Electromagnetic Properties Performance of MWCNTs/Polyester Composites in X-band

K Y You,P.J Soh,S.A Aljunid,E M Cheng,M.A.A Mohd Salleh,K.N.F Ku Azir,Nurulbariah Idris,L Zahid,C Y Lee,Y S Lee,Nur Hidayah Ramli,M S Shakhirul,F H Wee,Y Y Lee,C.B.M Rashidi

doi:10.1051/matecconf/201815006014

Abstract

In this paper presents nano-composites based on polyester (PE) matrix with multi-walled carbon nanotubes (MWCNTs) as fillers have been developed for microwave absorbing materials. The MWCNTs/PE composite samples were fabricated with different weight ratio of MWCNTs (3 wt%, 5 wt%, and 10 wt%). The electromagnetic properties of different MWCNTs/PE composite have been determined by using rectangular waveguide technique and Agilent material measurement software. Moreover, the reflection loss (microwave absorption) of MWCNTs/PE composite have been calculated based on the basis of transmission line theory. The performance of electromagnetic properties and microwave absorption of MWCNTs/PE composite were analyzed in X-band frequency. The dielectric loss properties of the composite are increse with increasing in MWCNTs weight ratio. The microwave absorption results show that such 3 wt% MWCNTs/PE composites sample with 4 mm thickness has achieved less than -10 dB values (< 90 % microwave absorption) of reflection loss.

Highlights

The rapid growth in science and wireless technology towards gigahertz frequency applications in modern communication has increased the electromagnetic interference (EMI) [1], [2]
The sample with 3 wt% multi-walled carbon nanotubes (MWCNTs) shows average lower values of reflection loss in the frequency of X-band compare to the samples with 5 wt% and 10 wt% MWCNTs
At the frequency of 10 GHz the reflection loss value is close to -15.8 dB which corresponds to 97% of microwave absorption

Summary

Introduction

The rapid growth in science and wireless technology towards gigahertz frequency applications in modern communication has increased the electromagnetic interference (EMI) [1], [2]. The efficiency of EMI shielding or microwave absorbing materials (MAMs) were increasing to control the EMI pollution [3], [4]. MAMs can use to protect electronic device and human body from harmful effect of these microwaves energy. Carbon nanotubes (CNTs) is a high carbon dielectric material which exhibit excellent electronic, mechanical, and material sciences [5], [6]. Composites based on CNTs with polymer matrix are widely used in many application due to the unique and advantageous properties offered by the new composites materials. Dielectric loss factor is the imginary part of the dielectric properties show the ability of material convert the stored energy to heat and dissipate. The interaction of microwave energy with MAMs is microwave energy stored (absorption) in materials and convert the energy to heat. The reflection loss (microwave absorption) of the samples were calculated and analyzed

Reflection Loss

Material Properties Measurement

Results and Discussion

Conclusions