Polyaniline nanocomposites with negative permittivity

Abstract

In this review, the fundamentals of negative permittivity are critically discussed. Current research on polyaniline and its nanocomposites with negative permittivity are presented in detail. The reasons why these unique materials show negative permittivity are analyzed. This knowledge will be useful for future metacomposite design and manufacturing. These polymeric materials with negative permittivity are envisioned to create next-generation left-hand media for cloaking, subwavelength imaging, stealth, and invisibility applications.

Highly Monodisperse Sub‐microspherical Poly(glycidyl methacrylate) Nanocomposites with Highly Stabilized Gold Nanoparticles

“…The real permittivity of the PGMA@PAH@AuNPs composites is much higher than that of pure PGMA spheres. With their lower bandgap value, the PGMA@PAH@AuNPs have a strong potential to expand the applications of polymer nanocomposites in sensors, semiconductive devices, or catalysts …”

Statistical Study of the Influence of CNTs Purification and Plasma Functionalization on the Properties of Polycarbonate-CNTs Nanocomposites

“…The nanometric size and the structure, consisting of only carbon–carbon covalent bonds, make them one of the most interesting materials in nanotechnology field . CNTs main applications include the use as field emitters, nanoprobes, and sensors, fillers for polymeric, ceramic, and metallic composites . For some of these potential applications, as‐prepared CNTs need to be purified, removing carbonaceous by‐products (amorphous carbon, graphene, fullerenes) and catalyst residues.…”

Exploring the Effects of Argon Plasma Treatment on Plasmon Frequency and the Chemiresistive Properties of Polymer-Carbon Nanotube Metacomposite

“…Negative permittivity in metacomposites is considered to be the result of network formation of continuous conducting pathways that are capable of generating delocalized charges on a macroscopic scale [ 5 ]. The negative permittivity in such systems is commonly described by the Drude Model according to the following formula: [ 1 , 4 ] where f is the frequency of the applied electric field, f p is plasmon frequency and γ is the dissipation parameter. Additionally, the model derives a relationship between f p and the charge carrier density N : where m eff is the effective mass of the electron and e the electron charge.…”

“…In recent years, several reports have surfaced regarding various nanocomposite materials exhibiting a negative permittivity of significantly high magnitude [ 1 , 2 ]. As a result, the term metacomposites has been introduced to describe these unique nanocomposites with negative permittivity, which are promising candidates for applications such as super lenses, wave filters, remote aerospace applications, and superconductors.…”