Jump to main content
Jump to site search


Realizing Significant Dielectric Dispersion of Composites Based on Highly Conducting Silver-Coated Glass Microsphere for Wide-Band Non-Magnetic Microwave Absorber

Abstract

Achieving broadband microwave absorption by non-magnetic thin coatings is quite challenging due to lacking of dielectric dispersion for most existing materials. In this work, significant microwave dielectric dispersion (SMDD) in a broad bandwidth has been realized by silver-coated glass microspheres (GM@AgCPs) as fillers at a near percolating volume fraction in composites. First, dense silver shells of GM@AgCPs is critical to enhance dielectric properties of composites at low frequency, owing to the strong interface polarization, oscillation resonance and coupling interaction. Second, GM@AgCPs exhibit long effective paths for electron oscillation, which results in long relaxation time. Therefore, the strong dielectric responses are not extended to high frequency because excited electrons on GM@AgCPs cannot respond rapidly to changes of external electromagnetic field, leading to significant microwave dielectric relaxation. Subsequently, high-performance microwave absorbing materials (MAMs) have been for the first time demonstrated by SMDD coupled with the quarter-wavelength resonance in a broad bandwidth. In consequence, the as-obtained MAMs with matching thickness of 2.2 mm at volume fraction (V) = 45 % exhibit an absorption bandwidth of at least 11.8 GHz for reflection loss ≤ - 8.0 dB, which greatly surpasses the performance of the literature-reported dielectric counterparts. Our work will promise important applications in electromagnetic compatibility and stealth.

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Jul 2018, accepted on 21 Nov 2018 and first published on 21 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC03594F
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
  •   Request permissions

    Realizing Significant Dielectric Dispersion of Composites Based on Highly Conducting Silver-Coated Glass Microsphere for Wide-Band Non-Magnetic Microwave Absorber

    K. Ren, Y. Wang, C. Ye, Z. Du, J. Bian, C. Long, S. Zhao, W. Li and J. Guan, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03594F

Search articles by author

Spotlight

Advertisements