نتایج جستجو برای: polythiophene

تعداد نتایج: 567  

Journal: :Open Journal of Polymer Chemistry 2013

2009
Precious Cantu Takahiro Nishijima Hidekazu Shimotani Yoshihiro Iwasa

Carrier density is one of the most important parameters in changing the electronic properties of materials. The most useful and conventional way to control the carrier density is chemical syntheses. On the other hand, physicists and electronic engineers have developed a field effect transistor (FET) device for changing the carrier density by electric fields. Furthermore, by introducing a liquid...

1999
J. T. Lopez Navarrete G. Zerbi

The vibrational dynamics of oligomers of thiophene is treated theoretically and the experimental infrared and Raman spectra are studied with the main purpose to derive information for the interpretation of the spectra of polythiophene. The optimized geometries and the vibrational force field are calculated for the oligomers Th, (n = 1, 2, 3,4, and 6) and the parameters are used for PTh. For PTh...

2006
Anthony J. Miller Ross A. Hatton Ravi P. Silva

A water-soluble acid oxidized multiwall carbon nanotube o-MWCNTs -polythiophene composite for bilayer photovoltaics is reported. Discrete heterojunction photovoltaic cells utilizing this nanocomposite material as the donor layer exhibit a 20% increase in fill factor and commensurate increase in power conversion efficiency as compared to cells without o-MWCNTs. Crucially o-MWCNTs are incorporate...

Journal: :Nanoscale 2016
Liang Guo Jiechao Ge Weimin Liu Guangle Niu Qingyan Jia Hui Wang Pengfei Wang

Various functional precursors based on polythiophene derivatives are designed to prepare carbon dots (C-dots) with tunable emissions ranging from blue to near-infrared (NIR) at a single excitation wavelength (400 nm). The as-prepared C-dots demonstrate homogeneous size, superior optical properties, excellent water solubility, and low cytotoxicity. Thus, the C-dots are candidates for bio-imaging...

Journal: :Journal of the American Chemical Society 2004
Dmitry Aldakov Pavel Anzenbacher

A new approach to sensing of aqueous phosphate-related anions based on chromogenic conductive polymers is demonstrated. This method utilizes synergy between low-level p-doping in a polythiophene polymer and hydrogen bonding to increase anion-sensor affinity. These chromogenic conductive polymers show anion-specific changes both in color and in conductivity upon increasing concentration of anion...

Journal: :The journal of physical chemistry letters 2015
Gaël Reecht Hervé Bulou Fabrice Scheurer Virginie Speisser Fabrice Mathevet César González Yannick J Dappe Guillaume Schull

A scanning tunnelling microscope is used to pull a polythiophene wire from a Au(111) surface while measuring the current traversing the junction. Abrupt current increases measured during the lifting procedure are associated with the detachment of molecular subunits, in apparent contradiction with the expected exponential decrease of the conductance with wire length. Ab initio simulations reprod...

Journal: :Nature materials 2003
K Peter R Nilsson Olle Inganäs

Electronic polymers in aqueous media may offer bioelectronic detection of biospecific interactions. Here we report a fluorometric DNA hybridization detection method based on non-covalent coupling of DNA to a water-soluble zwitterionic polythiophene derivative. Introduction of a single-stranded oligonucleotide will induce a planar polymer and aggregation of the polymer chains, detected as a decr...

Journal: :Macromolecules 2022

Insulated polythiophenes with a polyrotaxane-like 3D architecture have shown excellent intrawire hole mobility, allowing their use in interesting optoelectronic applications. This is due to the isolation of ?-conjugated backbones that warrants for stabilization quasi-planar conformation polythiophene core and prevents electronic communication between adjacent chains. Thus, polythiophene-based i...

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