Electroconducting materials based on polypyrrole

Porjazoska-Kujundziski, Aleksandra; Chamovska, Dragica; Grchev, Toma

doi:10.5937/zasmat1602282p

Cited by 4 publications

(2 citation statements)

References 111 publications

(121 reference statements)

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“…In another strategy, nanocomposites of PPy and carbon nanomaterials, such as activated carbon, [21–23] graphene oxide, [24–28] reduced graphene oxide, [29–31] and multi‐walled [32–36] and single‐walled [37–40] carbon nanotubes, have been fabricated, and an improved performance of these composites in comparison to pristine PPy has been reported. Among these carbon nanomaterials, multi‐walled carbon nanotubes (MWCNTs) are particularly useful in the preparation of composites with polypyrrole.…”

Section: Introductionmentioning

confidence: 99%

Oxidized MWCNTs as an Oxidizing Agent and Dopant in MWCNT@Polypyrrole Composite Formation**

et al. 2021

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A new approach to the formation of composites of carbon nanotubes and polypyrrole (PPy) is proposed. Oxidized multi‐walled carbon nanotubes (ox‐MWCNTs) are used as oxidation agents in pyrrole polymerization. The polymeric phase is deposited both at the surface of the carbon nanotube to form a core‐shell structure and in the empty spaces of the MWCNT network. Each form of the polypyrrole phase exhibits different electrochemical properties. PPy deposited directly at the carbon nanotube surface as a uniform and dense layer is oxidized at less positive potentials, compared to the polymeric material deposited in the pores of the nanotube network. MWCNTs with anions incorporated into structural defects formed during their oxidation in a piranha solution also act as dopants of the oxidized form of PPy. The polymeric film deposited directly at the ox‐MWCNT surface is in its oxidized state. The redox processes involving this part of the PPy film are accompanied by the transport of cations of the supporting electrolyte. The charge transfer between ox‐MWCNTs and the deposited PPy film is confirmed by the results of the theoretical calculations of the energy states at the carbon nanotube and polypyrrole interface. A neutral PPy film located in layers remote from the surface of the nanotube is oxidized at more positive potentials. The oxidation of PPy located in the pores of the ox‐MWCNT network results in a broad voltammetric peak formation.

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Section: Introductionmentioning

confidence: 99%

Oxidized MWCNTs as an Oxidizing Agent and Dopant in MWCNT@Polypyrrole Composite Formation**

et al. 2021

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“…La rapidez del proceso de intercambio de iones complica las medidas electroquímicas. Es casi imposible estudiar las propiedades electroquímicas de un electrodo modificado con PPy, dopado con aniones móviles en una solución que contiene otros aniones móviles, ya que incluso durante el muy corto tiempo necesario para la saturación de la solución con un gas inerte y la preparación de la medición, la mayoría de los aniones presentes en el PPy se sustituyen por los aniones de la solución (Porjazoska-Kujundziski, A., et al 2016).…”

Section: Electrodos Modificados Con Polímeros Conductoresunclassified

Ingeniería de superficies de electrodo modificadas mediante materiales poliméricos responsivos y nanopartículas metálicas

Gutiérrez-Pineda¹,

Bolzán²

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La modificación superficial de materiales de electrodo convencionales, con el objeto de mejorar sus propiedades ha sido tema de investigación desde hace muchos años. El interés en electrodos modificados se basa en sus posteriores aplicaciones en diversos campos, entre ellos sensores, almacenamiento y conversión de energía, liberación controlada de medicamentos, protección contra la corrosión, superficies hidrófobas, entre otras. Una amplia variedad de materiales aptos para la modificación de superficies de electrodo se encuentran actualmente disponibles. Entre ellos se destacan los polímeros conductores, las nanopartículas metálicas, los cepillos poliméricos, los materiales carbonosos (grafeno, nanotubos de carbono), membranas lipídicas, hidrogeles electroconductores, mencionando solamente los más comunes. Recientemente, un gran interés en el desarrollo de electrodos híbridos o compósitos basados en diversas combinaciones de polímeros conductores con otros materiales orgánicos e inorgánicos, para fines electroanalíticos con el objeto de mejorar la sensibilidad y selectividad en la detección de diversos analitos han sido desarrollados. Los electrodos compósitos ofrecen muchas ventajas potenciales en comparación con los electrodos más tradicionales, consistentes en una fase conductora simple. Por ejemplo, los electrodos compósitos pueden a menudo fabricarse con gran flexibilidad a cuanto al tamaño y forma del material, permitiendo una fácil adaptación a una gran variedad de configuraciones electródicas. Esta investigación presenta el diseño y desarrollo racional de electrodos compósito basados en polímeros conductores y arreglo de nanopartículas metálicas, hidrogeles electroconductores y cepillos poliméricos, además su posterior evaluación en sistemas de detección, liberación electroestimulada de fármacos y superficies barrera con control de la permeabilidad respectivamente.

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Electrochemical syntheses and characterization of some polydyes and their application for the simultaneous determination of ascorbic acid and uric acid

Guyasa,

Beyene,

Anshebo

2024

J Appl Electrochem

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The electropolymerization and characterization of the monomers: gentian violet (GV), brilliant green (BG), aniline, and methyl violet (MV) and their copolymers were done using cyclic voltammetry (CV) on glassy carbon electrode (GCE) as a working electrode against Ag/AgCl reference electrode and platinum wire as counter electrode. The copolymers showed higher current peaks than their corresponding homopolymers.The electrochemical characterization of these polymers and copolymers was studied by scan rate effect each between 10 and 300 mV/s and pH effect between 1.56 and 5.30. After being modi ed by the copolymers: poly(BG-GV) and poly(BG-MV), the modi ed GCE showed good results in resolving the peaks of ascorbic acid and uric acid which otherwise showed one broad peak on bare GCE. The determination of the area of the modi ed electrode was done with all polymers investigated and also their copolymers. The CV in bare GCE was scanned at different scan rates of 4 mM K 3 [Fe(CN) 6 ] in 1 M KNO 3 solution. The square root of scan rate dependence of peak current was plotted and the Randles-Sevcik equation was applied to determine the diffusion coe cient of Fe(CN) 6 3− ion and which was 1.13 x 10 − 14 cm 2 /s. This was used to determine the area after running the CV of 4 mM K 3 [Fe(CN) 6 ] in 1 M KNO3 at different scan rates. From the plot of peak current vs. square root of scan rate, the slope was determined and used to determine the area of the modi ed electrode from the Randles-Sevcik equation.

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Electroconducting materials based on polypyrrole

Abstract: ABSTRACT

Cited by 4 publications

References 111 publications

Oxidized MWCNTs as an Oxidizing Agent and Dopant in MWCNT@Polypyrrole Composite Formation**

Oxidized MWCNTs as an Oxidizing Agent and Dopant in MWCNT@Polypyrrole Composite Formation**

Ingeniería de superficies de electrodo modificadas mediante materiales poliméricos responsivos y nanopartículas metálicas

Electrochemical syntheses and characterization of some polydyes and their application for the simultaneous determination of ascorbic acid and uric acid

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