Home  About us  Contact
 

Conjugated Polymer (conjugate + polymer)

Distribution by Scientific Domains
Polymers and Materials Science75%

Selected Abstracts

Analyte-Induced Aggregation of a Water-Soluble Conjugated Polymer for Fluorescent Assay of Oxalic Acid

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 18-19 2007
Huan Sun
Abstract An assay method has been developed to detect oxalic acid from other structurally similar dicarboxylic acids using a cationic polythiophene derivative (PFT). Upon adding oxalic acid, the PFT can be cross-linked through the bifunctional diacids of oxalic acid to form tense interpolymer , -stacking aggregation, which results in the fluorescence self-quenching of the PFT. Upon adding other dicarboxylic acids with a longer tether, loose interpolymer , -stacking aggregation forms and the PFT fluorescence is less quenched. The fluorescence analysis was carried out in solution for the aggregates prior to precipitation. As a result of the short tether of oxalic acid, the unique fluorescent response from the PFT/oxalic acid assembly can be used to detect oxalic acid. [source]

Single-Molecule Spectroscopy on a Ladder-Type Conjugated Polymer: Electron,Phonon Coupling and Spectral Diffusion

CHEMPHYSCHEM, Issue 14 2009
Richard Hildner Dr.
Abstract We employ low-temperature single-molecule spectroscopy combined with pattern recognition techniques for data analysis on a methyl-substituted ladder-type poly(para -phenylene) (MeLPPP) to investigate the electron,phonon coupling to low-energy vibrational modes as well as the origin of the strong spectral diffusion processes observed for this conjugated polymer. The results indicate weak electron,phonon coupling to low-frequency vibrations of the surrounding matrix of the chromophores, and that low-energy intrachain vibrations of the conjugated backbone do not couple to the electronic transitions of MeLPPP at low temperatures. Furthermore, these findings suggest that the main line-broadening mechanism of the zero-phonon lines of MeLPPP is fast, unresolved spectral diffusion, which arises from conformational fluctuations of the side groups attached to the MeLPPP backbone as well as of the surrounding host material. [source]

High Mobility Ambipolar Charge Transport in Polyselenophene Conjugated Polymers

ADVANCED MATERIALS, Issue 21 2010
Zhuoying Chen
High mobility ambipolor polymer field-effect transistors based on a series of regioregular polyselenophenes are presented together with their morphological and optical properties. Balanced electron and hole mobilities on the order of 0.03,cm2,V,1,s,1 are observed by employing a simple top-gate/bottom-contact configuration with photolithographically defined gold source/drain contacts. High gain complementary-like voltage inverters are demonstrated based on two identical ambipolar transistors. [source]

Optical Detection of Mercury(II) in Aqueous Solutions by Using Conjugated Polymers and Label-Free Oligonucleotides,

ADVANCED MATERIALS, Issue 11 2007
X. Liu
A conjugated-polymer-based "mix-and-detect" optical sensor for mercury ions is fabricated by using a water-soluble poly[3-(3,- N,N,N -triethylamino-1,-propyloxy)-4-methyl-2,5-thiophene hydrochloride] (PMNT) and a label-free, mercury-specific oligonucleotide (MSO) probe. PMNT binds to the Hg2+ -free MSO and the Hg2+,MSO complex in different ways, and exhibits distinguishable and specific optical responses to the target-induced conformation change. [source]