Abstract
Traditional magnetic metal and alloy materials suffer from easy oxidation and high density, which hinders their practical application as high-performance microwave absorbers. Lightweight and durability have become new goals in the fabrication of the next generation of microwave absorbers. Herein, we report the synthesis of polypyrrole (PPy) nanosphere/reduced graphene oxide (rGO) composites through chemical reduction of self-assembly PPy nanosphere/GO hybrids. PPy nanospheres and GO are integrated effectively by π–π interaction of dual conjugated systems. When the mass ratio of PPy nanospheres to rGO is 0.6:1, the resultant composite, PPy/rGO-0.6, presents comparable/superior reflection loss characteristics to those magnetic metals and their related graphene-based composites in previous studies. Electromagnetic analysis reveals that well-matched characteristic impedance, multiple polarization loss, and good conductivity loss are, together, responsible for the excellent microwave absorption performance of PPy/rGO-0.6. More importantly, PPy/rGO-0.6 also exhibits good microwave absorption after being treated at 423 K for a long time. This work provides a new idea for designing and preparing a high-performance microwave absorber with lightweight and durable features.
Highlights
Due to the explosive development and popularization of communication devices and computer networks in the past decades, a large amount of electromagnetic (EM) waves have been released into the living environment of mankind, evolving into a serious EM pollution issue that is placing social development and human health in danger [1,2,3,4]
The pH values of PPy nanosphere and graphene oxide (GO) suspensions are 6.62 and 2.35, and their corresponding zeta potentials are −42.4 and −35.0 mV, respectively. These results indicate that both PPy nanosphere and GO are negatively charged in their suspensions
The integrations of PPy nanospheres and reduced graphene oxide (rGO) with different mass ratios have been by N2 H4 ·H2 O
Summary
Due to the explosive development and popularization of communication devices and computer networks in the past decades, a large amount of electromagnetic (EM) waves have been released into the living environment of mankind, evolving into a serious EM pollution issue that is placing social development and human health in danger [1,2,3,4]. Numerous efforts have been devoted to developing microwave absorbers with a powerful absorption ability in a wide frequency band, to alleviate the negative effects of EM waves [5,6]. Magnetic metals and their alloy nanopowders are one kind of the most promising candidates for high-performance microwave absorbers because of their compatible magnetic loss and dielectric loss, as well as high Snoek’s limit in gigahertz range [7]. Polymers 2018, 10, 998 strong magnetic loss characteristics and good microwave absorption. Easy oxidation and high density of these magnetic materials have, so far, hindered their practical application to some extent. Developing novel and high-performance microwave absorbers with the features of being lightweight and durable still remains a challenge in the field of microwave absorption
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