Electroluminescent Polyelectrolyte−Surfactant Complexes

Thünemann, Andreas F.; Ruppelt, Dirk

doi:10.1021/la010519o

Cited by 57 publications

(76 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nano-sized TiO 2 powder has been used to increase the contact area between TiO 2 and carbon, leading to a considerably lower reaction temperature. [11] This report describes the use of cellulose structures as the carbon precursor and aqueous-based Tyzor-LA as the TiO 2 source for the synthesis of TiC nanoparticles by carbothermal reduction in Ar. The hierarchical cellulose structures resident in the filter paper were completely maintained even after treatment at high temperature.…”

Section: Methodsmentioning

confidence: 99%

Solvent‐Induced Self‐Assembly of a Meta‐Linked Conjugated Polyelectrolyte. Helix Formation, Guest Intercalation, and Amplified Quenching

et al. 2004

View full text Add to dashboard Cite

It is well established that amphiphilic polymers self-assemble into a variety of supramolecular architectures, including micelles, vesicles, and liquid-crystalline phases. [1,2] Recent interest in the self-assembly of functional materials has motivated a number of research groups to investigate the properties of amphiphilic p-conjugated oligomers and polymers.[3±5]These studies reveal that self-assembly can give rise to unique materials properties such as changes in light absorption (color), fluorescence wavelength and fluorescence anisotropy, and induction of large amplitude circular dichroism signals. [3,4,6] It has also been demonstrated that there is a direct relationship between architecture at the molecular and supramolecular levels. For example, molecular systems featuring large planar aromatic cores with protruding flexible alkyl chains self-assemble into discotic liquid-crystalline phases; [7±9] linear p-conjugated systems consisting of poly(phenylene vinylene) (PPV) or poly(phenylene ethynylene) (PPE) backbones with flexible alkyl or alkyloxy side chains form lamellar aggregates; [10±13] conjugated oligomers and polymers with kinked or bent, but otherwise rigid, backbones may self-assemble into helical structures. [6,14±20] We have an ongoing interest in the optical and self-assembly properties of water-soluble conjugated polyelectrolytes (CPEs).[21±23] The CPE systems that have been of particular interest in our work are para-linked (linear-chain) PPE-type polymers, which feature ionic side groups that are tethered to the conjugated backbone by relatively short alkoxy chains. [21,23] These linear PPEs absorb and fluoresce strongly in the visible region, and on the basis of the study of solvent effects on the spectroscopic properties we conclude that the materials exist as ªmolecularly dissolvedº chains in MeOH (a ªgoodº solvent) and they self-assemble into p-stacked aggregates in water (a ªpoorº solvent). Aggregation of the para-PPEs in water is believed to arise due to the hydrophobic effect and favorable p±p interactions between phenylene units in the aggregated chains. [21,23] Our interest in the PPEtype CPEs is motivated in part due to the fact that they exhibit a remarkable property of having their fluorescence quenched by ultra-low concentrations of oppositely charged quencher ions. [21,24±28] This effect, which has been termed ªamplified quenchingº, [29] is believed to arise due to ion-pair formation between the charged quencher and the CPE chain and the ability of the exciton to diffuse rapidly along a CPE chain. [21,24±30] The amplified quenching effect has attracted considerable interest, since it allows CPEs to be used as a platform for highly sensitive detection of biologically relevant targets such as proteins, nucleic acids, and enzymes. [24,28,31±36] In a series of clever studies, Moore and co-workers demonstrated that meta-linked oligo(m-phenylene ethynylene)s (OPEs) that are substituted with oligo(ethyleneoxy) side chains self-assemble into a helical conformation in a poor...

show abstract

Section: Methodsmentioning

confidence: 99%

Solvent‐Induced Self‐Assembly of a Meta‐Linked Conjugated Polyelectrolyte. Helix Formation, Guest Intercalation, and Amplified Quenching

et al. 2004

View full text Add to dashboard Cite

show abstract

“…[39,56,[59][60][61] Such modifications may lead to interesting nanostructures in the solid state. [20,62] …”

Section: Reviewmentioning

confidence: 98%

“…[20,62] Surfactants were used to replace Na þ counterions and to reduce the brittle aspects of the films. Device fabrication involved casting P12 atop ITO and deposition of Al (ITO/P12/ Al).…”

Section: Single Layer Pledsmentioning

confidence: 99%

Recent Applications of Conjugated Polyelectrolytes in Optoelectronic Devices

et al. 2008

View full text Add to dashboard Cite

Conjugated polyelectrolytes comprise an electronically delocalized backbone with pendant groups bearing ionic functionalities. Important new developments regarding their use to improve charge injection from metallic electrodes into organic semiconductors, a key requirement in emissive devices, have recently appeared. This article provides an overview of recent studies concerning the basic properties of conjugated polyelectrolytes as a function of molecular structure, and of optoelectronic devices with conjugated polyelectrolytes as essential functional components. Processes where more insightful mechanistic understanding is needed and areas of opportunity are discussed.

show abstract

“…In this, the authors studied the phase behaviour of poly[3-[6-(N-methylimidazolium) hexyl]-2,5-thiophene] bromide (P3ImiHT) in the presence of SDS and deuterated SDS (SDS-d 25 ), in D 2 O. The SANS data for different molar ratios is presented in Fig.…”

Section: Structural Properties Seen Through Sans and Saxs And Light Smentioning

confidence: 99%

“…These differences in the surfactant modulation of the optical properties of conjugated materials are observed regardless of the charge of the polymer and surfactant. However, although, the interaction between conjugated polyelectrolytes with oppositely charged surfactants is strong [7,[24][25][26][27]; the interaction between non-ionic water soluble conjugate and non-ionic surfactants is also possible and leads to interesting surfactochromic effects [7].…”

Section: Introductionmentioning

confidence: 98%