Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties

Gu, Hongbo; Huang, Yudong; Zhang, Xi; Wang, Qiang; Zhu, Jiahua; Shao, Lu; Haldolaarachchige, Neel; Young, David P.; Wei, Suying; Guo, Zhanhu

doi:10.1016/j.polymer.2011.12.033

Cited by 230 publications

(208 citation statements)

References 90 publications

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“…Conducting polymers, as one of irreplaceable organic materials, can be used in almost all emerging industries and modern high-tech fields. Among the extensive studies of conducting polymers involving polyaniline (PANI), polypyrrole (PPy) [11,12], and polythiophene (PT), PANI has attracted attention recently due to its ready availability, simple synthesis, excellent electrical and optical properties, magnetoresistance (MR) behaviors, and thermal stability [13][14][15][16]. However, large-scale application of PANI is limited except for improving its insolubility and infusibility.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Na¹

2015

Polymers

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Abstract:The synthesis procedure and dopant are crucial to the electrical conductivity, thermal stability, and solubility properties of polyaniline (PANI). In this paper, high-performance PANI was synthesized by means of chemical oxidative polymerization using anionic spherical polyelectrolyte brushes (ASPB) as dopant.The bonding structure, crystallographic structure, morphology, and thermal stability of the conductive nanocomposite were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermo-gravimetric analysis (TGA) respectively. Meanwhile, investigation on the electrical conductivity suggested that the room-temperature electrical conductivity of PANI doped with ASPB (PANI/ASPB) was 19.3 S/cm, which was higher than that of PANI (7.0 S/cm), PANI doped with poly(sodium-p-styrenesulfonate) (PSS) (PANI/PSS) (14.6 S/cm), PANI doped with SiO 2 (PANI/SiO 2 ) (18.2 S/cm), and PANI doped with canonic spherical polyelectrolyte brushes (CSPB) (PANI/CSPB) (8.0 S/cm). Meanwhile, the addition of ASPB improved the thermal stability and solubility properties of PANI. ASPB played the role of template. Conductive mechanism of PANI/ASPB nanocomposite can be explained by the theoretical models of three-dimensional variable range-hopping (3D VRH).

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Section: Introductionmentioning

confidence: 99%

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Na¹

2015

Polymers

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“…At this regard, given the outstanding interest gained by this class of organic/inorganic materials for applications in many fields, a wide range of resins including polystyrene [30], poly(vinyl alcohol) [31], poly(pyrrole) [32], polyaniline [33,34], and epoxy resins [35] has been already considered.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Magnetite Nanopowder: Synthesis, Characterization, and Preliminary Use as Filler of Polymethylmethacrylate Nanocomposites

Russo

Acierno

Palomba

et al. 2012

Journal of Nanotechnology

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Magnetite (Fe 3 O 4 ) nanoparticles prepared by microwave-assisted hydrothermal synthesis have been characterized in terms of morphological and structural features. Electron micrographs collected in both scanning (SEM) and transmission (TEM) modes and evaluations of X-ray powder diffraction (XRD) patterns have indicated the achievement of a monodispersed crystallite structure with particles having an average size around 15-20 nm. Structural investigations by Micro-Raman spectroscopy highlighted the obtainment of magnetite nanocrystals with a partial surface oxidation to maghemite (γ-Fe 3 O 4 ). Preliminary attention has been also paid to the use of these magnetite nanoparticles as filler for a commercial polymethylmethacrylate resin. Hybrid formulations containing up to 3 wt% of nanoparticles were prepared by melt blending and characterized by calorimetric and thermogravimetric tests. For sake of comparison, same formulations containing commercial Fe 3 O 4 nanoparticles are also reported. Calorimetric characterization indicates an increase of both glass transition temperature and thermal stability of the nanocomposite systems when loaded with the synthesized magnetite nanoparticles rather then loaded with the same amount of commercial Fe 3 O 4 . This first observation represents just one aspect of the promising potentiality offered by the novel magnetic nanoparticles when mixed with PMMA.

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“…The trace loss of MnO 2 between 500 and 700˝C is ascribed to the evolution of oxygen caused by the transformation from MnO 2 to Mn 2 O 3 [54]. Figure 5 reveals that the PANI/MnO 2 possesses a typical four-step decomposition, which emerges a larger weightlessness that is mainly due to the decomposition of PANI between 500 and 700˝C [55,56]. The weightlessness still existed when the temperature was increased to 1000˝C, which is due to the carbonization of PANI under nitrogen atmosphere.…”

Section: Tg and Dtg Analysismentioning

confidence: 99%

High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

Jiang

et al. 2015

Polymers

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Abstract:The PANI/Mesoporous MnO 2 composites were prepared through a simple one step method and we introduced the KI-H 2 SO 4 solution as the electrolyte of PANI/MnO 2 composites creatively. The characterization of structure, morphology, and composition are obtained by X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravity analysis, Raman spectra, and scanning electron microscope. The electrochemical performances were investigated by constant-current charge-discharge, the voltammetry curve, and alternating current (AC) impedance technique. The specific capacitance of composites is 1405 F/g, which is almost 10 times larger than MnO 2 (158 F/g). We also find that the iodide concentration is closely related to the specific capacitance. Therefore, we explored the specific capacitance at different iodide concentration (0.05, 0.1, 0.2, 0.5, and 1 M), the results indicated that the specific capacitance reached a maximum value (1580 F/g) at 0.5 mol/L. Additionally, the PANI/Mesoporous MnO 2 composites not only exhibited a good ratio discharge property (857 F/g) at high current density, but also revealed an excellent cycling stability after 500 cycles, which retained 90% of the original specific capacitance.

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Magnetoresistive polyaniline-magnetite nanocomposites with negative dielectrical properties

Cited by 230 publications

References 90 publications

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Polyaniline-Doped Spherical Polyelectrolyte Brush Nanocomposites with Enhanced Electrical Conductivity, Thermal Stability, and Solubility Property

Ultrafine Magnetite Nanopowder: Synthesis, Characterization, and Preliminary Use as Filler of Polymethylmethacrylate Nanocomposites

High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

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