Click here to view fulltext PDF

Permanent link:
https://www.ias.ac.in/article/fulltext/boms/040/02/0301-0306

Composite; absorption; reflection loss; dielectric; double layer.

Microwave-absorbing materials based on reduced graphene oxide (r-GO)/ strontium titanate were prepared by embedding in epoxy matrix. R-GO and strontium titanate were synthesized and characterized before composite fabrication. Microstructures of the constituent elements were studied by scanning electron microscopy and X-ray diffraction (XRD). Microwave absorption capabilities of the composite absorbers were investigated using a Vector Network Analyser in the range 8–12 GHz. A maximum reflection loss of $−$7.5 and $−$16.4 dB was obtained at 9.3 and 12.08 GHz, respectively, for 2% (w/w) r-GO-loaded epoxy composites. A maximum attenuation of $−$12.8 dB at 9.3 GHz was obtained for the strontium titanate/epoxy composite. However, double-layer composite with r-GO/strontium titanate/epoxy composition showed the maximum reflection loss of $−$15.1 dB at 9.47 GHz and $−$9.65 dB at 12.3 GHz. All the results are discussed in terms of complex permeability and permittivity. The study revealed that intrinsic conductivity and polarization of the r-GO particles and dielectric polarization of the strontium titanate within epoxy matrix contribute to the microwave absorption.

SUKANTA DAS^{1 2} S K SAHU² RAMESH ORAON¹ P C ROUTRAY² H BASKEY³ G C NAYAK¹

1. Department of Applied Chemistry, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad 826004, India
2. Integrated Test Range (ITR), Chandipur 756025, India
3. DMSRDE, Kanpur 208013, India

Published

15 April 2017

Manuscript received

8 October 2015

Accepted

2 July 2016