Ultrasonic Irradiation:  A Novel Approach To Prepare Conductive Polyaniline/Nanocrystalline Titanium Oxide Composites

Xia, Hesheng; Wang, Qi

doi:10.1021/cm0109591

Cited by 462 publications

(213 citation statements)

References 15 publications

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“…Broad absorption in the NIR region (B750 to 1000 nm) in the as-fabricated device includes mixed contributions from the bipolaronic states of PEDOT 31 and the p-polaron transitions in oxidized PANI. 30 The intense absorption in the 590-600 nm range, is due to p-p* transitions of PEDOT, 31 with a maximum at E = À1.5 V and its intensity declines at higher negative potentials and the same holds true for the PEDOT-PB device. It is possible that no-more electrochemically addressable sites are left in the active electrode film (be it PEDOT or PANI or PB) for the electrolyte ions to have access to, and therefore the additional inserted/extracted charge produced at high reducing voltages of À1.75 and À2.0 V (applied to PEDOT as working electrode, PB/PANI are counter electrodes) can trigger degradative effects and, as a consequence, absorption is quenched at these high potentials.…”

Section: Spectroelectrochemistrymentioning

confidence: 90%

“…5a) confirms that the as-deposited PANI film is in the green emeraldine-salt form: the widely-known conducting form. This peak originates from radical cations, more specifically due to the polaron-p* transitions, 30 and shows a maximum value at E = À0.5/À0.75 V, and is retained in the coloration efficiency plot as well. High doping levels in polyaniline are usually responsible for this peak and here, the compact coil conformation of PANI, realized in the form of fiber like shapes ( Fig.…”

Section: Spectroelectrochemistrymentioning

confidence: 99%

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Electrochemistry of poly(3,4-ethylenedioxythiophene)-polyaniline/Prussian blue electrochromic devices containing an ionic liquid based gel electrolyte film

Deepa

Awadhia

Bhandari

2009

Phys. Chem. Chem. Phys.

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Electrochromic devices based on poly(3,4-ethylenedioxythiophene) (PEDOT) as the cathodic coloring electrode and polyaniline (PANI) or Prussian blue (PB) as the counter electrode containing a highly conductive, self-supporting, distensible and transparent polymer-gel electrolyte film encapsulating an ionic liquid, 1-butyl-1-methylpyrrolidiniumbis-(trifluoromethylsulfonyl)imide, have been fabricated. Polarization, charge transfer and diffusion processes control the electrochemistry of the functional electrodes during coloration and bleaching and these phenomena differ when PEDOT and PANI/PB were employed alternately as working electrodes. While the electrochemical impedance response shows good similitude for PEDOT and PANI electrodes, the responses of PEDOT and PB were significantly different in the PEDOT-PB device, especially during reduction of PB, wherein the overall amplitude of the impedance response is enormous. Large values of the coloration efficiency maxima of 281 cm 2 C À1 (l = 583 nm) and 274 cm 2 C À1 (l = 602 nm), achieved at À1.0 and À1.5 V for the PEDOT-PANI and PEDOT-PB devices have been correlated to the particularly low magnitude of charge transfer resistance and high polarization capacitance operative at the PEDOT-ionic liquid based electrolyte interface at these dc potentials, thus allowing facile ion-transport and consequently resulting in enhanced absorption modulation. Moderately fast switching kinetics and the ability of these devices to sustain about 2500 cycles of clear-to-dark and dark-to-clear without incurring major losses in the optical contrast, along with the ease of construction of these cells in terms of high scalability and reproducibility of the synthetic procedure for fabrication of the electrochromic films and the ionic liquid based gel electrolyte film, are indicators of the promise these devices hold for practical applications like electrochromic windows and displays.

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Section: Spectroelectrochemistrymentioning

confidence: 90%

Section: Spectroelectrochemistrymentioning

confidence: 99%

Electrochemistry of poly(3,4-ethylenedioxythiophene)-polyaniline/Prussian blue electrochromic devices containing an ionic liquid based gel electrolyte film

Deepa

Awadhia

Bhandari

2009

Phys. Chem. Chem. Phys.

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“…18) In this study, we report a simple approach to obtain photocatalytic PANI nanofiber/TiO 2 nanoparticles hybrids. The flexible strategy to achieve high dispersion state of the hybrid is based on the surface charge by the layer-by-layer (LbL) selfassembly method.…”

Section: )5)mentioning

confidence: 99%

Synthesis and characterization of polyaniline nanofiber/TiO2 nanoparticles hybrids

Prastomo

Ayad

Kawamura

et al. 2011

J. Ceram. Soc. Japan

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The hybridization of polyaniline (PANI) and TiO 2 leads to unique materials, which exhibit the enhancement of photocatalytic properties. Further improvement requires high dispersion state of TiO 2 in the hybrid. In this study, highly dispersed PANI nanofiber/TiO 2 nanoparticles hybrids were obtained by modifying the surface charge of TiO 2 nanoparticles via layer by layer (LbL) technique. The structural studies of the hybrids confirmed the presence of PANI along with anatase TiO 2 nanoparticles. The degradation of methylene blue (MB) in an aqueous solution under visible light irradiation was carried out to study the photocatalytic activity of the hybrids. The hybridization of PANI nanofiber and TiO 2 nanoparticles resulted in an enhancement of photocatalytic activity for visible light.

