Abstract
To clear away the harmful effects of the increment of electromagnetic pollution, high performance absorbers with appropriate impedance matching and strong attenuation capacity are strongly desired. In this study, a chain-like PPy aerogel decorated with MOF-derived nanoporous Co/C (Co/C@PPy) has been successfully prepared by a self-assembled polymerization method. With a filler loading ratio of 10 wt %, the composite of Co/C@PPy could achieve a promising electromagnetic absorption performance both in intensity and bandwidth. An optimal reflection loss value of −44.76 dB is achieved, and the effective bandwidth (reflection loss lower than −10 dB) is as large as 6.56 GHz. Furthermore, a composite only loaded with 5 wt % Co/C@PPy also achieves an effective bandwidth of 5.20 GHz, which is even better than numerous reported electromagnetic absorption (EA) materials. The result reveals that the as-fabricated Co/C@PPy—with high absorption intensity, broad bandwidth, and light weight properties—can be utilized as a competitive absorber.
Highlights
The utilization of electromagnetic waves has been expanded extensively in both civilian and military fields, yet it generates potential hazards on the performance of sophisticated electronic devices and biological immune systems of human beings and wildlife [1,2,3,4]
The multiple reflection in the matrix and the interfacial polarization induced by the interfaces between Co, C, PPy, paraffin matrix and air bubbles play a significant role in enhancing the electromagnetic absorption (EA) property
A chain-like structured PPy aerogel decorated with MOF-derived nanoporous Co/C
Summary
The utilization of electromagnetic waves has been expanded extensively in both civilian and military fields, yet it generates potential hazards on the performance of sophisticated electronic devices and biological immune systems of human beings and wildlife [1,2,3,4]. Traditional absorbers are mainly composed of ferromagnetic metals [8], carbon [9], and conducting polymers materials [10]. Ferromagnetic metals are susceptible to corrosion, and are high density with insufficient bandwidth [11]; the high conductivity of the pure carbon and conducting polymers materials always induce an eddy current effect and reflection [12]. Taking polypyrrole (PPy) as an example, it is Materials 2018, 11, 781; doi:10.3390/ma11050781 www.mdpi.com/journal/materials
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