Polyaniline–MWCNT nanocomposites for microwave absorption and EMI shielding

Multi-walled carbon nanotube–graphene–polyaniline multiphase nanocomposite with superior electromagnetic shielding effectiveness

“…12,13 However, the percolation threshold of PANI is high because of low compatibility and low aspect ratio of the conducting polymer. 14 The drawback of low electric conductivity and low specic strength restricts its application as EMI shielding material.…”

“…During the past decade, improvements in EMI shielding effectiveness (SE) have been achieved by introducing carbon materials, such as carbon black, carbon ber, exfoliated graphite, graphite, yash, carbon nanotubes (CNTs) and even now multilayer graphene. 12,[15][16][17][18][19] To improve the properties of the PANI, Saini et al 15 developed PANI based composite by in situ emulsion pathway technique with a different ratio of graphite and PANI. It is reported that by incorporating 15.6 wt% of graphite in PANI, the ultimate composite possesses electrical conductivity 12.5 S cm À1 and total EMI-SE is reached up to À33.6 dB in the X-band frequency region .…”

New strategies for the chemical characterization of multi-walled carbon nanotubes and their derivatives

“…The chemical (- conjugated system) and physical (high aspect ratio) structure of the carbon nanotubes leads to their principal advantages but also to their principal disadvantages, because these nanoparticles tend to remain highly aggregated and absorb electromagnetic waves across a wide spectrum. [7,8] It has been reported in several cases that the modification of the surface of the carbon nanotubes with functional groups can help to disperse them, and may lead to enhancement of mechanical properties and electrical conductivity in different matrices. [9][10][11][12][13][14][15][16][17][18][19][20][21] In the case of the preparation of polymer nanocomposites based on carbon nanotubes, various researchers have reported an improvement of the mechanical properties when covalently surfacemodified carbon nanotubes were used.…”

“…Compared with non-covalently functionalized CNTs, covalently functionalized ones can interact directly with the matrix system as the polymer bound to the CNT can transfer stress directly from the matrix to the CNT structure. [9,14,17,[22][23][24][25][26][27][28] However, the characterization of functionalized CNT is still difficult because of their high absorption of electromagnetic radiation across a broad spectrum [7,8]. This leads to a very low resolution for methods based on radiation like UV/Vis and IR spectroscopy.…”

Preparation of a nanocomposite of magnetic, conducting nanoporous polyaniline and hollow manganese ferrite

“…1,2 Nanostructured-conducting polymer composites have attracted significant scientific and technological interest because of their potential applications in various domains, for example, as microwave-absorbing materials and electromagnetic interference shielding. 3,4 Among conductive polymer composites, materials decorated with inorganic nanoparticles such as Al 2 O 3 , 5 g Fe 2 O 3 , 6 RuO 2 7 and TiO 2 8 have received a great deal of attention owing to possible interactions between inorganic nanoparticles and the polymeric matrix that may produce novel physical properties. Currently, there are many reports on the synthesis of composites containing PANi and magnetic oxides with various nanostructures, such as nanotubes, nanorods or core-shell nanostructures; [9][10][11] to the best of our knowledge, however, investigations on hollow or nanoporous composites have seldom been reported.…”