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Yakovleva, A. A.

doi:10.1023/a:1026647529510

Cited by 18 publications

(12 citation statements)

References 15 publications

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“…In the case of PPyNSA, the yield decreases with d/m as follows: 0.8 > 0.1 > 0.5. This trend indicates that an optimal pH range of about 1.0 to 1.5 is required for the synthesis of the various PPys which agrees with Yakovleva [11] report that agitating the dopant and monomer mixture at a pH less than 1.0 dramatically decreased the rate of electrosynthesis of PPys [11]. Polypyrrole yield increased with the size of the dopant ion: b-naphthalene sulfonate giving higher yield than chloride.…”

Section: Polymerization Yieldsupporting

confidence: 83%

“…Similarly, the C-H stretching band at 3100 cm À1 was absent in all the three oxidized PPys, though there was a new sharp and pronounced peak at 3190 cm . In proposing a mechanism for the polymerization of polypyrrole in aqueous medium, Yakovleva [11] predicted the possibility of the formation of pyrrole complexes in acid solutions with the proton and anion in solution, in accordance with Scheme 2. He opined that the discharge of pyrrole complexes with the anion and proton and their destruction yield radical-cation and radical species which could jointly interact with the active ends of pyrrole links to induce the growth and development of polymer chains.…”

Section: Uv-vis Absorption and Solubilitymentioning

confidence: 85%

“…Polypyrrole yield increased with the size of the dopant ion: b-naphthalene sulfonate giving higher yield than chloride. Earlier studies [11] on electrochemically-synthesized PPy also found that the yield increases with the size of dopant ion. For example, the rate of electrosynthesis of PPy in different electrolytes follow the trend ClO 4 À > HSO 4 À > Cl À .…”

Section: Polymerization Yieldmentioning

confidence: 85%

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Electrochemical Interrogation and Sensor Applications of Nanostructured Polypyrroles

et al. 2006

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The polymerization of pyrrole in b-naphthalene sulfonic acid (NSA) gave nanotubules, nanomicelles or nanosheets of polypyrrole (PPy) depending on the amount of NSA in the polymer and the temperature of the reaction. Scanning electron microscopy (SEM) measurements showed that the diameters of the nanostructured polypyrrole-bnaphthalene sulfonic acid (PPyNSA) composites were 150 -3000 nm for the tubules, 100 -150 nm for the micelles and 20 nm for the sheets. A red shift in the UV-vis absorption spectra of PPy was observed for PPyNSA which indicates the involvement of bulky b-naphthalene sulfonate ion in the polymerization process. The UV-vis also showed the existence of polaron and bi-polaron in the polymer which may be responsible for the improved solubility of PPyNSA compared to PPy. All the characteristic IR bands of polypyrrole were observed in the FTIR spectra of PPyNSA, with slight variation in the absolute values. However, the absence of NÀH stretching at 3400 cm À1 and 1450 cm À1 usually associated with neutral polypyrrole confirms that the polymer is not in the aromatic state but in the excited polaron and bipolaron defect state. Electrochemical analysis of PPyNSA reveals two redox couples: a/a' -partly oxidized polypyrrole-naphthalene sulfonate radical cation/neutral polypyrrole naphthalene sulfonate; b/b' -fully oxidized naphthalene sulfonate radical cation/partly reduced polypyrrole-naphthalene sulfonate radical anion. The corresponding formal potentials measured at 5 mV/s, E8' (5 mV/s) , are 181 mV and 291 mV, respectively. Amperometric phenol sensor constructed with PPyNSA on a glassy carbon electrode (GCE) gave a sensitivity of 3.1 mA M À1 and a dynamic linear range of 0.65 -139.5 mM. The data for the determination of phenol on the GCE/ PPyNSA electrode was consistent with the electrocatalytic Michaelis-Menten model, giving an apparent MichaelisMenten constant (K M ') value of 160 mM.

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Section: Polymerization Yieldsupporting

confidence: 83%

Section: Uv-vis Absorption and Solubilitymentioning

confidence: 85%

Section: Polymerization Yieldmentioning

confidence: 85%

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Electrochemical Interrogation and Sensor Applications of Nanostructured Polypyrroles

et al. 2006

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“…Surfactants are used as polymer additives in order to control the morphology and when implicitly incorporated into the conducting polymer backbone, it serves to improve the conductivity, stability, solubility in organic solvents and processability [22]. Surfactants affect the preparation of conducting polymers in three ways, i.e., (i) the micelles control the distribution of reactants between the micellar and the aqueous phase and thus exerts some control over the polymerization pathway (ii) anionic surfactants may act as counter ions for the polymer polycations and (iii) the hydrophobic tail of the surfactant may adsorb on the polymer formed at the electrode surface and thus becomes part of the resulting material, influencing its chemical properties [23].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis and Characterization of 1,2‐Naphthaquinone‐4‐Sulfonic Acid Doped Polypyrrole

et al. 2007

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Polypyrrole thin film microelectrodes prepared from an aqueous solution of the sodium salt of 1, 2-napthaquinone-4-sulfonic acid and pyrrole in hydrochloric acid as the supporting electrolyte was characterized electrochemically for the first time and found to exhibit good electronic and spectroscopic properties. Voltammetric investigations showed that the polymer exhibited quasireversible kinetics in a potential window of À 400 mV to 700 mV, with a formal potential of 322 mV vs. Ag/AgCl. The diffusion coefficient was calculated to be 1.02 Â 10 À6 cm 2 s À1 for a thin film with a surface concentration of 1.83 Â 10 À7 mol cm À2 having a rate constant of 2.20 Â 10 À3 cm s À1 at 5 mV s À1 . Electrochemical impedance spectroscopy provided quantitative information about the conductivity changes within the modified polymer and support for the quasireversible kinetics suggested by voltammetry. The changes in electrical properties of the polymer during electrochemical p-doping and n-doping were quantified by equivalent electrical circuit fitting and assisted in the identification of the suggested kinetic mechanism. SNIFTIRS confirmed the incorporation of the surfactant into the polypyrrole film and for the first time structural changes within the polymer were observed that could be related to the observed electrochemistry of the polymer.

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“…Conducting polymers have been a hot research area for many academic institutions for several decades . This research has supported the industrial development of conducting polymer products and has provided the fundamental understanding of the chemistry, physics and materials science of these materials.…”

Section: Introductionmentioning

confidence: 99%

Study on the preparation and multiproperties of the polypyrrole films doped with different ions

Cheng

Ding

Zhang

et al. 2012

Surface & Interface Analysis

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Conducting polypyrrole (PPy) films doped with p‐toluene solfonate (pTS−), perchlorate (ClO4−) and polyphosphate (PP−) were electrochemically synthesized on the stainless steel SS‐304 and the Indium Tin Oxide (ITO) glass substrates successfully. The conducting polymer composite films were studied by Fourier transform infrared spectra, integrated thermal analysis system and scanning electron microscopy, respectively. Four‐point probe measurements and in situ nanotribolab system equipped with a nanoscale electrical contact resistance package were employed to analyze their electrical and mechanical properties. Results indicate that the film doped with PP− ion showed the best thermal stability. For the ClO4− ion doped films, the glass transition occurred at 274.8 °C. The pTS− ion doped film on the SS‐304 steel had a good conductivity, and there was a voltage barrier that ranged from −1.25 to 1.9 V according to the current–voltage curves. Nanoindentation tests show that the mechanical properties of the PPy/pTS− film and the PPy/PP− film were better than that of PPy/ClO4− films. Copyright © 2012 John Wiley & Sons, Ltd.

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Untitled

Cited by 18 publications

References 15 publications

Electrochemical Interrogation and Sensor Applications of Nanostructured Polypyrroles

Electrochemical Interrogation and Sensor Applications of Nanostructured Polypyrroles

Electrochemical Synthesis and Characterization of 1,2‐Naphthaquinone‐4‐Sulfonic Acid Doped Polypyrrole

Study on the preparation and multiproperties of the polypyrrole films doped with different ions

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