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Conjugated Polymers

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (20 January 2014) | Viewed by 29628

Special Issue Editor

School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore

Special Issue Information

Dear Colleagues,

Conjugated polymers are a versatile class of organic functional materials which have attracted much interest for their optical and electronic properties, and their wide range of potential applications in organic electronic devices such as transistors, LEDs, solar cells, photodetectors, lasers, or sensors. Already many types of prototype devices have been made and some are now commercially available. In this issue we aim to present a range of articles on conjugated polymers as materials, with topics ranging from their synthesis and characterization through to their use in devices.

Dr. Andrew Grimsdale
Guest Editor

Manuscript Submission Information

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Keywords

  • conjugated polymers
  • organic semiconductors
  • luminescence
  • charge transport
  • light-emitting devices
  • transistors
  • sensors
  • solar cells

Published Papers (3 papers)

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Research

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1036 KiB  
Article
Selective Interaction of a Cationic Polyfluorene with Model Lipid Membranes: Anionic versus Zwitterionic Lipids
by Zehra Kahveci, María José Martínez-Tomé, Rocío Esquembre, Ricardo Mallavia and C. Reyes Mateo
Materials 2014, 7(3), 2120-2140; https://doi.org/10.3390/ma7032120 - 13 Mar 2014
Cited by 13 | Viewed by 7645
Abstract
This paper explores the interaction mechanism between the conjugated polyelectrolyte {[9,9-bis(6'-N,N,N-trimethylammonium)hexyl]fluorene-phenylene}bromide (HTMA-PFP) and model lipid membranes. The study was carried out using different biophysical techniques, mainly fluorescence spectroscopy and microscopy. Results show that despite the preferential interaction of HTMA-PFP with anionic lipids, HTMA-PFP [...] Read more.
This paper explores the interaction mechanism between the conjugated polyelectrolyte {[9,9-bis(6'-N,N,N-trimethylammonium)hexyl]fluorene-phenylene}bromide (HTMA-PFP) and model lipid membranes. The study was carried out using different biophysical techniques, mainly fluorescence spectroscopy and microscopy. Results show that despite the preferential interaction of HTMA-PFP with anionic lipids, HTMA-PFP shows affinity for zwitterionic lipids; although the interaction mechanism is different as well as HTMA-PFP’s final membrane location. Whilst the polyelectrolyte is embedded within the lipid bilayer in the anionic membrane, it remains close to the surface, forming aggregates that are sensitive to the physical state of the lipid bilayer in the zwitterionic system. The different interaction mechanism is reflected in the polyelectrolyte fluorescence spectrum, since the maximum shifts to longer wavelengths in the zwitterionic system. The intrinsic fluorescence of HTMA-PFP was used to visualize the interaction between polymer and vesicles via fluorescence microscopy, thanks to its high quantum yield and photostability. This technique allows the selectivity of the polyelectrolyte and higher affinity for anionic membranes to be observed. The results confirmed the appropriateness of using HTMA-PFP as a membrane fluorescent marker and suggest that, given its different behaviour towards anionic and zwitterionic membranes, HTMA-PFP could be used for selective recognition and imaging of bacteria over mammalian cells. Full article
(This article belongs to the Special Issue Conjugated Polymers)
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684 KiB  
Article
Preparation and Chemical Properties of π-Conjugated Polymers Containing Indigo Unit in the Main Chain
by Hiroki Fukumoto, Hisashi Nakajima, Takahiro Kojima and Takakazu Yamamoto
Materials 2014, 7(3), 2030-2043; https://doi.org/10.3390/ma7032030 - 11 Mar 2014
Cited by 9 | Viewed by 7851
Abstract
π-Conjugated polymers based on indigo unit were prepared. Dehalogenative polycondensation of N-hexyl-6,6'-dibromoindigo with a zerovalent nickel complex gave a homopolymer, P(HexI), in 77% yield. Copolymer of N-hexyl-indigo and pyridine, P(HexI-Py), was also prepared in 50% yield. P(HexI) showed good [...] Read more.
π-Conjugated polymers based on indigo unit were prepared. Dehalogenative polycondensation of N-hexyl-6,6'-dibromoindigo with a zerovalent nickel complex gave a homopolymer, P(HexI), in 77% yield. Copolymer of N-hexyl-indigo and pyridine, P(HexI-Py), was also prepared in 50% yield. P(HexI) showed good solubility in organic solvents, whereas P(HexI-Py) was only soluble in acids such as HCOOH. The weight-average molecular weights (Mw) of P(HexI) and P(HexI-Py) were determined to be 10,000 and 40,000, respectively, by a light scattering method. Pd-catalyzed polycondensation between 6,6'-dibromoindigo with N-BOC (BOC = t-butoxycarbonyl) substituents and a diboronic compound of 9,9-dioctylfluorene afforded the corresponding alternating copolymer, P(BOCI-Flu), as a deep red solid in 98% yield. P(BOCI-Flu) was soluble in N-methyl-2-pyrroridone and showed an Mw of 29,000 in GPC analysis. Treatment of P(BOCI-Flu) with CF3COOH smoothly led to a BOC-deprotection reaction to give an insoluble deep green polymer, P(I-Flu), in a quantitative yield. Diffuse reflectance spectra of powdery P(BOCI-Flu) and P(I-Flu) showed peaks at about 580 nm and 630 nm, respectively, which are thought to originate from the indigo unit. Full article
(This article belongs to the Special Issue Conjugated Polymers)
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Review

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1680 KiB  
Review
Electrospun Polymer Fibers for Electronic Applications
by Alessandro Luzio, Eleonora Valeria Canesi, Chiara Bertarelli and Mario Caironi
Materials 2014, 7(2), 906-947; https://doi.org/10.3390/ma7020906 - 28 Jan 2014
Cited by 98 | Viewed by 13762
Abstract
Nano- and micro- fibers of conjugated polymer semiconductors are particularly interesting both for applications and for fundamental research. They allow an investigation into how electronic properties are influenced by size confinement and chain orientation within microstructures that are not readily accessible within thin [...] Read more.
Nano- and micro- fibers of conjugated polymer semiconductors are particularly interesting both for applications and for fundamental research. They allow an investigation into how electronic properties are influenced by size confinement and chain orientation within microstructures that are not readily accessible within thin films. Moreover, they open the way to many applications in organic electronics, optoelectronics and sensing. Electro-spinning, the technique subject of this review, is a simple method to effectively form and control conjugated polymer fibers. We provide the basics of the technique and its recent advancements for the formation of highly conducting and high mobility polymer fibers towards their adoption in electronic applications. Full article
(This article belongs to the Special Issue Conjugated Polymers)
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