Synthesis, characterization and microwave absorption property of doped polyaniline nanocomposites containing TiO2 nanoparticles and carbon nanotubes

Phang, Sook‐Wai; Tadokoro, Masato; Watanabé, Jirô; Kuramoto, Noriyuki

doi:10.1016/j.synthmet.2008.01.012

Cited by 128 publications

(60 citation statements)

References 34 publications

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“…Multi-wall carbon nanotubes (MWNT) with moderate magnetization (M S ) can be a potential candidate for this purpose. 19 Moreover, carbon nanotubes are known to possess exceptional mechanical, electrical and thermal properties, excellent electrical conductivities and high aspect ratio 20-23 that have made them very promising for high-tech applications. 24,25 By combining the good properties of MWNT and PANI and incorporation of a magnetic filler and dielectric matrix, the PANI/MWNT composites may possess synergetic effects.…”

Section: Introductionmentioning

confidence: 99%

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

et al. 2015

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Electrospinning of conductive polymer blends offers high potential to prepare novel materials for electronical applications. The main aim of this work is to fabricate poly(vinyl alcohol) (PVA), polyaniline (PANI), and multi walled carbon nanotubes (MWNT) composites in thin film and nanofiber layer structures and then compare their microwave absorption behavior. First, optimum ratios for blending PVA, PANI, Camphorsulfonic acid (CSA) and MWNT were obtained. Then under optimized ratios, composite solutions of PVA: PANI-CSA, and PVA/PANI-CSA/ MWNT were fabricated to nanofiber layer and thin film structures. Based on scanning electron microscope (SEM) micrographs, the PVA/PANI-CSA nanofiber samples at low content of PANI-CSA presented a very uniform surface and without any beads but some beads started to develop at higher PANI-CSA content. However, the SEM analysis of the PVA/PANI-CSA/MWNT films revealed the uniform appearance for all composites. But, some aggregation and local irregularities on the surface were observed due to the presence of MWNT in the composite structure. Microwave absorption behavior was evaluated using vector network analyzers in the frequency range of 8-12 GHz (X-band) for all samples. It was observed that absorption microwave properties of PVA/PANI-CSA nanofibers improved with increasing in the loading levels of PANI-CSA in the mixture. Microwave absorption properties of the PVA/PANI-CSA/MWNT composite nanofiber absorbers have been compared with thin films at various thicknesses by measuring the relative maximum reflection loss (dB/mm) of samples. The PVA/PANI-CSA/MWNT composite nanofibers with the layer thickness of 0.1 mm presented two remarkable absorbing peaks versus one absorbing peak in nanocomposite films with similar thickness. The relative maximum reflection loss in PVA/PANI-CSA/MWNT composite nanofiber has reached -230 dB/mm at frequency of 8.6 GHz which is nearly 8 times higher than -28 dB/ mm at frequency of 8.4 GHz for PVA/PANI-CSA/MWNT film samples.

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Section: Introductionmentioning

confidence: 99%

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

et al. 2015

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“…1(a). 10,11) However, nanoparticles with high specific surface energy agglomerates in polymer, and the dispersion of the nanoparticles has been the main difficulty. Also, fillermatrix bonding has to be considered to prevent the decrease in strength and ductility of the composite.…”

Section: )mentioning

confidence: 99%

Electrospun Magnetic Nanofiber as Multifunctional Flexible EMI-Shielding Layer and its Optimization on the Effectiveness

Yu¹,

Nam²,

Lee³

et al. 2016

Journal of the Microelectronics and Packaging Society

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We developed a flexible and micro-thick electromagnetic interference (EMI) shielding nanofabric layer that also functions as a water resisting and heat sinking material. Electrospinning followed by a simple heat treatment process was carried on to produce the EMI-shielding Ni/C hybrid nanofibers. The ambient oxygen partial pressure (pO 2 = 0.1, 0.7, 1.3 Torr) applied during the heat treatment was varied in order to optimize the effectiveness of EMI-shielding by modifying the size and crystallinity of the magnetic Ni nanoparticles distributed throughout the C nanofibers. Permittivity and permeability of the nanofibers under the electromagnetic (EM) wave frequency range of 300 MHz~1 GHz were measured, which implied the EMI-shielding effectiveness (SE) optimization at pO 2 = 0.7 Torr during the heat treatment. The materials' heat diffusivity for both in-plane direction and vertical direction was measured to confirm the anisotropic thermal diffusivity that can effectively deliver and sink the local heat produced during device operations. Also, the nanofibers were aged at room temperature in oxygen ambient for water resisting function.

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“…(10) and (13). Further it is predicted that the increased conductivity may manifest itself as increase in both long range charge transport as well as number of possible relaxation modes, leading to enhanced ohmic losses in the proposed electromagnetic shielding material (Phang et al 2008;Saini et al 2009). The total shielding effectiveness of -21 dB indicates that these materials could be utilized effectively for the shielding purposes in the .0 GHz).…”

Section: Conductivity Measurementsmentioning

confidence: 99%

Improved microwave shielding properties of polyaniline grown over three-dimensional hybrid carbon assemblage substrate

et al. 2014

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Novel composites were prepared by oxidative polymerization of aniline over hybrid carbon nanostructured assemblage consisting of graphene and amine functionalized multiwalled carbon nanotubes. The chemical structure of the obtained composites has been confirmed by UVvisible Spectroscopy and Fourier transform infrared spectroscopy. To know about the crystalline properties of the composites, X-ray diffraction studies have been done. The structural and morphological properties of the composites were examined by scanning electron microscopy. The composite having thinnest polymer film exhibited highest conductivity of 0.11 S/cm and maximum electromagnetic interference shielding effectiveness value of 21 dB obtained in the frequency range 12-18 GHz (KU-band).

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Synthesis, characterization and microwave absorption property of doped polyaniline nanocomposites containing TiO2 nanoparticles and carbon nanotubes

Cited by 128 publications

References 34 publications

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

Microwave absorption properties of polyaniline/poly(vinyl alcohol)/multi-walled carbon nanotube composites in thin film and nanofiber layer structures

Electrospun Magnetic Nanofiber as Multifunctional Flexible EMI-Shielding Layer and its Optimization on the Effectiveness

Improved microwave shielding properties of polyaniline grown over three-dimensional hybrid carbon assemblage substrate

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