Identification of oxidized polypyrrole on Raman spectrum

Liu, Yu Chuan; Hwang, Bing‐Joe

doi:10.1016/s0379-6779(00)00188-0

Cited by 158 publications

(110 citation statements)

References 30 publications

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“…Figure 1 shows the Raman spectra of a Ppy film formed from a H 2 O/ethanol suspension and the Ppy/GOx/ferrocene electrode; the spectrum of Ppy prepared from aqueous solution is also depicted for comparison. It is well known from the literature 18 that polypyrrole films prepared from aqueous solutions are less conductive than Ppy formed from acetonitrile electrolytes. Attempts have been made to relate some Raman features to this loss of conductivity; specifically, in high-conductive Ppy films 19 , the broad band appearing in the 1000-1050 cm -1 frequency range, assigned to the C-H in plane deformation, presents a well defined doublet at 1045 and 1081 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

Glucose Amperometric Biosensor Based on the Co-immobilization of Glucose Oxidase (GOx) and Ferrocene in Poly(pyrrole) Generated from Ethanol / Water Mixtures

Fiorito¹,

Torresi²

2001

J. Braz. Chem. Soc.

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Neste trabalho é apresentada a co-imobilização de GOx e ferroceno numa matriz polimérica através de um método simples de uma etapa. Esse procedimento para a imobilização de ferroceno como mediador da reação enzimática não envolve a modificação do monômero ou da enzima, o que poderia levar à perda de sua atividade. A incorporação de ferroceno se traduz no incremento da sensibilidade, comparado ao sensor sem mediador redox (1,5 vs 0,23 µA mmol -1 L cm -2 ) e diminuição do potencial de trabalho até 0,4 V. O sensor desenvolvido mostra resposta linear até 10 mmol L -1 e um tempo de resposta de 2 s, além de razoável estabilidade depois de uma semana de uso.The co-immobilization of GOx and ferrocene in a polymeric matrix by a one-step simple method is presented. This procedure to immobilize ferrocene as mediator implies the absence of modification of the monomer or the enzyme that would lead to the loss of its activity. Ferrocene incorporation results in an increase of sensitivity compared with the sensor prepared without the redox mediator (1.5 vs 0.23 µA mmol -1 L cm -2 ) and the decrease of the working potential to 0.4 V. The prepared sensor shows linear response till 10 mmol L -1 and response time of 2 s, in addition to reasonable stability after one week.

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Section: Resultsmentioning

confidence: 99%

Glucose Amperometric Biosensor Based on the Co-immobilization of Glucose Oxidase (GOx) and Ferrocene in Poly(pyrrole) Generated from Ethanol / Water Mixtures

Fiorito¹,

Torresi²

2001

J. Braz. Chem. Soc.

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“…From these results, we verified how synthesis parameters such as oxidation potentials had an influence on the electrochemical properties of the PPP-PPY films. Polypyrrole (PPY) films have been most often related to interesting properties such as high conductivity and stability in air [13][14][15] when prepared in both aqueous and nonaqueous media, and at relatively low oxidation potentials 16,17 . Here, we verified that the electropolymerization of biphenyl and pyrrole allows one to decrease the oxidation potential necessary to obtain PPP-PPY films in acetonitrile.…”

Section: Introductionmentioning

confidence: 99%

Electrosynthesis and optical characterization of poly(p-phenylene), polypyrrole and poly(p-phenylene)-polypyrrole films

et al. 2014

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Poly(p-phenylene) (PPP), polypyrrole (PPY), and poly(p-phenylene-pyrrole) (PPP-PPY) films were electrochemically synthesized in acetronitrile by cyclic voltammetry. For comparison purposes, the films were characterized by cyclic voltammetry in a monomer-free solution, and their optical responses were also obtained in the UV-VIS range of energy after varying the applied potentials. The absorbance spectra of the PPP-PPY film exhibited bands typically seen in the spectra of the homopolymers, PPP and PPY films, but better defined, intense, and related to reversible color transitions. Although it was not possible to confirm by using infrared and Raman spectroscopy that a copolymer was in fact obtained, the presence of both monomers, pyrrole and biphenyl, in the polymerization medium turned easier the process of film formation, yielding darker, more uniform, and rougher films as it was verified by photographic images and AFM (atomic force microscopy) images.

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“…The bands at 1046 and 927 cm -1 were attributed to C-H out-of-plane and in-plane deformation of PPy, respectively. [29] The thermal behavior of silk film was affected by the PPy layer, as evidenced from the thermogravimetric analysis (TGA) results (Figure 3). PPy-pTS powder showed a high thermal stability.…”

Section: Preparation and Characterization Of Sf-ppy Filmmentioning

confidence: 99%

Toward Biodegradable Mg–Air Bioelectric Batteries Composed of Silk Fibroin–Polypyrrole Film

Jia

Wang

Zhao

et al. 2016

Adv Funct Materials

103

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Biodegradable active implantable devices can be used to diagnose and/or treat disease and eventually disappear without surgical removal. If an "external" energy source is required for effective operation then a biocompatible and biodegradable battery would be ideal. In this study, a partially biodegradable Mg-air bioelectric battery (biobattery) is demonstrated using a silk fibroin-polypyrrole (SF-PPy) film cathode coupled with bioresorbable Mg alloy anode in phosphate buffered saline (PBS) electrolyte. PPy is chemically coated onto one side of the silk substrate. SF-PPy film shows a conductivity of ≈1.1 S cm−1 and a mild catalytic activity toward oxygen reduction. It degrades in a concentrated buffered protease XIV solution, with a weight loss of 82% after 15 d. The assembled Mg-air biobattery exhibits a discharge capacity up to 3.79 mA h cm−2 at a current of 10 μA cm−2 at room temperature, offering a specific energy density of ≈4.70 mW h cm−2. This novel partially biodegradable battery provides another step along the route to biodegradable batteries. Abstract:Biodegradable active implantable devices can be used to diagnose and/or treat disease and eventually disappear without surgical removal. If an "external" energy source is required for effective operation then a biocompatible and biodegradable battery would be ideal. In this study, a partially biodegradable Mg-air bioelectric battery (bio-battery) was demonstrated using a silk fibroin-polypyrrole (SF-PPy) film cathode coupled with bioresorbable Mg alloy anode in phosphate buffered saline (PBS) electrolyte. Polypyrrole (PPy) is chemically coated onto one side of the silk substrate. SF-PPy film shows a conductivity of ~1.1 S cm -1 and a mild catalytic activity towards oxygen reduction. It degrades in a concentrated buffered 2 protease XIV solution, with a weight loss of 82% after 15 days. The assembled Mg-air biobattery exhibit a discharge capacity up to 3.79 mA h cm -2 at a current of 10 µA cm -2 at room temperature, offering a specific energy density of ∼4.70 mW h cm -2 . This novel partially biodegradable battery provides another step along the route to biodegradable batteries.

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Identification of oxidized polypyrrole on Raman spectrum

Cited by 158 publications

References 30 publications

Glucose Amperometric Biosensor Based on the Co-immobilization of Glucose Oxidase (GOx) and Ferrocene in Poly(pyrrole) Generated from Ethanol / Water Mixtures

Glucose Amperometric Biosensor Based on the Co-immobilization of Glucose Oxidase (GOx) and Ferrocene in Poly(pyrrole) Generated from Ethanol / Water Mixtures

Electrosynthesis and optical characterization of poly(p-phenylene), polypyrrole and poly(p-phenylene)-polypyrrole films

Toward Biodegradable Mg–Air Bioelectric Batteries Composed of Silk Fibroin–Polypyrrole Film

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