Effect of graphene oxide and metallic fibers on the electromagnetic shielding effect of engineered cementitious composites

Mazzoli, Alida; Corinaldesi, Valeria; Donnini, Jacopo; Perna, Costanzo Di; Micheli, Davide; Vricella, A.; Pastore, Roberto; Bastianelli, Luca; Moglie, Franco; Primiani, Valter Mariani

doi:10.1016/j.jobe.2018.02.019

Cited by 66 publications

(30 citation statements)

References 29 publications

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“…[1][2][3][4][5][6][7][8][9][10][11] In addition, EM radiation is a major concern for human health without other metallic-or nonmetallic-particles [40,42,51,53,[55][56][57][58][59][60] as fillers in various composites for EMI shielding purposes. As the electronic devices decrease in size, and operate at ever increasing frequencies, they produce more heat and EM waves, which result in faster degradation of such devices and negative effects on adjacent electronic systems.…”

Section: Introductionmentioning

confidence: 99%

“…The heat and EM radiation have an inherent connection-absorption of EM waves by any material results in its heating. Several studies reported the use of carbon fibers, [22][23][24][25][26][27][28][29] carbon black, [30,31] bulk graphite, [32][33][34] carbon nanotubes (CNT), [16,17,[35][36][37][38][39] reduced graphene oxide (rGO), [2,6,[40][41][42][43][44][45][46][47][48][49][50] graphene, [51][52][53][54] and combination of carbon allotropes with orThe synthesis and characterization of epoxy-based composites with few-layer graphene fillers, which are capable of dual-functional applications, are reported. The conventional approach for handling the heat and EM radiation problems is based on utilization of the thermal interface materials (TIM), which can spread the heat, and electromagnetic interference (EMI) shielding materials, which can protect from EM waves.…”

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confidence: 99%

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Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Kargar

Barani

Balinskiy

et al. 2018

Adv Elect Materials

195

132

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and environment. [12][13][14] The current industrial and safety standards require blocking of more than 99% of the EM radiation from any electronic devices. [1,[15][16][17] From the other side, the operation of the electronic devices can be disrupted by the outside EM waves. The heat and EM radiation have an inherent connection-absorption of EM waves by any material results in its heating. The energy from EM wave transfers to electrons and then to phonons-quanta of crystal lattice vibrations. The conventional approach for handling the heat and EM radiation problems is based on utilization of the thermal interface materials (TIM), which can spread the heat, and electromagnetic interference (EMI) shielding materials, which can protect from EM waves. These two types of materials have different, and, often, opposite characteristics, e.g., excellent EMI material can be a poor heat conductor, while efficient TIM can utilize electrically nonconductive fillers, resulting in its transparency for EM waves. Here, we propose a concept of the "dual-functional" EMI shielding-TIM materials, and demonstrate it on the example of graphene composites.It is well known that EMI shielding requires interaction of the EM waves with the charge carriers inside the material so that EM radiation is reflected or absorbed. For this reason, the EMI shielding material must be electrically conductive or contain electrically conductive fillers, although a high electrical conductivity is not required. The bulk electrical resistivity on the order of 1 Ω cm is sufficient for most of EMI shielding applications. [1,3,15] Most of the polymer-based materials widely used as TIMs in electronic packaging are electrically insulating and, therefore, transmit EM waves. Conventionally, metal particles are added as fillers in high volume fractions to the base polymer matrix in order to increase the electrical conductivity and prevent EM wave propagation from the device to the environment and vice versa. [1,[18][19][20][21] However, the polymer-metal composites suffer from high weight, cost, and corrosion, which make them an undesirable choice for the state-of-the-art downscaled electronics. Several studies reported the use of carbon fibers, [22][23][24][25][26][27][28][29] carbon black, [30,31] bulk graphite, [32][33][34] carbon nanotubes (CNT), [16,17,[35][36][37][38][39] reduced graphene oxide (rGO), [2,6,[40][41][42][43][44][45][46][47][48][49][50] graphene, [51][52][53][54] and combination of carbon allotropes with orThe synthesis and characterization of epoxy-based composites with few-layer graphene fillers, which are capable of dual-functional applications, are reported. It is found that composites with certain types of few-layer graphene fillers reveal an efficient total electromagnetic interference shielding, SE tot ≈ 45 dB, in the important X-band frequency range, f = 8.2 −12.4 GHz, while simultaneously providing high thermal conductivity, K ≈ 8 W m −1 K −1 , which is a factor of ×35 larger than that of the base matrix material. The efficiency of the d...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Kargar

