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Showing 1 to 20 of 37 for “"Polythiophene"”.
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Polythiophene als sensitive Filme in chemischen Sensoren
This work deals with the sensor application of polythiophenes, which belong to the group of the conducting polymers. The first part focuses on sensor application of poly(3,4-ethylenedioxythiophene) (PEDOT) for ion detection in aqueous electrolytes. The advanced electrochemical quartz crystal …
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DNA Origami-Templated Synthesis of Semiconducting Polythiophene Filaments
Die Herstellung funktionaler und strukturell wohldefinierter Nanostrukturen ist eine Voraussetzung, um hochentwickelte Device im Bereich der Nanoelektronik oder Nanooptik zu entwickeln. Bottom-Up-Verfahren, welche auf biomolekularen Selbstassemblierungsprozessen basieren, haben sich hierfür, …
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Surfactant Formulations for Water-Based Processing of a Polythiophene Derivative
… Transitions in the backbone conformation of polythiophenes (PT) in organic solvents have been widely observed to influence thin-film morphology. However, conformational transitions of water-soluble PT derivatives, with respect to their intramolecular versus intermolecular origin, remain …
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Electrical characterization of organic devices: case study: polythiophene-fullerene based solar cells
Polymer based solar cells were fabricated by using Poly(3-hexylthiophene-2.5diyl)(P3HT) as a donor, combined with the fullerene derivative [6,6]-phenyl -C61 butyric acid methyl ester, (PCBM) as an acceptor, in a bulk heterojunction structure. Electrical and optical properties of these organic …
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Role of polythiophene- based interlayers from electrochemical processes on organic light-emitting diodes
… well-defined and stable thin films based on polythiophene and its derivative, are employed as the hole-injection contact of organic light-emitting diodes (OLED). The polymer films are obtained by the electropolymerization or the electrochemical doping/dedoping of a spin-coated layer. Their …
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Morphology and Conformation of Polythiophene Derivatives in Anisotropic Core-Shell Nanocomposites and Solution
… oxide nanowires and a side-chain functionalized polythiophene is reported. This nanocomposite exhibits confirmed covalent side-on linkage between the polymer and the nanowires, and the crystalline, thermal and photophysical properties of the nanocomposite are investigated, revealing elongated …
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Synthesis and characterization of conducting polymers with new architectural motifs
Chapter one has a brief discussion of polythiophene and the important factors to consider with polythiophene synthesis and characterization. In chapter two, a variety of polythiophene derivatives that incorporated 2,2'-biphenyl units into the polymer main chain were synthesized. The potential …
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Chiral Polymer Photodetector
A polymer photodetector is fabricated using polythiophene with chiral alkyl side chains. The Cotton effect is observed in the CD spectrum of the photodetector, indicating an unequal absorbance of left- and right-handed circular polarized light (CPL). The photodetector is proven to be able to …
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Synthesis and characterization of conducting polymer nanostructures and their application in sensors
… method was carried out to synthesize polythiophene nanofibers. In this approach, a solution of thiophene, FeCl₃, and terthiophene was dissolved in acetonitrile. Compared to conventional chemical polymerization, a polythiophene oligomer, terthiophene or bithiophene, was added to assist …
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Polymer and carbon nanotube materials for chemical sensors and organic electronics
… and hexafluoroisopropanol (HFIP) functionalized polythiophene, with a largely simplified fabrication process. The sensor shows high sensitivity and selectivity for a nerve reagent stimulant. A series of mechanistic studies indicate that the sensing response occurs via charge transfer, the …
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The synthesis, characterization, and application of carborane-cluster based macrocycles and boron nitride nanosheets in photovoltaics
… of boron nitride nanosheets (BNNS) with polythiophene can produce a working photovoltaic device when attached to TiO2 nanoparticles as a semiconductor in a manner similar to a DSSC. This paper explores the characterizations of a new polythiophene-BNNS complex, as well as attempting to …
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Thermal and photochemical reactions of large metallaborane clusters and functionalizations of boron nitride nanosheets
… nanosheets (BNNSs) has been achieved by using polythiophene or polyvinylpyrrolidone as a functionalization polymer with BNNSs. The BNNSs form strong π-π stacking interactions with the polythiophenes and were found to act as a bandgap tuning tool for polythiophene derivatives. A …
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Thin Films of Semiconducting Polymers and Block Copolymers by Surface-initiated Polymerization
… Ni(II) external catalytic initiator to prepare polythiophene (PT) thin films. We provided evidence that the surface-initiated polymerization occurs by the highly robust controlled (quasi-“living”) chain-growth mechanism. Extensive structural studies of the resulting thin films revealed detailed …
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Molecular Design and Structural Optimization of Nanocellulose-Based Functional Films
… and electrically conductive nanocellulose-based polythiophene nanofilms were fabricated. The results reveal that cellulose nanofibers changed their nature from insulator to semiconductor. Finally, regioselective functionalization of NFC was conducted to investigate whether precise control of the …
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A conjugated polymer plastic gel
… a strong and stable dipolar group, to the polythiophene backbone enhances the solubility and especially, the hydrogen bond forming capabilities of the polymer. This functionalization enables the polymer to build up an isotropic self-supporting network structure based on a combination of …
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Charge Transport Physics of Organic Semiconductors at High Carrier Densities
… on diketopyrrolopyrrole-based donor-acceptor and polythiophene-based pure-donor systems. Through systematic studies of the three polymer systems, we describe how distinctions in their electronic structures and microstructures are reflected in the details of their transport signatures. The apparent …
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Functional surface-initiated polymers: Device applications and polymerization techniques
… growth of highly conjugated surface grafted polythiophene layers. Thick polythiophene layers are obtained, that are low in roughness and show photoluminescence and polychromism upon doping. The second part (chapter 5 and 6) of this thesis presents new techniques for surface polymerizations. …
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Synthesis and Characterization of Some Rhenium Complexes
… focused on heterocylic aromatic polymers such as polythiophene and polypyrrole, in efforts to produce conductive polymers that are air-stable, tractable, and have a low band gap. The lone-pair electrons of the sulfur and nitrogen atoms tend to stabilize the positive charges of the p-doped polymers …
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Metal oxide electrocatalysts for alternative energy technologies
… polymers, such as polypyrrole (PPy), and polythiophene (PTh), are often incorporated into actuators, sensors, and energy storage devices such as supercapacitors. The mechanism of the actuation in these polymers due to the insertion/removal of ions was studied. Electrochemical quartz …
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Synthesis of Conjugated Polymers
… transfer.Next, a ketone group was introduced to polythiophene to lower its LUMO level and increase the electron affinity. Regioregular poly(3-heptanoylthiophene) (PHOT) was synthesized. The polymerization was realized by Ni-catalyzed Kumada coupling with a chain-growth mechanism. Schlenk …
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