Optical, structural and fluorescence microscopic studies on reduced form of polyaniline: The leucoemeraldine base

Ram, Manoj K.; Mascetti, Giancarlo; Paddeu, Sergio; Maccioni, Elisabetta; Nicolini, Claudio

doi:10.1016/s0379-6779(97)81194-0

Cited by 47 publications

(31 citation statements)

References 22 publications

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“…25% in 25 days [40] and that PANI-EB deposited on Au plate transforms into PANI-ES after storage in ambient conditions during 7 days [41]. In the case of PANI-functionalized SWNTs which has been stored in air for 4 months, we can note that the Raman Fig.…”

Section: Resultsmentioning

confidence: 88%

See 1 more Smart Citation

Covalent functionalization of single-walled carbon nanotubes by aniline electrochemical polymerization

Baibarac¹,

Baltog²,

Godon³

et al. 2004

Carbon

104

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Section: Resultsmentioning

confidence: 88%

“…It is known that the intensity ratio of the bands at ca. $1592 and $1500 cm À1 can provide information on the degree of oxidation of the polymer [33,40]. This ratio, in the case of the curve 4 from Fig.…”

Section: Resultsmentioning

confidence: 99%

Covalent functionalization of single-walled carbon nanotubes by aniline electrochemical polymerization

Baibarac¹,

Baltog²,

Godon³

et al. 2004

Carbon

104

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“…Whereas the electrical conductivity of the different polyaniline variants has been and still is the subject of extensive investigation, through both fundamental and applied research studies, the photoluminescence properties of this family of materials is far less investigated [11][12][13][14][15][16][17][18]. Polyaniline exhibits photoluminescence only its most unstable, fully reduced form of leucoemeraldine [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Polyaniline exhibits photoluminescence only its most unstable, fully reduced form of leucoemeraldine [11,12]. This is due to the p-p⁄ transition of the benzenoid units, while quinonoid units act as excitation traps, quenching the photoluminescence produced by the benzenoid units, via intra-chain energy dissipation [13].…”

Section: Introductionmentioning

confidence: 99%

Inherently fluorescent polyaniline nanoparticles in a dynamic landscape

Dispenza

Sabatino

Chmielewska

et al. 2012

Reactive and Functional Polymers

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a b s t r a c tIn this paper we report for the first time on the emissive behavior of two polyaniline (PANI) nanoparticle systems produced via oxidative chemical polymerization in the presence of either poly(vinyl alcohol) (PVA) or chitosan as polymeric stabilizers in water. The emission from PANI nanoparticles is irreversibly quenched by an increase of pH of the suspending medium from acid to neutral (chitosan-PANI) or alkaline (PVA-PANI). Conversely, PANI nanorods synthesized in the same conditions of the above, but in presence of poly(N-vinyl pyrrolidone), is not emissive at any pH. The role of the polymeric surfactant as a soft template is key in controlling the morphology and the properties of the obtained PANI dispersions. FTIR, UV-Vis absorption and photoluminescence excitation (PLE) spectra studies suggest that the emissive properties are related to the establishment of strong, non-covalent interactions between nanoscalar PANI particles and the polymeric surfactant at the pH of synthesis. Morphology examination of the three systems, by both dynamic light scattering (DLS) and Transmission Electron Microscopy (TEM), reveal that photoluminescence is associated to the presence of a genuinely 3D nanoscalar morphology, together with an ordered disposition of PANI chains into aligned crystal planes. Concomitant to the irreversible quenching of the emission signal with increasing pH, there is an evolution of the morphology leading to particle coalescence, coarsening and ultimately phase-separation, with consequent modification of PANI-polymeric surfactant interactions, PANI chains supra-molecular organization and optical properties of the PANI nanoparticles dispersion.

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“…leading to a number of proposed applications such as sensors, displays and other optoelectronic devices [1][2][3][4][5][6][7][8][9]. Aryl amine polymers, such as polyaniline (PANI), show photoluminescence in their reduced state, which decreases when the polymer is oxidized [10][11][12][13][14]. Even when the quantum yield is small, the study of these properties is interesting because it will give insight into the electronic structure of these materials.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence of polyaniline films on platinum surfaces. Influence of redox state and conductive domains

Antonel

Molina

Andrade

2007

Journal of Electroanalytical Chemistry

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Optical, structural and fluorescence microscopic studies on reduced form of polyaniline: The leucoemeraldine base

Cited by 47 publications

References 22 publications

Covalent functionalization of single-walled carbon nanotubes by aniline electrochemical polymerization

Covalent functionalization of single-walled carbon nanotubes by aniline electrochemical polymerization

Inherently fluorescent polyaniline nanoparticles in a dynamic landscape

Fluorescence of polyaniline films on platinum surfaces. Influence of redox state and conductive domains

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