Barani

Balinskiy

et al. 2018

Adv Elect Materials

195

132

View full text Add to dashboard Cite

show abstract

“…Although the polymer-metal composites alleviate the problems associated with corrosion and oxidation, they suffer from heavy weight and degraded efficiency at elevated temperatures. [31,32] Ceramics, [33][34][35][36][37][38][39][40] carbon fibers, [41][42][43][44][45][46][47][48] carbon black, [49,50] carbon nanotubes, [51][52][53][54][55][56][57] graphite, [58][59][60] reduced graphene oxide, [5,8,[61][62][63][64][65][66][67][68][69][70][71] graphene, [72][73][74][75][76] ferromagnetic materials, [77][78]…”

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confidence: 99%

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Barani

Kargar

Mohammadzadeh

et al. 2020

Adv Elect Materials

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EM radiation. For this reason, the electronic components have to be protected from the intra-and inter-system EM radiations in order to avoid fast degradation and failure. [4-14] It has also been suggested that prolonged exposure to even nonionizing EM waves in the MHz and GHz frequency range may have detrimental effects on humans and other living beings making the EMI shielding important from safety perspectives. [15-19] The dense packing of the electronic components in the state-of-the-art 2D, 2.5D, and 3D integrated systems and generation of high heat fluxes create an environment with high temperatures, which adversely affect the efficiency and stability of the EMI shielding materials. [20,21] The absorption of EM waves results in the temperature rise of the material making the situation even worse. The data on the efficiency of the conventional and recent EM shield materials in most cases are limited to room temperature (RT) operation. [20-23] The latter is despite the fact that many new non-metallic materials, introduced for EMI shielding, suffer from thermal instability, oxidation, or significant reduction in the shielding efficiency at high temperatures. These concerns require development of novel multifunctional materials, which can serve concurrently as an excellent EM shields with the high thermal stability and conductivity at elevated temperatures. The ability of such materials to act as the thermal interface materials (TIMs) which can dissipate heat efficiently becomes a necessity rather than an extra bonus feature. [2,3,20,21,24] TIMs are applied between two solid surfaces in order to fill the microscopic voids at the interface, and enhance the thermal transport from a heat source to a heat sink. [25-27] The base materials for TIMs are amorphous polymers, which have low thermal conductivity, typically in the range from 0.2 to 0.5 Wm −1 K −1. [28] For this reason, the polymers used as base materials for TIMs are filled with highly thermally conductive fillers to enhance their overall thermal conductivity. The lowweight, mechanical stability, resistance to oxidation, flexibility, and ease of manufacturing are other important criteria for TIMs. EMI shielding materials block the incident EM waves by reflection and absorption mechanisms. Both mechanisms

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“…Microwave absorbers attract much attention due to broad prospects of the practical applications (weakening of the transmitted electromagnetic radiation). [5][6][7][8] Hard and so nanocomposites are technologically important materials because of their specic applications in magnetic recording media, magnetic uids, microwave devices, permanent magnets, and biomedicines. 9,10 These magnetic composites achieve high coercivity from the Mtype hexaferrite materials (hard ferrite) and high saturation magnetization from the spinel ferrites (so ferrite), and exhibit outstanding magnetic performance called exchange-spring magnets.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of the microwave properties of hard–soft functional composites SrTb_0.01Tm_0.01Fe_11.98O₁₉–AFe₂O₄ (A = Co, Ni, Zn, Cu, or Mn)

et al. 2020

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Effect of graphene oxide and metallic fibers on the electromagnetic shielding effect of engineered cementitious composites

Cited by 66 publications

References 29 publications

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Peculiarities of the microwave properties of hard–soft functional composites SrTb_0.01Tm_0.01Fe_11.98O₁₉–AFe₂O₄ (A = Co, Ni, Zn, Cu, or Mn)

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Effect of graphene oxide and metallic fibers on the electromagnetic shielding effect of engineered cementitious composites

Cited by 66 publications

References 29 publications

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Dual‐Functional Graphene Composites for Electromagnetic Shielding and Thermal Management

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

Peculiarities of the microwave properties of hard–soft functional composites SrTb0.01Tm0.01Fe11.98O19–AFe2O4 (A = Co, Ni, Zn, Cu, or Mn)

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Peculiarities of the microwave properties of hard–soft functional composites SrTb_0.01Tm_0.01Fe_11.98O₁₉–AFe₂O₄ (A = Co, Ni, Zn, Cu, or Mn)