Enhanced luminescence observed in polyaniline–polymethylmethacrylate composites

Amrithesh, M.; Aravind, S. S. Jyothirmayee; Jayalekshmi, S.; Jayasree, Ramapurath S.

doi:10.1016/j.jallcom.2006.02.096

Cited by 50 publications

(41 citation statements)

References 9 publications

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“…The lower conductivity of pure PANI is due to its amorphous nature as indicated in XRD pattern. The crystalline nature of silver particles forms ordered structure in the composite films, which permits improved electrical transport [46,47]. Figure 3 shows the cyclic voltametry curves of I À 3 =I À redox couple on the CEs.…”

Section: Conductivity Of Silver/pani Compositementioning

confidence: 99%

Simple and inexpensive electrodeposited silver/polyaniline composite counter electrodes for dye-sensitized solar cells

et al. 2014

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Silver and polyaniline (Ag/PANI) composite counter electrodes (CEs) have been prepared by electrochemical polymerization on stainless steel substrate using different silver (Ag) concentrations for dye-sensitized solar cells (DSSC). The effect of Ag concentration on the properties of fabricated Ag/PANI composite CEs, such as morphology, electrical conductivity, oxidation and reduction potential, and electrochemical activity of I 3 -reduction, is investigated. Highest cathodic current density (3.4 mA), low charge transfer resistance (2.15 X), and good electrocatalytic activity of I À 3 =I À redox couple for CE are obtained at 0.07 M concentration of silver in Ag/PANI composite. DSSC based on this CE shows best photovoltaic performance with conversion efficiency up to 7.31 %. This study indicates that the Ag/PANI composite prepared electrochemically is possible substitute of the expensive Platinum as CEs for DSSCs.

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Section: Conductivity Of Silver/pani Compositementioning

confidence: 99%

Simple and inexpensive electrodeposited silver/polyaniline composite counter electrodes for dye-sensitized solar cells

et al. 2014

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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%

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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“…The peaks at 1587 and 1496 cm -1 are assigned to the stretching vibration of C = N in quinoid ring and C = C in benzenoid ring [27]. The peak at 3268 cm -1 is attributed to the N-H stretching vibration in PANI [27]. However, compared with the spectrum of the PANI, the peaks of the CNTs/ PANI/Fe 3 O 4 multiphase heterostructures shifted slightly in the direction of low wave number.…”

Section: Resultsmentioning

confidence: 93%

“…For the CNTs/PANI/Fe 3 O 4 multiphase heterostructures, the peaks appearing at 3268, 1587, 1496, 1310, 1165, and 832 cm -1 indicate the formation of PANI. The peaks at 1587 and 1496 cm -1 are assigned to the stretching vibration of C = N in quinoid ring and C = C in benzenoid ring [27]. The peak at 3268 cm -1 is attributed to the N-H stretching vibration in PANI [27].…”

Section: Resultsmentioning

confidence: 99%