a powerful means for pre...

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Section: Fabrication Of -Conjugated Polymer Nano-sheetmentioning

confidence: 99%

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Mitsuishi

Matsui

Miyashita

2006

Polym J

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“…Those films have rather high spontaneous polarization and are utilized as piezo-transducers (e.g. in microphones) and pyroelectric devices (infrared detectors and image converters) [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A Study on Ferroelectric PVDF Ultrathin Films Prepared by Lb Technique

Jiang

et al. 2007

Integrated Ferroelectrics

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Langmuir-Blodgett (LB) deposition technique of ferroelectric films has been employed to obtain highly ordered monomolecular films with densely packed structure for the application of molecule-based electronic devices. The ferroelectric poly (vinylidene fluoride) (PVDF) LB ultrathin films were prepared on a quartz substrate using ultra-pure water as the subphase. The PVDF ultrathin film was characterized by FT-IR spectrum. It shows a weak narrow peak at 510 cm −1 and an intense peak at 840 cm −1 , which are ascribed to β phase of PVDF. The ferroelectric properties have been investigated. The results indicate that the dipoles of PVDF LB ultrathin film have been oriented in the directions of perpendicular to the film surface, while spread on the subphase and compressed with LB technique.

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“…[2][3][4][5][6] This functional polymer is viewed as potentially useful materials in fieldeffect transistors, optical and electronic sensors, light-emitting devices, nonlinear optical materials, etc. [7][8][9] Our attention has focused on colloidal dispersions of P3HT particles. Colloidal particles are of great importance due to their interesting physical properties as well as their potential technological applications.…”

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confidence: 99%

Preparation and Characterization of Water Self-dispersible Poly(3-hexylthiophene) Particles

Shimizu

Yamada

Wada

et al. 2007

Polym J

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The present paper describes the preparation and characterization of stable aqueous dispersions of poly (3-hexylthiophene) (P3HT) by a precipitation method. P3HT was first synthesized by oxidative polymerization of 3HT with iron(III) chloride as an oxidant. Number-average molecular weight (M n ) of P3HT increased with an increase in 3HT concentration. Colloidal particles were prepared by adding a tetrahydrofuran (THF) solution of P3HT into a large amount of distilled water. TEM observations showed that the particle size increased with an increase in the concentration and M n of P3HT. The size of the particles was in the range of 50 to 600 nm. The spectral features of the aqueous dispersions were investigated by means of UV-vis spectroscopy. P3HT provided the -Ã absorption band at 436 nm in THF. On the other hand, the dispersions brought about a bathochromic shift of the bands and a larger red shift was observed as the polymer concentration became higher, indicating that P3HT would take a well-stacked structure in the particles. Temperature dependence of UV-vis absorption spectra for P3HT aqueous dispersions was also studied in the temperature range of 0 to 80 C, which revealed that P3HT in the dispersed state showed a thermochromism similar to that of P3HT in THF.KEY WORDS: Polythiophene / -Conjugated Polymer / Poly(3-hexylthiophene) / Colloidal Particle / Conducting Polymer / Precipitation Method / Thermochromism / Poly(3-hexylthiophene) (P3HT) is a subject of extensive study because of its solubility, fusibility, and environmental stability.1 P3HT also exhibits unique properties such as thermochromism and solvatochromism. [2][3][4][5][6] This functional polymer is viewed as potentially useful materials in fieldeffect transistors, optical and electronic sensors, light-emitting devices, nonlinear optical materials, etc. 7-9Our attention has focused on colloidal dispersions of P3HT particles. Colloidal particles are of great importance due to their interesting physical properties as well as their potential technological applications.10,11 Several attempts have been made so far to produce P3HT particles. Yamamoto et al. employed a reprecipitation method to prepare colloidal dispersions of P3HT. Methanol, which is a poor solvent for P3HT, was added to the CHCl 3 solution of P3HT, resulting in the formation of P3HT particles. 12,13 Takeuchi and Kobashi also investigated in detail the kinds of poor solvents and clarified the precipitation conditions for improved yields. 14 Furthermore, it has been reported that the use of a nonionic surfactant, Tween 80, provided stable aqueous dispersions of P3HT. 15To our knowledge, few reports on water self-dispersible P3HT particles have been published. 15 There is hence a lack of information about colloidal properties of P3HT water dispersions, such as particle size, particle morphology, optical property, etc. Development and characterization of such dispersions are of great significance from an environmental as well as industrial aspect. The purpose of the present study is to de...

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Fabrication of Polymer Langmuir−Blodgett Films Containing Regioregular Poly(3-hexylthiophene) for Application to Field-Effect Transistor

Cited by 58 publications

References 31 publications

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

A Study on Ferroelectric PVDF Ultrathin Films Prepared by Lb Technique

Preparation and Characterization of Water Self-dispersible Poly(3-hexylthiophene) Particles

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