The document discusses materials for electromagnetic interference (EMI) shielding. It describes various materials that can be used for EMI shielding including metals, carbons, ceramics, cement, polymers, and composites. Hybrids and composites of functional materials like metals and carbons with other components are most commonly used to tailor the structure and enhance shielding effectiveness. Ceramics, cement and polymers alone are typically not very effective for EMI shielding unless combined with conductive materials. Examples of different shielding materials and their properties are provided.

1. Materials For EMI and Ionization
Radiation Shielding
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Sciences Islamabad

2. CONTENT
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Electromagnetic
Interference
Consequences
of EMI
EMI Shielding
EMI Shielding
Materials
Summary References

3. ELECTROMAGNETIC INTERFERENCE
EMI is the unwanted noise or interference in an
electrical device or circuit caused by an
electromagnetic field from another source.
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4. ELECTROMAGNETIC INTERFERENCE
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5. CONSEQUENCES OF EMI
Adverse health
effects on living
organisms
Interruptions in
working of
electrical devices
Loss of sensitive
data
Malfunctioning of
flight controlling
system
False initiation of
electro explosive
detonator
Failure of pace
maker implanted
in a patient due to
a walkie talkie
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6. CASE STUDY
A Radio-signal controlled overhead
transporter dropped a few tons of liquid
metal on a worker leading to his death.
Cause was an accidental signal from a radio
transmitter that was mistakenly interpreted
by the transporter to get ride of the load.
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7. CASE STUDY
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Between 1981 and 1987, five US army
helicopters crashed when flew very close to
radio broadcast transmitters. Cause was
the insufficient immunity of flight control
electronic system against high intensity
radio waves that produced uncommanded
movements while flying past radio
broadcast towers.

8. EMI SHIELDING
EMI shielding refers to a material
that is used to isolate a device or
system from the source of an EM
wave transmission.
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9. EMI SHIELDING
EMI
SHIELDING
MECHANISM
REFLECTION
ABSORPTION
TOTAL
INTERNAL
REFLECTION
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10. EMI SHIELDING
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𝑺𝑬𝑻 = 𝑺𝑬𝑹 + 𝑺𝑬𝑨 + 𝑺𝑬𝑴

11. EMI SHIELDING
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ELECTRICAL
CONDUCTIVITY
MAGNETIC
PERMEABILITY
DIELECTRIC
PERMITIVITY
EMI Shielding Materials

12. EMI SHIELDING
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Faraday’s Cage

13. EMI SHIELDING
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Magnetic Shielding

14. EMI SHIELDING MATERIALS
Metals Carbons
Ceramics Cements
Conducting
Polymers
Composites
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15. EMI SHIELDING MATERIALS
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16. EMI SHIELDING MATERIALS
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Comparative study of EM-shielding performance among different
metal/composites

17. EMI SHIELDING MATERIALS
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Metals Price
(US$)/Kg
Density
(g/cc)
SE value
(dB)
Frequency
(MHz)
Advantages Limitations
Copper 6.3 8.92 77
57
45
30
900
1500
Good
Conductivity
, Ductile
Heavy,
Expensive
Aluminum 2.16 2.7 67
36
34
300
900
1500
Conductivity Easily
oxidizable
Magnesium 2.25 1.74 70
51
52
30
900
1500
Lightweight Poor
Corrosion
resistance
Comparison of different metals

18. EMI SHIELDING MATERIALS
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Ceramics
o Less common for EMI shielding
due to relative low conductivity.
o Mostly ceramic-carbon or
ceramic-metal composites are
used.
o MXenes, two-dimensional
inorganic compounds consisting
of layers of transition metal
carbides, nitrides or
carbonitrides, with each layer
being a few atoms thick.

19. EMI SHIELDING MATERIALS
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Carbons
o 2D graphene
o Carbon nanotube
o Expanded graphite
o Graphene oxide
o Reduced graphene oxide

20. EMI SHIELDING MATERIALS
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Polymers
Polyaniline
Polypyrrole
Polyfuran
Poly(para-
phenylene)
Polythiophene

21. EMI SHIELDING MATERIALS
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Non conducting polymers nanocomposites

22. EMI SHIELDING MATERIALS
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FCI/RGO Composites
Fig : (a) SEM image of FCI (b) RGO-coated FCI

23. EMI SHIELDING MATERIALS
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FCI/RGO Composites
Fig :(a) Reflection loss mapping of FCI and (b) RGO-coated FCI with absorbers thickness from
1 mm to 5 mm in the frequency range of 2.0–18.0 GHz

24. EMI SHIELDING MATERIALS
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Ni-coated Carbon-reinforced Polymer Composites
Fig :SEM images of Ni-coated CFs as a function of plating time

25. EMI SHIELDING MATERIALS
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Ni-coated Carbon-reinforced Polymer Composites
Fig :EMI-SE of Ni-coated CF composites as a function of plating time

26. EMI SHIELDING MATERIALS
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Electron-donor/acceptor doped Large-sized Graphene oxide sheets
Fabrication of
Iodine-doped LGO

27. EMI SHIELDING MATERIALS
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Electron-donor/acceptor doped Large-sized Graphene oxide sheets
Fig : Comparison of Shielding efficiency of I2-doped LGO and Pure LG

28. SUMMARY
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The shielding materials include metals, carbons, ceramics,
cement, polymers, hybrids and composites. The hybrids
and composites are the dominant avenues used to tailor
the structure for enhancing the shielding effectiveness.
Metals and carbons are the main functional materials for
providing shielding ability. Ceramics, cement and
polymers are typically not very effective, unless they are
combined with a functional component.

29. REFERENCES
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• D.D.L. Chung Materials for electromagnetic interference shielding Materials Chemistry and Physics 255
(2020) 123587
• Rachit Pandey, Sravya Tekumalla and Manoj Gupta EMI shielding of metals, alloys, and composites
Materials for Potential EMI Shielding Applications
• Byung-Joo Kim and Kwan-Woo Kim Carbon fiber-reinforced composites for EMI shielding, Materials for
Potential EMI Shielding Applications
• S.J. Vijaya , Alexandre Tugirumubanob , Sun Ho Gob , Lee Ku Kwacb and Hong Gun Kimb, Carbon fiber-
reinforced polymer-metal wire mesh hybrid composite for EMI shielding, Materials for Potential EMI
Shielding Applications
• Bartosz Zukowskia , Yasmim Gabriela dos Santos Mendonc¸aa , Jose Victor Brasil de Souza b and Romildo
Dias Toledo Filho, Cement-based EMI shielding materials, Materials for Potential EMI Shielding
Applications
• Vineeta Shukla, Review of electromagnetic interference shielding materials fabricated by iron ingredients,
Nanoscale Adv., 2019, 1, 1640–1671
• Yan-Jun Wan a, b , Peng-Li Zhu b , Shu-Hui Yu b , Rong Sun b, **, Ching-Ping Wong c , Wei-Hsin Liao a,
Graphene paper for exceptional EMI shielding performance using large-sized graphene oxide sheets and
doping strategy, Carbon 122 (2017) 74e81

30. THANK YOU
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