Microwave absorption properties of 3D cross-linked Fe/C porous nanofibers prepared by electrospinning

Performance enhanced electromagnetic wave absorber from controllable modification of natural plant fiber

“…In general, two distinguishable peaks standing at 1340 and 1590 cm À1 are named as D band (A 1g carbon vibration modes) and G band (E 2g carbon vibration modes). 27,28 The D band usually associates with disorder carbon which contains vacancies, substitutional heteroatoms, amorphous carbon species, grain boundaries or any other defects, while the G band is subject to sp 2 -hybridized carbon bonds, which can be produced by all sp 2 sites in graphitic carbon. [29][30][31] The integrated intensity ratio of D band and G band (I D /I G ), acquired from an accurate calculation by integral peak area, is usually employed as a criterion to reect the graphitization degree of sample.…”

“…interfacial polarization, electronic polarization and atomic polarization (of course, here, interface polarization plays a major role). 13,27,32,44 This kind of relaxation is due to the fact that polarization cannot keep up with the rapidly changing of alternate electric eld in high frequency region. Usually, the higher the frequency is, the more distinct the relaxation phenomenon is, account for this, resonance relaxation peak occurs in the high frequency region.…”

Conductive Electrospun Nanofiber Mats

“…Typically, lightweight electromagnetic (EM) wave absorbers are prepared as heterogeneous structures from magnetic and dielectric loss materials, with the heterogeneous structure supporting the interaction between an electromagnetic wave and absorber [52]. This results in a strong use of combinations of magnetic loss materials like magnetic metals with dielectric loss materials like carbon in different modifications for the preparation of lightweight EM composite absorbers, as depicted in Figure 7 [53][54][55][56]. Nanofiber mats electrospun from other combinations such as ZnO/C are also reported to show good microwave absorption [57].…”

Biomass carbon derived from pine nut shells decorated with NiO nanoflakes for enhanced microwave absorption properties

“…In the past few decades, researchers have focused great attention on improving the absorption properties and broadening their absorption bandwidth. Carbon based materials (carbon nanotubes (CNTs), carbon nanocoils and graphene), [4][5][6][7][8] and transition metal related materials such as metal particles (Fe, Co, Ni and their alloys), [9][10][11][12][13] oxides and hydroxides (CoO, Co 3 O 4 , NiO, MnO 2 , Fe 2 O 3 , Fe 3 O 4 , Ni(OH) 2 , MnOOH, et al), [14][15][16][17][18][19] suldes (CuS, CoS) and phosphides (FeP, Co 2 P) [20][21][22] have demonstrated excellent microwave absorption properties at certain frequency band with an optimum thickness. However, due to its electromagnetic loss mechanism, a single absorbent can hardly achieve a better performance in a wider frequency range and usually can only be used in some certain frequency.…”