polymers Review Graphene and Iron Reinforced Polymer Composite Electromagnetic Shielding Applications: A Review Saba Ayub 1, * , Beh Hoe Guan 1 , Faiz Ahmad 2 , Yusuff Afeez Oluwatobi 1 , Zaib Un Nisa 1 , Muhammad Faisal Javed 3 and Amir Mosavi 4,5,6,7, *   Citation: Ayub, S.; Guan, B.H.; Ahmad, F.; Oluwatobi, Y.A.; Nisa, Z.U.; Javed, M.F.; Mosavi, A. Graphene and Iron Reinforced Polymer Composite Electromagnetic Shielding Applications: A Review. Polymers 2021, 13, 2580. https:// doi.org/10.3390/polym13152580 Academic Editor: Cristina Vallés Received: 31 May 2021 Accepted: 23 June 2021 Published: 3 August 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). 1 Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia; beh.hoeguan@utp.edu.my (B.H.G.); oluwatobi_20001848@utp.edu.my (Y.A.O.); zaib_20001001@utp.edu.my (Z.U.N.) 2 Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia; faizahmad@utp.edu.my 3 Department of Civil Engineering, COMSATS University Islamabad Abbottabad Campus, Abbottabad 22060, Pakistan; arbabfaisal@cuiatd.edu.pk 4 Faculty of Civil Engineering, Technische Universität Dresden, 01069 Dresden, Germany 5 John von Neumann Faculty of Informatics, Obuda University, 1034 Budapest, Hungary 6 Information Systems, University of Siegen, 57072 Siegen, Germany 7 Department of Informatics, J. Selye University, 94501 Komarno, Slovakia * Correspondence: saba_20000009@utp.edu.my (S.A.); amir.mosavi@kvk.uni-obuda.hu (A.M.) Abstract: With advancements in the automated industry, electromagnetic inferences (EMI) have been increasing over time, causing major distress among the end-users and affecting electronic appliances. The issue is not new and major work has been done, but unfortunately, the issue has not been fully eliminated. Therefore, this review intends to evaluate the previous carried-out studies on electromagnetic shielding materials with the combination of Graphene@Iron, Graphene@Polymer, Iron@Polymer and Graphene@Iron@Polymer composites in X-band frequency range and above to deal with EMI. VOSviewer was also used to perform the keyword analysis which shows how the studies are interconnected. Based on the carried-out review it was observed that the most preferable materials to deal with EMI are polymer-based composites which showed remarkable results. It is because the polymers are flexible and provide better bonding with other materials. Polydimethyl- siloxane (PDMS), polyaniline (PANI), polymethyl methacrylate (PMMA) and polyvinylidene fluoride (PVDF) are effective in the X-band frequency range, and PDMS, epoxy, PVDF and PANI provide good shielding effectiveness above the X-band frequency range. However, still, many new combinations need to be examined as mostly the shielding effectiveness was achieved within the X-band frequency range where much work is required in the higher frequency range. Keywords: electromagnetic inference; shielding effectiveness; graphene; iron; polymer; composite materials; materials; review; materials design; computational materials design 1. Introduction Electromagnetic interference (EMI) has emerged as a global issue due to the rapid growth of electronic devices and their usage in day-to-day life [1]. Electromagnetic pol- lution is triggering loss of data, signal disturbing, system failures and most importantly causing a serious threat to information communication security and human health [2–4]. Owing to the increased usage of these electromagnetic devices, radiation of the electromag- netic (EM) wave has become a serious concern because these radiations not only become disastrous for electronic equipment but also affecting human health [5]. With the advance- ment in technologies, human exposure to electromagnetic fields is getting common and unavoidable [6–8]. Electromagnetic waves do not deflect by any magnetic or electric field and cause serious issues [9]. Electromagnetic waves are causing damages in various forms such as changes in physiological indices, genetic effects, health, and immune functions. Polymers 2021, 13, 2580. https://doi.org/10.3390/polym13152580 https://www.mdpi.com/journal/polymers