Optical properties of polyaniline

Huang, Wu‐Song; MacDiarmid, Alan G.

doi:10.1016/0032-3861(93)90424-9

Cited by 493 publications

(351 citation statements)

References 54 publications

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“…Since polyaniline has characteristic photocatalytical properties 22 , having a conducting band in the visible region which is activated by solar radiation 23 , some kind of synergic relationship could arise when PANI is used as part of a organic/ inorganic mixed material. In this direction, inorganic matrices such many metal oxides, which exhibit a very wide range of electrical resistivity 24 with catalytical 25 or photocatalytical properties 26,27 have been explored.…”

Section: Introductionmentioning

confidence: 99%

Effect of adsorbed polyaniline on the thermal stability of iron and arsenic oxides

Farias¹

2000

Quím. Nova

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Section: Introductionmentioning

confidence: 99%

Effect of adsorbed polyaniline on the thermal stability of iron and arsenic oxides

Farias¹

2000

Quím. Nova

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“…645 to ca. 763 and 778 nm, respectively for DCA and TCA, upon doping the PAni solution are attributed to the formation of the polaronic band in emeraldine salt 21,22 .…”

Section: Resultsmentioning

confidence: 95%

“…These undoped PAni spectra present bands which are characteristic of PAni in the leucoemeraldine base oxidation state. Two bands are observed at 329-335 nm and at 645 nm attributed to the π-π* transitions in the aromatic rings of benzene and to the charge transfer between quinoid and benzenoid rings [22][23][24] , respectively. The polymer doped by the addition of DCA or TCA to the solution of NMP presents a color change from dark blue to green and the characteristic bands at 320-350, 420-430 and 760-780 nm 25,26 associated to the conducting form, i.e.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of polyaniline electrosynthesized in propylene carbonate medium in the presence of di- and trichloroacetic acids

Venâncio¹,

Mattoso²,

Motheo³

2001

J. Braz. Chem. Soc.

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No presente trabalho a caracterização de polianilina eletrosintetizada em meio de carbonato de propileno na presença dos ácidos di-e tricloroacéticos foi realizada usando diferentes técnicas. A resposta eletroquímica por voltametria cíclica mostrou os processos redox devido à formação de polaron e bipolaron e à degradação do polímero. A caracterização usando as espectroscopias no infravermelho e ultravioleta-visível indica que os polímeros estão na forma de sal emeraldina com ânions perclorato incorporados. Os filmes produzidos com ambos os ácidos em carbonato de propileno apresentam morfologia compacta como observado por microscopia eletrônica de varredura. Através de testes de filmes de polianilina produzidos em condições selecionadas em um ambiente correspondente a uma bateria de lítio foi observado que estes apresentam uma eficiência coulômbica elevada promissora para aplicações em baterias.In the present work the characterization of polyaniline electrosynthesized in propylene carbonate medium in the presence of di-and trichloroacetic acids was performed using different techniques. The electrochemical response by cyclic voltammetry showed redox processes due to the formation of polaron and bipolaron and polymer degradation. The characterization by infrared and UVvisible spectroscopies indicated that the polymers are in the emeraldine salt form with perchlorate anions incorporated. The films produced with both acids in propylene carbonate media presented a compact morphology as observed by scanning electron microscopy. By testing the polyaniline film produced in selected conditions in a lithium battery environment it was found that it presents a high coulombic efficiency, promising for battery applications.

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“…The second peak (373 nm) is associated with polyaniline in state of emeraldine assigned to π→π* excitation of the substituted benzenoid ring. 44,45 Effect of the host in the polymerization kinetic of aniline and molecular weight of polyaniline Polymerization of aniline mediated by APS is an exothermic process and protons are produced, increasing the acidity in the reaction medium. Thus, the polymerization reaction was followed by the temperature and pH changes, in function of the presence of the host in the reaction system (Figure 9).…”

Section: Figure 7 Ftir Of (A) S (B) P-s (C) Ani-s (D) S-al (E) Amentioning

confidence: 99%

Polymerization of Aniline in Different Sba-16 Silica Hosts

Giraldo¹,

Vélez²,

Mesa³

2016

Química Nova

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publicado na web em 06/06/2016Polyaniline-silica composites made with mesoporous silica have been reported to improve the mechanical properties of the free polymer. However, there are not many studies about the effect of the chemical and physical properties of the inorganic material used as hosts over the final properties of polyaniline and the composites. Here, polyaniline-silica composites, exhibiting electrical conductivity, were synthesized using different types of SBA-16 mesoporous silica as hosts. The effects of the characteristics of the hosts in the polymerization kinetic, molecular weight and electrical conductivity of the final polymer were studied. The composites showed higher electrical conductivity in comparison with polyaniline synthesized under similar conditions of this work but in the absence of silica. The use of silica allowed to obtain composites with defined morphology, which did not occur in the absence of these hosts. From the results of this work, it can be concluded that SBA-16 mesoporous silica hosts have a bifunctional role in the formation of polyaniline-silica composites: the hosts behaved like nucleation sites, which favors polymerization of high molecular weight polyaniline and they catalyzed the polymerization reaction, especially when aluminum is present in the structure of the host.

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Optical properties of polyaniline

Cited by 493 publications

References 54 publications

Effect of adsorbed polyaniline on the thermal stability of iron and arsenic oxides

Effect of adsorbed polyaniline on the thermal stability of iron and arsenic oxides

Characteristics of polyaniline electrosynthesized in propylene carbonate medium in the presence of di- and trichloroacetic acids

Polymerization of Aniline in Different Sba-16 Silica Hosts

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