Preparation and properties of cobalt oxides coated carbon fibers as microwave-absorbing materials

Enhanced microwave absorbing properties and heat resistance of carbonyl iron by electroless plating Co

“…The minimum reflection loss can reach À 27.8 dB with the thickness of 1.7 mm, and the bandwidth below À 10 dB can reach 3.9 GHz and 3.78 GHz for the thickness of 1.8 mm and 1.9 mm, respectively. The good absorbing properties are ascribed to the exchange coupling interaction at the interface of two magnetic phases (Co shell and CI core), and the interface polarization and multiple scatter [16]. For C3, the high dielectric loss and magnetic loss compared with C1 and C2 would enhance the absorbing properties; similar results have been reported by Pan et al study [15].…”

“…The real part of permeability decreases from 1.46 to 1.44 and the imaginary part of permeability increases from 0.61 to 0.68, which has the same tendency as C2 compared with C1. According to early report [15], annealing at temperatures in the range of 350-500°C would increase the saturation magnetization, which was accompanied by appearance of Co 2 P. Although we do not observe clear Co 2 P peak in our XRD data, one can suppose that this phase does form together with pure Co [15] and also the interaction between the Co layer and CI core becomes stronger after heat treatment, thus has high saturation magnetization [16]. Therefore, both the dielectric loss and magnetic loss of C3 are higher than that of C2 after heat treatment as shown in Fig.…”

Synthesis and characterization of hybrid conducting composites based on polyaniline/magnetite fillers with improved microwave absorption properties

“…The high proliferation of electronic instruments especially in the telecommunication area causes electromagnetic interferences (EMI) and disturbs the effective performance of electronic or electrical circuits in military and civil uses [1,2]. To assume the safety operation of electronic devices, standard rules are imposed to the designers of electronic equipments to protect those against the aggression of electromagnetic waves.…”

Engineering carbon fibers with dual coatings of FeCo and CuO towards enhanced microwave absorption properties

“…Therefore, carbon materials such as CNTs, graphenes, and CFs are generally combined with magnetic materials (such as magnetic metals and oxides) to produce various hybrids. For instance, CFs are often hybridized with Fe 3 O 4 [17,18], CoO x [19], FeCo alloy [20,21], and CuO [22]. Furthermore, dual coatings on CFs have also been reported and better EM wave absorption has been demonstrated as compared to those CFs with a sole coating [22,23].…”