Barium ferrite and graphite integrated with polyaniline as effective shield against electromagnetic interference

Gairola, Preeti; Gairola, S.P.; Kumar, Vijay; Singh, Kuldeep; Dhawan, S. K.

doi:10.1016/j.synthmet.2016.09.023

Cited by 105 publications

(27 citation statements)

References 19 publications

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“…Nowadays the problem of electromagnetic interference (EMI) has increased very rapidly due to excessive use of electronic equipment's like electronic and telecommunication devices in different applications e.g. satellite broadcast systems (11.5-12.1 GHz), radar (12.3-18.1 GHz), LAN systems (2.43, 4.9, 19, 21, 60 GHz) and mobile phones (0.7-1.6 GHz) [1][2][3]. These cause serious health issues on the person working in the surrounding of equipment emitting EM wave.…”

Section: Introductionmentioning

confidence: 99%

“…PANI in combination with PVC, PS and other thermoplastic polymers was used and observed very good EMI shielding properties [6,7,11] Conventionally, materials having good magnetic properties i.e. permeability, high saturation magnetization like Co, Mn, Zn, and Ba ferrites were used as microwave absorbing materials [1,[12][13][14][15]. The magnetic ferrites are mostly used due to their low eddy current losses and high electrical resistivity.…”

Section: Introductionmentioning

confidence: 99%

“…This network structure has greater reflection loss as compared to NiFe nanoparticles with the lightweight property as EMI shielding materials [18]. Barium ferrite and graphite were incorporated into PANI to make a conductive composite for EMI shielding purpose which shows shielding effectiveness (− 37.1 dB) in X-band (8.2-12.4 GHz) range depends on dielectric loss [1].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nickel-spinal-Ferrites on EMI shielding properties of polystyrene/polyaniline blend

et al. 2020

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Magnetic and electrically conductive polymeric nanocomposites were fabricated using polystyrene (PS) as matrix, Nickel Ferrites (NiFe) as magnetic nanofiller and polyaniline (PANI) as electrically conductive nanofiller. Electromagnetic interference (EMI) shielding and infrared (IR) blocking are the main application of these nanocomposites. PANI and NiFe were successfully prepared by chemical and co-precipitation methods respectively. The successful fabrication of nanofillers was confirmed by the X-ray diffraction technique. DC conductivity and dielectric properties were first analyzed and a huge increase in both dielectric constant and DC conductivity was observed. Dielectric Constant seemed to be increased from 2.2 for PS to 5.5 for PS/PANI/NiFe composite. For the measurement of EMI shielding effectiveness (SE), Vector Network Analyzer was used in 0.1-20 GHz frequency range. IR spectroscopy was used to measure IR transmission in near-infrared (NIR) region of 700-2500 nm wavelength range. PS film is transparent for both NIR waves and microwaves, by observing almost 90% transmission in the NIR range and about − 3 dB SE in the microwave region. IR transmission reduces to less than 0.5% for PS/PANI/NiFe composite in the whole NIR range. Also, in the microwave region, − 3 dB shielding enhanced to less than − 35 dB in a broad range of frequency from 0.1 to 20 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Nickel-spinal-Ferrites on EMI shielding properties of polystyrene/polyaniline blend

et al. 2020

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“…With the rapid development of wireless telecommunication technology and wide use of microwave (MW) signals in many different fields, electromagnetic pollution has become a serious issue which has aroused much attention all over the world . Microwave absorbing materials is an important function material which can minimize electromagnetic reflection, plays a great role in electromagnetic pollution controlling, electromagnetic interference (EMI) shielding and stealth technology, etc . Among the candidates for such application, ferrites present an interesting material.…”

Section: Introductionmentioning

confidence: 99%

Microwave‐absorbing properties of strontium ferrites prepared via sol‐gel method

Xing

Pan

Zhong

et al. 2017

Crystal Research and Technology

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Strontium ferrites were prepared by sol-gel method, the phase structure, morphology, and microwave absorbing properties of the samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and vector network analyzer (VNA). The results show that with increasing sintering temperature, the wave-absorption peak frequency moves towards low-frequency direction and the reflection loss value decreases first, and then increases. At the same sintering temperature (1200°C) and different holding time (2h, 4h, 6h, 8h), the ferrites have the same Z-type phase structure. With increasing holding time, the absorption peak frequency of the ferrites shift towards low-frequency region, and the minimum reflectivity value decreases first and increases afterwards, and the ferrite holding at 1200°C for 4 h has the best microwave-absorbing property.

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“…Microwave protecting tools should possess particular qualities; as appropriate shielding effectiveness (SE), proper mechanical features, lightness, suitable processability, and cost-effective. This can be regarded as a ground breaking effort that shows the electromagnetic protecting efficiency of nanoferrite (magnetic material), extended graphite (Carbon material), and Polyaniline (conductive polymer) compound for industrial use (Electromagnetic Interference Shielding) that is adjustable with findings that are revealed experimentally [1].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of templated barium hexaferrite (BaFe12O19) nanoparticles and investigation of its microwave absorption properties by silicone rubber matrix at x-band frequency

Ahmadi¹,

Peymanfar²,

Abdolrahimi³

et al. 2017

Proceedings of the 21st International Electronic Conference on Synthetic Organic Chemistry

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Recently, barium ferrite nanoparticles have attracted substantial attention because of widespread applications in catalytic degradations, credit cards, storage hardware, sensors, microwave devices, permanent magnets, high frequency devices, photocatalyst, and etc. In this research, templated BaFe 12 O 19 nanoparticles were prepared through the sol-gel method by use of cotton as a template in the sol step. Finally, templated nanoparticles were blended in the silicone rubber matrix and then prepared nanocomposite molded to investigate of microwave absorption properties at x-band frequency. Templated barium hexaferrite nanoparticles were characterized by Fourier transform infrared (FT-IR), diffuse reflection spectroscopy (DRS), vibrating sample magnetometer (VSM), field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and microwave absorption characteristics were obtained by vector network analyzer (VNA). Microwave absorption curves showed that templated BaFe 12 O 19 /silicone rubber nanocomposite absorbed 65.80% of microwaves at 9.87 GHz.

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Barium ferrite and graphite integrated with polyaniline as effective shield against electromagnetic interference

Cited by 105 publications

References 19 publications

Effect of Nickel-spinal-Ferrites on EMI shielding properties of polystyrene/polyaniline blend

Effect of Nickel-spinal-Ferrites on EMI shielding properties of polystyrene/polyaniline blend

Microwave‐absorbing properties of strontium ferrites prepared via sol‐gel method

<strong>Preparation and characterization of templated barium hexaferrite (BaFe<sub>12</sub>O<sub>19</sub>) nanoparticles and investigation of its microwave absorption properties by silicone rubber matrix at x-band frequency</strong>

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