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Research Article Open Access

Synthesis and characterization of nickel coated exfoliated graphite for microwave absorber applications

Sandeep Kumar Singh1*, Amit Kumar Yadav1, M. J. Akhtar1,2, K. K. Kar1,3

1Materials Science Programme, Indian Institute of Technology, Uttar Pradesh, Kanpur, 208016, India

2Department of Electrical Engineering, Indian Institute of Technology, Uttar Pradesh, Kanpur, 208016, India

3Department of Mechanical Engineering, Indian Institute of Technology, Uttar Pradesh, Kanpur, 208016, India

Adv. Mater. Proc., 2017, 2 (1), 02-05

DOI: 10.5185/amp.2017/102

Publication Date (Web):01 January 2017

Copyright © IAAM-VBRI Press

Abstract


Abstract

Microwave absorbing material of nickel coated exfoliated graphite (Ni-EG) was prepared by electroless deposition in alkaline coating bath.  The coating time, which is an important factor to achieve good coverage of Ni particles over exfoliated graphite (EG), was properly controlled during the process. Morphology and phases of Ni-EG were investigated by means of SEM and XRD, respectively. Electromagnetic (EM) properties of Ni-EG/epoxy composites were recorded using VNA over the frequency range of 2-18 GHz. Ni-EG/epoxy composites exhibit significant microwave absorption properties for coating time 10, 20, 30 and 40 minutes. Specially, reflection loss value reached -23.7 dB at 10.9 GHz with 6.0 GHz (8.1-14.1 GHz) and 2.0 GHz (10.1-12.1 GHz) of -10 and -20 dB absorption bandwidths, respectively for 40 minutes of deposition time. Therefore, the proposed material has a great potential for stealth applications. Copyright © 2016 VBRI Press.

Keywords


Electroless, nickel coated exfoliated graphite, composite, microwave absorption, coating time