Synthesis, characterization and DC conductivity studies of polypyrrole/copper zinc iron oxide nanocomposites

Shanthala, V.S.; Devi, S.N. Shobha; Murugendrappa, M. V.

doi:10.1016/j.jascer.2017.02.005

Cited by 51 publications

(13 citation statements)

References 16 publications

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“…The peaks at 3283 cm À 1 are assigned to the presence of NÀ H stretching vibrations. The observed peaks in Figure 2A confirm formation of polypyrrole and they are consistent with literature [27]. Figure 2B demonstrates FESEM images of the synthesized PPy on the surface of the Pt electrode.…”

Section: Modification Of the Electrodesupporting

confidence: 85%

A Novel Bioelectrochemical Sensor Based on Immobilized Urease on the Surface of Nickel Oxide Nanoparticle and Polypyrrole Composite Modified Pt Electrode

2019

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Nickel oxide nanoparticle (NiOÀ NP) and polypyrrole (PPy) composite were deposited on a Pt electrode for fabrication of a urea biosensor. To develop the sensor, a thin film of PPyÀ NiO composite was deposited on a Pt substrate that serves as a matrix for the immobilization of enzyme. Urease was immobilized on the surface of Pt/ PPyÀ NiO by a physical adsorption. The response of the fabricated electrode (Pt/PPyÀ NiO/Urs) towards urea was analyzed by chronoamperometry and cyclic voltammetry (CV) techniques. Electrochemical response of the bioelectrode was significantly enhanced. This is due to electron transfer between Ni 2 + and Ni 3 + as the electrocatalytic group and the reaction between polypyrrole and the urease-liberated ammonium. The fabricated electrode showed reliable and demonstrated perfectly linear response (0.7-26.7 mM of urea concentration, R 2 = 0.993), with high sensitivity (0.153 mA mM À 1 cm À 2 ), low detection of limit (1.6 μM), long stability (10 weeks), and low response time (~5 s). The developed biosensor was highly selective and obtained data were repeatable and reproduced using PPy-NiO composite loaded with immobilized urease as urea biosensors.

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Section: Modification Of the Electrodesupporting

confidence: 85%

A Novel Bioelectrochemical Sensor Based on Immobilized Urease on the Surface of Nickel Oxide Nanoparticle and Polypyrrole Composite Modified Pt Electrode

2019

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“…Nanoscale conductive polymers with high surface-to-volume ratio and good conductivity are a suitable option as support. Polypyrrole (PPy) is a conductive polymer that can be synthesized using chemical and electrochemical methods in aqueous or a nonaqueous media in a wide range of pH [18][19][20]. Due to biocompatibility [21], conductivity [22], the possibility of synthesis at relatively low potentials (which means less energy consumption) [23], and, most importantly, the ability to interact (reversible deprotonation) with ammonium [24][25][26], PPy is a suitable option for urea biosensing applications.…”

Section: Co(n Hmentioning

confidence: 99%

Amperometric urea biosensor based on immobilized urease on polypyrrole andmacroporous polypyrrole modified Pt electrode

Hosseinian¹,

Najafpour²,

Rahimpour³

2019

Turk J Chem

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Biosensing of urea by a biosensor as a direct detection method at ambient temperature and pressure instead of chromatography leads to a significant reduction in processing costs. Amperometric biosensors based on urease immobilization on macroporous polypyrrole (MPPy) and pyrrole on the surface of a Pt electrode were developed. Applying cyclic voltammetry (CV), we demonstrated the synthesis of MPPy using monodispersed polystyrene spheres (460 nm) as a template. CV and chronoamperometric studies were conducted to evaluate the electrochemical current of the modified electrodes. For the electrode with polypyrrole (PPy), the biosensor response was linear in the range of 1.67-8.32 mM (R 2 = 0.99). Sensitivity, detection limit, and response time of this biosensor were 0.0035 mA mM −1 , 2.57 mM, and ∼ 7 s, respectively. For the electrode with MPPy, the linear range was 0.5-10.82 mM (R 2 = 0.99). For this biosensor, sensitivity, detection limit (S/N = 3), and response time were 0.0432 mA mM −1 , 0.208 mM, and ∼ 5 s, respectively. The modified biosensor with MPPy showed high stability and desirable selectivity for urea.

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“…The polymerization reaction rate is very important for the control of particle size, shape, and some other properties [27]. In some particular cases the polymerization rate is controlled by the variation of temperature, but other parameters as size and shape are rarely controlled this way [28]. From a technological point of view it is important to determine relatively mild oxidative conditions suitable for the chemical synthesis of Ppy which will allow slower and better controlled formation of Ppy.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polypyrrole Induced by [Fe(CN)6]3− and Redox Cycling of [Fe(CN)6]4−/[Fe(CN)6]3−

2018

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Chemical synthesis of the conducting polymer polypyrrole induced by [Fe(CN) 6 ] 3− is reported. Reaction kinetics were characterized spectrophotometrically. Reaction rate was evaluated at several different pH levels in the presence of [Fe(CN) 6 ] 3− and [Fe(CN) 6 ] 4− ions. The formation of polypyrrole at aerobic and anaerobic conditions was evaluated. We report that at anaerobic conditions [Fe(CN) 6 ] 4− cannot initiate oxidative polymerization, while its oxidized form [Fe(CN) 6 ] 3− successfully initiates and maintains the pyrrole polymerization reaction. The formation of polypyrrole was also observed in the solution containing a pyrrole monomer, [Fe(CN) 6 ] 4− and dissolved oxygen due to re-oxidation (redox cycling) of [Fe(CN) 6 ] 4− into [Fe(CN) 6 ] 3− by dissolved oxygen. Experiments to determine the polymerization reaction rate were performed and showed the highest rate in the presence of 0.5 mM of [Fe(CN) 6 ] 3− at pH 9.0, while the polymerization reaction performed at pH 7.0 was determined as the slowest. This investigation opens new horizons for the application of [Fe(CN) 6 ] 4− /[Fe(CN) 6 ] 3− -based redox cycling reactions in the synthesis of the conducting polymer polypyrrole and potentially in the formation of other conducting polymers which can be formed by oxidative polymerization.

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Synthesis, characterization and DC conductivity studies of polypyrrole/copper zinc iron oxide nanocomposites

Cited by 51 publications

References 16 publications

A Novel Bioelectrochemical Sensor Based on Immobilized Urease on the Surface of Nickel Oxide Nanoparticle and Polypyrrole Composite Modified Pt Electrode

A Novel Bioelectrochemical Sensor Based on Immobilized Urease on the Surface of Nickel Oxide Nanoparticle and Polypyrrole Composite Modified Pt Electrode

Amperometric urea biosensor based on immobilized urease on polypyrrole andmacroporous polypyrrole modified Pt electrode

Synthesis of Polypyrrole Induced by [Fe(CN)6]3− and Redox Cycling of [Fe(CN)6]4−/[Fe(CN)6]3−

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