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“…By this way, a great number of nanocomposites between conducting polymers and nanoparticles of different oxides as TiO 2 , Fe 2 O 3 and SnO 2 have been described. [26][27][28][29][30][31][32][33] Several reports involving the synthesis and characterization of different polypyrrole or polyaniline/TiO 2 hybrids have been described aiming to obtain materials that find applications in electrochromic devices, nonlinear optical systems, photoelectrochemical devices etc. 29,[34][35][36][37][38] For 379 Organic/Inorganic Hybrid Materials Formed From TiO 2 Nanoparticles and Polyaniline Vol.…”

Section: Introductionmentioning

confidence: 99%

“…26,30,33,34,39 The experimental procedure is fundamental to control the properties of the resulting material. Variables like size and shape of the oxide particles, degree of the dispersion, kind of interaction and interface between the organic and the inorganic phases, among others, have direct influence on properties like conductivity, piezoresistivity, photocurrent, etc.…”

mentioning

confidence: 99%

Organic/inorganic hybrid materials formed from TiO2 nanoparticles and polyaniline

Schnitzler¹,

Zarbin²

2004

J. Braz. Chem. Soc.

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Este artigo descreve a síntese e caracterização de diferentes híbridos orgânico/inorgânicos formados entre a polianilina e o óxido de titânio. O método de preparação é baseado no processo sol-gel, partindo do isopropóxido de titânio como precursor. Duas rotas sintéticas visando a obtenção dos híbridos foram utilizadas, baseadas na mistura da anilina no meio reacional antes ou após a formação do óxido. Diferentes quantidades de anilina foram utilizadas visando compreender este efeito nas características do material final formado. As amostras foram caracterizadas por análise térmica, difratometria de raios-X, espectroscopias Raman, UV-Vis em modo refletância difusa e IV-TF, além de voltametria cíclica. Os resultados indicaram que os diferentes procedimentos experimentais foram bem sucedidos na obtenção de híbridos formados por nanopartículas de TiO 2 (estrutura anatase) e polianilina em sua forma condutora, sal esmeraldina. Não foram detectadas grandes diferenças entre as amostras obtidas através das duas rotas sintéticas utilizadas, exceto pela quantidade de polímero formada nos materiais. This paper describes the synthesis and characterization of organic/inorganic hybrid materials formed from TiO 2 nanoparticles and polyaniline (PANI). The preparation method is based on a solgel technique using titanium tetra-isopropoxide as oxide precursor, and two synthetic routes to the hybrids formation were employed, based on the addition of aniline after or before the sol formation. Different amounts of aniline were used to verify this effect on the characteristics of the formed materials. Samples were characterized by electronic spectroscopy, Raman spectroscopy, Fourier transformed infrared spectroscopy, thermal analysis, X-ray diffractometry and cyclic voltammetry. Results show that the different experimental routes are successful to produce hybrids formed by oxides nanoparticles and polyaniline in its conducting form, the emeraldine salt. There are no strong differences between the samples obtained by the two synthetic routes employed, except by the amount of polymer in the final material. Keywords: sol-gel method, polyaniline, nanocomposites IntroductionInterest in the development of new inorganic/organic (nano)composites has grown in recent years due to a wide range of potential use of these materials.1-10 These hybrids constitute a class of advanced composite materials with unusual properties, which can be used in many fields such as optics, ionics, electronics, mechanics etc.One important class of hybrid materials is that in which the organic fraction is composed by conducting polymers, such as polyaniline (PANI) or polypyrrole. [11][12][13][14][15][16][17][18][19] The unique properties of hybrid materials become more pronounced when at least one of the fractions occurs in nanometric scale. Nanocomposites in which the polymer fraction occurs in nanometric scale can be obtained by the encapsulation of conducting polymers within void spaces of inorganic host matrices such as pores, cavities, tunnels, micelles and inte...

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Ultrasonic Irradiation: A Novel Approach To Prepare Conductive Polyaniline/Nanocrystalline Titanium Oxide Composites

Cited by 462 publications

References 15 publications

Electrochemistry of poly(3,4-ethylenedioxythiophene)-polyaniline/Prussian blue electrochromic devices containing an ionic liquid based gel electrolyte film

Electrochemistry of poly(3,4-ethylenedioxythiophene)-polyaniline/Prussian blue electrochromic devices containing an ionic liquid based gel electrolyte film

Synthesis and characterization of polyaniline nanofiber/TiO2 nanoparticles hybrids

Organic/inorganic hybrid materials formed from TiO2 nanoparticles and polyaniline

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