Toward the Application of High Frequency Electromagnetic Wave Absorption by Carbon Nanostructures

Abstract

With the booming development of electronic information technology, the problems caused by electromagnetic (EMs) waves have gradually become serious, and EM wave absorption materials are playing an essential role in daily life. Carbon nanostructures stand out for their unique structures and properties compared with the other absorption materials. Graphene, carbon nanotubes, and other special carbon nanostructures have become especially significant as EM wave absorption materials in the high‐frequency range. Moreover, various nanocomposites based on carbon nanostructures and other lossy materials can be modified as high‐performance absorption materials. Here, the EM wave absorption theories of carbon nanostructures are introduced and recent advances of carbon nanostructures for high‐frequency EM wave absorption are summarized. Meanwhile, the shortcomings, challenges, and prospects of carbon nanostructures for high‐frequency EM wave absorption are presented. Carbon nanostructures are typical EM wave absorption materials being lightweight and having broadband properties. Carbon nanostructures and related nanocomposites represent the developing orientation of high‐performance EM wave absorption materials.

Hydrophilicity of electrospun microfibers of polyethylene oxide with semisoluble polyaniline for biological applications

“…Two absorption zones were identified, 200–350 and 350–850 nm corresponding to the UV and visible zones, respectively, see Figure 5. The lowest absorption was found in PEO (red lines) films with approximately the same absorption profile as their fibers, perhaps due to the higher surface of the fibers compared with the films 35–39 …”

“…The lowest absorption was found in PEO (red lines) films with approximately the same absorption profile as their fibers, perhaps due to the higher surface of the fibers compared with the films. [35][36][37][38][39] The highest absorption belonged to PANI with small variations in films and fibers. The highest peak of PANI films was in 197 nm, which was displaced in their fibers to 253 nm.…”

Synthesis of Single‐Component Metal Oxides with Controllable Multi‐Shelled Structure and their Morphology‐Related Applications

“…Magnetic loss and dielectric loss are the main electromagnetic wave consuming mechanisms. The electromagnetic wave adsorption performance is generally evaluated by the reflection loss (RL) value based on the transmission line theory . RL can be calculated according to following equations:…”

Defect Induced Polarization Loss in Multi‐Shelled Spinel Hollow Spheres for Electromagnetic Wave Absorption Application

“…In recent years, development of efficient electromagnetic (EM) wave absorbing materials to eliminate excessive EM wave interfere has caused great research attention. [1][2][3][4][5][6][7][8][9] Co-based spinel structured metal oxides are regarded as prospective candidates as effective EM wave absorbing materials. To date, a series of DOI: 10.1002/advs.202004640 MCo 2 O 4 (M = Fe, Ni, Mn, etc.)…”