Development of FeCoB/Graphene Oxide based microwave absorbing materials for X-Band region

• FeCoB coated Graphene Oxide (GO) was synthesized by co-precipitation method.
• GO, FeCoB and GO@FeCoB based microwave absorbers were developed with Epoxy matrix.
• GO and FeCoB/Epoxy absorbers showed −7.86 & −13.30 dB reflection loss, respectively.
• Maximum Reflection loss of −22.24 dB was achieved with GO@FeCoB/Epoxy absorber.

This work explored the microwave absorption capability of Graphene Oxide and Graphene Oxide coated with FeCoB for stealth technology. Epoxy based microwave absorbing materials were prepared with 30% loading of Graphene Oxide, FeCoB alloy and Graphene Oxide coated with FeCoB. Graphene Oxide and FeCoB were synthesized by Hummer's and Co-precipitation methods, respectively. The filler particles were characterized by FESEM, XRD and Vibrating Sample Magnetometer techniques. Permittivity, permeability and reflection loss values of the composite absorbers were measured with vector network analyzer which showed a reflection loss value of −7.86 dB, at 10.72 GHz, for single layered Graphene Oxide/Epoxy based microwave absorbers which can be correlated to the absorption of about 83.97% of the incident microwave energy. Reflection loss value of FeCoB/Epoxy based microwave absorber showed −13.30 dB at 11.67 GHz, which corresponded to maximum absorption of 93.8%. However, reflection loss values of Graphene Oxide coated with FeCoB/Epoxy based single-layer absorber increased to −22.24 dB at 12.4 GHz which corresponds to an absorption of 99% of the incident microwave energy.

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