The effects of dye dopants on the conductivity and optical absorption properties of polypyrrole

Håkansson, Eva; Lin, Tong; Wang, Hongxia; Kaynak, Akif

doi:10.1016/j.synthmet.2006.08.006

Cited by 102 publications

(52 citation statements)

References 46 publications

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“…Such morphology is preferred for gas sensing and catalytic application, as it promotes adsorption of different biological and gas molecules through the film surface, so excellent sensitivity can be expected. 61,62 All of these micrographs confirm the lack of phase separation of the films, supporting the homogeneous film formation of Ppy with CS and ZnO NPs. Figure 6D, E, and F shows the energy-dispersive X-ray fluorescence (EDXRF) spectra for the Ppy, Ppy/CS, and Ppy/ ZnO/CS BNCs.…”

Section: Intensity (Arbitrary Units) 2θ (Degrees)supporting

confidence: 59%

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Ebrahimiasl¹,

Zakaria²,

Kassim³

et al. 2014

IJN

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An antibacterial and conductive bionanocomposite (BNC) film consisting of polypyrrole (Ppy), zinc oxide (ZnO) nanoparticles (NPs), and chitosan (CS) was electrochemically synthesized on indium tin oxide (ITO) glass substrate by electrooxidation of 0.1 M pyrrole in aqueous solution containing appropriate amounts of ZnO NPs uniformly dispersed in CS. This method enables the room temperature electrosynthesis of BNC film consisting of ZnO NPs incorporated within the growing Ppy/CS composite. The morphology of Ppy/ZnO/CS BNC was characterized by scanning electron microscopy. ITO–Ppy/CS and ITO–Ppy/ZnO/CS bioelectrodes were characterized using the Fourier transform infrared technique, X-ray diffraction, and thermogravimetric analysis. The electrical conductivity of nanocomposites was investigated by a four-probe method. The prepared nanocomposites were analyzed for antioxidant activity using the 2,2-diphenyl-1-picrylhydrazyl assay. The results demonstrated that the antioxidant activity of nanocomposites increased remarkably by addition of ZnO NPs. The electrical conductivity of films showed a sudden decrease for lower weight ratios of ZnO NPs (5 wt%), while it was increased gradually for higher ratios (10, 15, and 20 wt%). The nanocomposites were analyzed for antibacterial activity against Gram-positive and Gram-negative bacteria. The results indicated that the synthesized BNC is effective against all of the studied bacteria, and its effectiveness is higher for Pseudomonas aeruginosa . The thermal stability and physical properties of BNC films were increased by an increase in the weight ratio of ZnO NPs, promising novel applications for the electrically conductive polysaccharide-based nanocomposites, particularly those that may exploit the antimicrobial nature of Ppy/ZnO/CS BNCs.

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Section: Intensity (Arbitrary Units) 2θ (Degrees)supporting

confidence: 59%

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Ebrahimiasl¹,

Zakaria²,

Kassim³

et al. 2014

IJN

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“…Except for the varied transmittance value, new peaks at 1670, 1236 and 713 cm À1 were also found for the AQS/ PPy composite. This FTIR spectra agrees well with that reported in literature [43] for AQSA-PPy powder, in which the coupling of S=O with the stretching vibration of the pyrrole ring was confirmed at 1230 cm…”

Section: Characterization Of Aqs/ppy Compositesupporting

confidence: 92%

Enhanced Electrocatalytic Performance of Anthraquinonemonosulfonate‐Doped Polypyrrole Composite: Electroanalysis for the Specific Roles of Anthraquinone Derivative and Polypyrrole Layer on Oxygen Reduction Reaction

Sha

Zhang

et al. 2010

Electroanalysis

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To analyze the specific roles of anthraquinone-2-sulfonate (AQS) and polypyrrole (PPy) layer on oxygen reduction reaction (ORR), the electrocatalytic reduction of oxygen was investigated on the AQS/PPy composite modified graphite electrode. Results show that the enhanced electrocatalytic performance is attributed to the excellent electrocatalytic activity of the immobilized AQS functional groups to mediate two-electron reduction of O 2 to H 2 O 2 . The PPy layer may not participate in ORR, but it can further catalyze the two-electron reduction of H 2 O 2 to produce H 2 O in the potential range more negative than that the two-electron reduction of oxygen proceeds efficiently on the AQS sites.

