Controllable preparation and broadband high-frequency absorption capabilities of Co fibers and Co/Cu bimetallic core-shell fibers

Construction of a Cu–Sn Heterojunction Interface Derived from a Schottky Junction in Cu@Sn/rGO Composites as a Highly Efficient Dielectric Microwave Absorber

“…56,57 There are a small number of Cu on the surface of Sn, which can enhance the plasmon resonance effect. 58 Last, the rGO sheets provide the active sites for the reflection and scattering of incident EMW. In the meantime, the adjacent rGO sheets can form a capacitive structure, which also contributes to polarization in the EM field.…”

“…First of all, strong interfacial polarization is generated due to the different resistivities between Cu and Sn. Second, the metal–dielectric structure (Cu@Sn-rGO) can produce plasmon resonance and coupling, leading to an increase in the dielectric constant. , There are a small number of Cu on the surface of Sn, which can enhance the plasmon resonance effect . Last, the rGO sheets provide the active sites for the reflection and scattering of incident EMW.…”

In situ generated gas bubble-directed self-assembly of multifunctional MgO-based hybrid foams for highly efficient thermal conduction, microwave absorption, and self-cleaning

“…In addition, new peaks are observed at 665 and 560 cm À1 for MgO/ Co/C foams and Co/C composites, corresponding to the stretching vibrations of the Co-O bond. 32 For MgO/Mg(OH) 2 /C foam, a strong peak located in 3701 cm À1 corresponds to the vibration of Mg-OH, which is caused by the presence of Mg(OH) 2 . 33 In what follows, Fig.…”

Co/CeO2/C composites derived from bimetallic metal–organic frameworks for efficient microwave absorption

“…5b, the tan δ ε curves rise with increasing pyrolysis temperature, indicating an enhancement of lossy ability. According to the Debye theory, the relationship between the real and imaginary parts of the dielectric constant can be described using the following eqn (3): 54 where ε ∞ represents the optical frequency permittivity and ε s is the static permittivity. In general, dielectric loss consisting of polarization loss and conductive loss can be described by the Debye theory, in which the ε′′ – ε ′ curve presents a semicircle, defined as a Cole–Cole semicircle, indicating a Debye relaxation process.…”