Decoration of nanocarbon supports with magnetic nanoparticles for the control of electromagnetic propagation
(2019)
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- Abstract
- Nowadays, low-power microwaves (2 to 40 GHz) are ubiquitously used for wireless data communication. Their extensive use in everyday life has led to growing concern about device malfunctioning due to electromagnetic (EM) interference, possible threats to human health or transmitted data security, among other issues. Consequently, highly efficient EM shielding materials based on broadband microwave absorption are being actively sought after. In this study, novel microwave absorber nanocomposites were prepared by decorating nanocarbon supports (NcS) with ferro- and ferrimagnetic nanoparticles (MNPs). The employed synthetic techniques were finely tuned to vary and master the deposited MNPs composition, size, loading rate and spatial distribution over the NcS, as well as the oxidation state of the latter. A novel nanopowder EM-characterization technique was also developed to study the impact of these physicochemical variations on the nanocomposites ability to modify microwave propagation. Finally, some of these nanocomposites were used to fabricate two novel microwave absorber material (MAM) prototypes. On the one hand, flexible, thin films were prepared by dispersing the chosen nanocomposites into a polycarbonate matrix. On the other hand, two types of nanocomposite water-based inks were formulated to print a series of planar frequency-selective-surfaces (FSS) onto a polycarbonate substrate. Both prototypes efficiency as broadband MAMs was evaluated, paving the way towards novel EM shielding functionalities.
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Citations
Mederos Henry, F. (2019). Decoration of nanocarbon supports with magnetic nanoparticles for the control of electromagnetic propagation. https://hdl.handle.net/2078.5/90566