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Research Article Open Access

Cage type catalysts, kaolin, organic template, hydrothermal, ultrasonic synthesis.

Avanish K. Srivastava, Bhumika Samaria, Smita Soni, Virendra S Chauhan, Jitendra Singh,  Rajesh K Shukla, Anuj Shukla, Narendra Kumar*

 

 

Material Development Group, Defence Laboratory, Jodhpur 342011, India

Adv. Mater. Proc., 2018, 3 (2), 85-92

DOI: 10.5185/amp.2018/836

Publication Date (Web):05 February 2018

Copyright © IAAM-VBRI Press

Abstract


Abstract

In the ongoing search for newer materials for microwave absorption applications, the graphene merits a special consideration owing to its outstanding mechanical, thermal and electrical properties. Here, we report investigation on microwave absorption properties of Fe-Co oxide- thermally exfoliated graphene oxide (Fe-Co oxide-TEGO) composite in a frequency range of
8-18 GHz. Fe-Co oxide was synthesized by thermal decomposition of Fe-Co oxide/aniline- formaldehyde copolymer at
900 0C in air.  Fe-Co oxide-TEGO hybrid was prepared by physical mixing of Fe-Co oxide and TEGO. Thereafter, hybrid was characterized using scanning electron microscope, energy dispersive X-ray, Fourier transform infrared spectrometer and X-ray diffractrometer. Thereafter, Fe-Co oxide-TEGO composites were prepared by intermixing in different weight % in PU (polyurethane) resin and their electromagnetic and microwave absorption properties were studied. The effect of varying the weight % of Fe-Co oxide in Fe-Co oxide-TEGO composite on electromagnetic properties was also studied. The absorption bandwidth of 3.5 GHz (8.5-12.0 GHz, X-band) and 5.0 GHz (13.0-18.0 GHz, Ku -band) has been achieved using Fe-Co oxide-TEGO composite (50 wt%) with 2.2 and 1.6 mm thickness, respectively. Microwave absorption studies show Fe-Co oxide- TEGO composite as a potential candidate for microwave absorption applications. Copyright© 2018 VBRI Press.

Keywords


Graphite oxide, composite, dielectric loss, microwave absorption, lightweight absorber.