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Han, Yong‐,Hyeon,Travas‐,Sejdic, Jadranka,Wright, Bryon,Yim, Jin‐,Heong WILEY‐VCH Verlag 2011 Macromolecular chemistry and physics Vol.212 No.5
<P><B>Abstract</B></P><P>The co‐vaporization and simultaneous polymerization of EDOT and APTES on a FTS‐coated substrate resulting in a homogeneous PEDOT/ASSQ thin film is described. The physicochemical properties of the film, including surface hardness, solvent mechanical wear resistance, and resistance to scratch, were much better than those of pure PEDOT. A PEDOT/ASSQ hybrid film with homogeneous morphology resulted, as judged by AFM topography scans, surface roughness calculations, and SEM images. The ASSQ proportion in the hybrid films, as investigated by XPS and EDS, was strongly dependent on the content of FTS on the substrate. In addition, the simultaneous polymerization of a PEDOT/ASSQ hybrid film onto selective micropatterns was demonstrated and analyzed.</P>
The antioxidant activity of conducting polymers in biomedical applications
Paul A. Kilmartin,Corrina Thompson,Jadranka Travas-Sejdic,Graham A. Bowmaker,Ralph P. Cooney,Marija Gizdavic-Nikolaidis 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The radical scavenging ability of soluble conducting polymers has been examined using the DPPH assay in comparison withphenolic antioxidant compounds present in the diet. The reducing strength was also determined by voltammetry at a carbonelectrode both in an aqueous pH 7.0 buer, and in methanol as used for the DPPH assay. The conducting polymers were shown tobe good reducing agents and eective scavengers of free radicals, with 24 DPPH radicals being reduced for each aniline or pyrroleunit on the polymer chains. The signicance of this antioxidant capacity for the application of conducting polymers as biomaterialsis considered.
Free radical scavenging properties of polypyrrole and poly(3,4-ethylenedioxythiophene)
Chyong Fang Hsu,Lijuan Zhang,Hui Peng,Jadranka Travas-Sejdic,Paul A. Kilmartin 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Polypyrrole (PPy) and poly(3,4-ethylenedioxythiophene) (PEDOT) powders were prepared using various molar ratios of ammoniumpersulfate (APS) to their respective monomers. The antioxidant properties of these polymers were investigated through their reactionwith the stable and intensely coloured DPPH radical. The DPPH scavenging activity was higher for PPy versus PEDOT, and decreasedfor both conducting polymers as the level of APS oxidant used in their formation was raised. The conductivity of the resulting polymers.
Quenching of an indocarbocyanine dye and functionalized CdSe/ZnS quantum dots by gold surfaces
Tanja Kjallman,Hui Peng,Christian Soeller,Jadranka Travas-Sejdic 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Quantum dots (QDs) have unique optical properties and several advantages over conventional organic dyes. The ability to make QDswater soluble allows for use in various biological applications. Smooth metallic surfaces are known to quench the uorescence of bothorganic dyes and of certain QDs. This paper provides a comparative study of the quenching ability of an unmodied and a poly(ethyl-eneglycol) (PEG)-modied Au surface, of the emission from an organic dye and from CdSe/ZnS QDs. PEG is a biocompatible moleculeunmodied and a PEG-modied Au surface are able to quench the emission from the dye and the QDs. Some interactions betweenthe QDs and the unmodied Au surface were also observed, although the interactions are signicantly suppressed by the presence ofPEG. The PEG-modied Au surface is suitable for further applications, involving biomolecules, where its ecient quenching abilityand protein resistivity can be utilized.
Polyaniline nanotubes doped with polymeric acids
Lijuan Zhang,Hui Peng,Jing Sui,Paul A. Kilmartin,Jadranka Travas-Sejdic 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Self-assembled polyaniline (PANI) nanotubes were prepared in the presence of three dierent polymeric acids as dopants, namelypoly(4-styrenesulfonic acid) (PSSA), poly(acrylic acid) (PAA) and poly(methyl vinyl ether-alt-maleic acid) (PMVEA) by oxidative poly-merization using ammonium persulfate as the oxidant. The molecular structure of polymeric acids had a signicant eect on the mor-phology and size of the polyaniline nanotubes as determined by SEM. The PANI nanotubes were also characterized by FTIRspectroscopy and electron paramagnetic resonance spectroscopy.
Label-Free, Electrochemical Quantitation of Potassium Ions from Femtomolar Levels.
Zhu, Bicheng,Booth, Marsilea A,Woo, Han Young,Hodgkiss, Justin M,Travas-Sejdic, Jadranka Wiley-VCH 2015 Chemistry - An Asian Journal Vol.10 No.10
<P>In this communication, a label-free and sensitive electrochemical method to detect potassium ions is proposed. The conducting polymer polypyrrole was used as both an anchor for the probe and a transducer of the detection event. A K(+) -specific G-rich aptamer was applied as a recognition element, which folded into the G-quadruplex structure in the presence of K(+) , and this resulted in an increase in the electrode impedance. The combination of the K(+) -selective aptamer and the porous conducting polymer as a signal transducer afforded a successful sensor platform. The sensor responded approximately logarithmically over a wide dynamic range of K(+) concentrations from 20?fm to 1?mm, with a very low detection limit of 14.7?fm and excellent discrimination against other ions. Additionally, electrochemical impedance spectroscopy was used to study the kinetics of K(+) binding at the conducting polymer-immobilized aptamer surface, which indicated strong binding between the two. This work demonstrates a powerful approach for the sensitive, selective, and direct electrochemical detection of metal ions based on the switching conformation of G-rich aptamers attached to a porous conducting polymer surface. This assay scheme can be expanded to the detection of a wide range of targets by modifying the aptamer structure as a recognizing moiety.</P>