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“…A banda de absorção em 960 cm -1 é atribuída à deformação do anel de pirrol fora do plano (C-C). Estes resultados estão de acordo com os encontrados na literatura [32][33][34] e revelam que o PPy se encontra no estado dopado, caracterizado pela banda de absorção em 1086 [35] . No espectro de PPy.SDS, observa-se um deslocamento das bandas de absorção para valores de número de onda menores quando comparado ao espectro do PPy, este resultado pode estar relacionado com o maior grau de dopagem do polipirrol com SDS (surfactante aniônico).…”

Section: Caracterizaçãounclassified

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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Resumo: Nanocompósitos de montmorilonita/polipirrol (MMT/PPy) foram preparados a partir da polimerização in situ do pirrol na presença de argila, bentonita sódica natural, (MMT-Na + ) em solução aquosa com ou sem surfactante aniônico, dodecil sulfato de sódio (SDS), utilizando-se o cloreto de ferro (III) hexahidratado (FeCl 3 .6H 2 O), como oxidante. A estrutura e propriedades dos nanocompósitos obtidos pela polimerização in situ do pirrol na presença de SDS (MMT/PPy.SDS) e sem surfactante (MMT/PPy) foram avaliadas e comparadas a partir da espectroscopia de infravermelho com transformada de Fourier (FTIR), difração de raios X (DRX), microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET), análise termogravimétrica (TG) e método padrão quatro pontas. Os difratogramas dos nanocompósitos revelaram que o espaçamento basal d 001 da MMT (1,42 nm) foi alterado para valores maiores, indicando a intercalação do PPy na MMT para ambos os nanocompósitos obtidos. Os difratogramas e as imagens de MET e MEV dos nanocompósitos de MMT/PPy.SDS confirmaram que a presença do SDS na reação promoveu, além da intercalação, esfoliação parcial da argila. Os nanocompósitos MMT/PPy.SDS apresentaram condutividade elétrica (9,50 S/cm) maior do que o nanocompósito de MMT/PPy (4,44 S/cm). A presença da argila melhorou de forma significativa a estabilidade térmica do PPy. Palavras-chave: Polipirrol, montmorilonita, nanocompósitos, condutividade elétrica. The Preparation of Montmorillonite/polypyrrole Nanocomposites: The Effect of Surfactant Incorporation on the Structure and PropertiesAbstract: Montmorillonite/polypyrrole (MMT/PPy) nanocomposites were prepared by the in situ polymerization of pyrrole in the presence of clay, natural sodium bentonite, (MMT-Na + ) in aqueous solutions with or without an anionic surfactant, sodium dodecyl sulfate (SDS), using Iron (III) chloride hexahydrate (FeCl 3 .6H 2 O) as oxidant. The structure and properties of the nanocomposites obtained by the in situ polymerization of pyrrole in the presence of SDS (MMT/PPy.SDS) and without surfactant (MMT/PPy) were compared and evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis and the four-point probe method. The XRD patterns of the MMT/PPy composites shows that the d 001 spacing in MMT (1.42 nm) was changed to higher values, indicating the intercalation of PPy on MMT for both nanocomposites. The XRD pattern, SEM and TEM images of the MMT/PPy.SDS nanocomposites confirmed that the presence of SDS in the reaction medium promoted, beyond intercalation, the partial exfoliation of the clay. The MMT/PPy.SDS nanocomposites showed electrical conductivity (9.50 S/cm) higher than the MMT/PPy nanocomposites (4.44 S/cm). The presence of the clay significantly improved the thermal stability of PPy.

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The effects of dye dopants on the conductivity and optical absorption properties of polypyrrole

Cited by 102 publications

References 46 publications

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Novel conductive polypyrrole/zinc oxide/chitosan bionanocomposite: synthesis, characterization, antioxidant, and antibacterial activities

Enhanced Electrocatalytic Performance of Anthraquinonemonosulfonate‐Doped Polypyrrole Composite: Electroanalysis for the Specific Roles of Anthraquinone Derivative and Polypyrrole Layer on Oxygen Reduction Reaction

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

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