# Graphene and Iron Reinforced Polymer Composite Electromagnetic Shielding Applications: A Review
## 5 Polymer-Based Composites
### Graphene@Iron@Polymer Composites
#### 5.1.2 Interpretation of Graphene@Iron@Polymer Based Composites Articles
[166] used NiFe\({}_{2}\)O\({}_{4}\), RGO and polypropylene to form a shielding composite. The testing was in the range of 6-8 GHz where high shielding effectiveness of 29.4 dB was achieved with 2 mm thickness and 5 wt.% RGO loading. Table 2 shows a summary of polymer-based composites. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**S. No** & **Material** & **Thickness** & **Loading** & **Methods** & **Frequency** &
\begin{tabular}{} **Shielding** \\ **Effectiveness** \\ \end{tabular} & **Year** & **Reference** \\ \hline
1 & PVC/PANI/CNP & - & 5 wt.\% & Solution processing method & 18-20 GHz & 51 dB & 2019 & [107] \\ \hline
2 & GNNPPANI & 1.5 mm & - & In-situ growth & 12 GHz & \(-\)145 dB & 2019 & [108] \\ \hline
3 & TiO\({}_{2}\)/PANI/GO & 3.12 mm & - & In-situ growth & 2-18 GHz & \(-\)51.7 dB & 2017 & [109] \\ \hline
4 & Graphene@PANI@TiO\({}_{2}\) & 1.5 mm & - &
\begin{tabular}{} 1. In-situ growth \\ 2. Hydrothermal method \\ \end{tabular} & 2-18 GHz & \(-\)45.4 dB & 2016 & [110] \\ \hline
5 & Graphene@Fe\({}_{3}\)O\({}_{4}\)@PANI@WO\({}_{3}\) & 4 mm & - &
\begin{tabular}{} 1. Hydrothermal method \\ 2. Chemical oxidation polymerization \\ \end{tabular} & 9.4 GHz & \(-\)46.7 dB & 2017 & [111] \\ \hline
6 & Graphene@Fe\({}_{3}\)O\({}_{4}\)@SO\({}_{2}\)@polyaniline & 2.5 mm & - & Dilute polymerization & 12.5 GHz & \(-\)40.7 dB & 2015 & [112] \\ \hline
7 & PANI/GO/Fe\({}_{3}\)O\({}_{4}\) & 3.91 mm & - & Hummes method & 2-18 GHz & \(-\)53.5 dB & 2015 & [113] \\ \hline
8 & Ag@Graphene/PANI & - & 5 wt.\% & In-situ growth & 0.4-1.6 GHz & 29.33 dB & 2013 & [114] \\ \hline
9 & Fe\({}_{3}\)O\({}_{4}\)/PANI rod/RGO & 3.5 mm & - & Facile method & 2-18 GHz & \(-\)33.3 dB & 2019 & [115] \\ \hline
10 & Graphene@NO@PANI@AgAg & 3.5 mm & - & 1. Hydrothermal method & 2-18 GHz & \(-\)37.5 dB & 2017 & [116] \\ \hline
11 & G-PANI & 1.5 mm & - & In-situ growth & 2-18 GHz & 32.5 dB & 2017 & [117] \\ \hline
12 & 7-Fe\({}_{2}\)O\({}_{3}\)/RGO/PANI & 2.5 mm & - &
\begin{tabular}{} 1. Chemical oxidation polymerization \\ 2. In-situ growth \\ \end{tabular} & 8-12 GHz & 51 dB & 2014 & [118] \\ \hline
13 & Ti\({}_{3}\)C\({}_{2}\)T\({}_{x}\)/Fe\({}_{3}\)O\({}_{4}\)@PANI & 12.1 mm & - & Co-precipitation & 8-12 GHz & 58.8 dB & 2020 & [119] \\ \hline
14 & PANI/BF/RGO & - & - & Citrate precursor method & 8-12 GHz & 31.1 dB & 2016 & [120] \\ \hline
15 & PANI/L\({}_{3}\)Fe\({}_{3}\)C\({}_{3}\)C\({}_{4}\) & 2 mm & - & In-situ growth & 8-12 GHz & 42 dB & 2019 & [121] \\ \hline
16 & RGO@polystyrene & - & 3.47 vol\% & High-pressure solid-phase & 8-12 GHz & 451 dB & 2015 & [99] \\ \hline
17 & \
\begin{tabular}{} \end{tabular} & 2 mm & 10 wt.\% & Hot compressed method & 0-20 GHz &
\begin{tabular}{} 29.7 dB \\ 14.2 dB \\ \end{tabular} & 2018 & [122] \\ \hline
18 & Polycarbonate/CNP & 1 mm & - & Facile solution method & 8-12 GHz &
\begin{tabular}{} 35 dB \\ 47 dB \\ \end{tabular} & 2018 & [123] \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Summary of Polymer-based composites. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline