Fabrication and microwave shielding properties of free standing polyaniline-carbon fiber thin sheets

Joon, Seema; Kumar, Rakesh; Singh, Awantika; Shukla, Rajni; Dhawan, S. K.

doi:10.1016/j.matchemphys.2015.04.010

Cited by 22 publications

(14 citation statements)

References 45 publications

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“…Furthermore, their low density is also helpful to create a new kind of lightweight MAMs. For example, when carbon black and carbon fiber are coated with a rational amount of PANI, their effective absorption for the incident EM waves will be sufficiently strengthened [ 131 , 132 ]. With the development of carbon science, various fine carbon materials (e.g., carbon nanotubes (CNTs) and graphene) appeared as promising MAMs and became popular carbon additives in CPs [ 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 ].…”

Section: Cp-based Composites As Mamsmentioning

confidence: 99%

“…As mentioned above, well-matched characteristic impedance and good reflection loss property can be also achieved by rational manipulation of absolute dielectric loss systems [ 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 ], and thus the third strategy for multi-compound CP-based composites is derived from the combination of various dielectric components. For instance, Sambyal et al blended PANI, barium strontium titanate, and expanded graphite into ternary composites with different weight ratios, and they found that the weight ratio could impact the microwave absorption of these composites greatly [ 173 ].…”

Section: Cp-based Composites As Mamsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Wang

et al. 2017

Polymers

117

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Microwave absorbing materials (MAMs) are paving the way for exciting applications in electromagnetic (EM) pollution precaution and national defense security, as they offer an advanced alternative to conventional reflection principles to fundamentally eliminate the EM waves. Conjugated polymer (CP)-based composites appear as a promising kind of MAM with the desirable features of low density and high performance. In this review, we introduce the theory of microwave absorption and summarize recent advances in the fabrication of CP-based MAMs, including rational design of the microstructure of pure conjugated polymers and tunable chemical integration with magnetic ferrites, magnetic metals, transition metal oxides, and carbon materials. The key point of enhancing microwave absorption in CP-based MAMs is to regulate their EM properties, improve matching of characteristic impedance, and create diversified loss mechanisms. The examples presented in this review will provide new insights into the design and preparation of CP-based composites that can satisfy the high demands of the oncoming generation of MAMs.

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Section: Cp-based Composites As Mamsmentioning

confidence: 99%

Section: Cp-based Composites As Mamsmentioning

confidence: 99%

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Wang

et al. 2017

Polymers

117

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“…This unique structure can act as the interconnecting bridge between the conducting PANI grains. The coupling or coherence between the PANI chains can be increased, leading to the enhancement of interchain charge transport and resulting in high conductivity . On the other hand, CF/PANI shows slightly lower electrical property (5.57 ± 0.04 S cm −1 ) than NaCF/PANI.…”

Section: Resultsmentioning

confidence: 99%

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Zhang

Yang

Wen

2019

Adv Materials Inter

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necessary features has captured enormous scientific attentions.In particular, intrinsically conductive polymers (ICPs) have gained a special status among the promising EMI shielding materials. Among the large family of ICPs, polyaniline (PANI) is one of the prominent polymers, primarily owing to its fascinating properties, such as high electrical conductivity, ease of fabrication, unique controlled chemical and physical properties, as well as low cost. [3] Recently, PANI-based composite has aroused great interest due to the magnified or enhanced electromagnetic properties compared to their bulk counterpart. [4] Various components, such as carbon material, barium titanate (BaTiO 3 ), and bagasse fiber have been adopted to prepare the composites. For example, multi-walled carbon nanotube (MWCNT)/PANI nanocomposites possess a total EMI shielding effectiveness (SE) of ≈39.2 dB at the thickness of 2.0 mm, which is attributed to the synergistic effect of two complementary MWCNT and PANI phases. [5] Due to the optimized dielectric and electrical properties, an excellent SE of 71.5 dB was achieved for BaTiO 3 /PANI nanocomposites with the thickness of 2.7 mm. [6] Compared to pristine PANI, the core-shelled bagasse fiber@PANI composite exhibits immense potential for EMI shield with higher attenuation performance due to the synergistic and interfacial effects. [4b] It is noteworthy that in above cases the structure of PANI is a key parameter that determines its properties and application. Therefore, the delicate regulation and control of highly ordered PANI structures are highly desirable.On the other hand, inspired by natural materials, the designed helical structures endow materials the unique electrical and magnetic performance. Motojima et al. reported the microwave can be significantly attenuated by the helical structure, because of the effective generation of an inductive current. [7] Most recently, Yang et al. reported that PANI with a helical superstructure was produced by co-self-assembly process combined with emulsion droplets methods. The enhanced microwave absorption ability was achieved due to the supramolecular chirality. [8] So, the helical structure is expected to produce excellent EMI shielding performances. But as of yet, sparse research has concentrated on the effect of spiral structure on the shielding properties of PANI-based composites and their underlying mechanism. Furthermore, the EMI shielding capability of the PANI-based helical composite lacks sufficient theoretical Herein, a unique, 3D helical composite with excellent electromagnetic interference (EMI) shielding capability is fabricated. The alkali treated natural cotton fiber (NaCF) is adopted as the helical templet. The compacted polyaniline (PANI) clusters are grafted over NaCF surface via in situ polymerization technology. The correlation between structure and electromagnetic characteristics is investigated in details. The high doping degree and high crystalline phase of PANI coating layer results in the enhanced electrical conductivit...

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“…When the conducting polymers are taken in the form of composites with conductive llers, their electrical, as well as their mechanical properties, are enhanced. 16,17 A number of articles have reported the EMI shielding properties of conducting polymer composites. 18,19 The conductivity of these heterogeneous systems depends on many factors such as the concentration of conducting llers, their shape, size, orientation and interfacial interaction between llers and the host matrix.…”

Section: Sensorsmentioning

confidence: 99%

“…The detailed synthesis process is same as that of our previous report given for the synthesis of polyaniline-carbon ber composites. 17 In addition, poly(o-toluidine) (PoT) without CF was also synthesized by the same route for comparative study.…”

Section: Synthesis Of Potcf Composite and Fabrication Of Thin Sheetsmentioning

confidence: 99%

Lightweight and solution processible thin sheets of poly(o-toluidine)-carbon fiber-novolac composite for EMI shielding

et al. 2015

Self Cite

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An attempt has been made to generate lightweight and processible thin sheets of poly (o-toluidine)-carbon fiber (PoTCF) composite for electromagnetic interference shielding. PoTCF composite synthesized by oxidative emulsion polymerization was physically blended with different weight ratios of novolac resin to prepare a new class of composite material, which was further processed to form thin sheets (thickness of $0.85 mm) by a compression moulding technique. In situ incorporation of carbon fiber into the polymer matrix leads to the formation of composites with improved mechanical, thermal, electrical and shielding properties, which were further optimized by varying the amount of novolac resin in the sheets.Structural and morphological studies were carried out by UV-vis, FTIR, XRD and SEM. PoTCF composite sheets with 50 wt% loading of novolac resin have flexural strength of 36.0 MPa and exhibit a shielding effectiveness of 24 dB in the X-band (8.2-12.4 GHz) at a critical thickness of $2.11 mm, which is more than the limit required for techno-commercial applications. Therefore, indigenously fabricated polymerbased sheets would be potentially useful for making durable enclosures for electronic equipment.

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Fabrication and microwave shielding properties of free standing polyaniline-carbon fiber thin sheets

Cited by 22 publications

References 45 publications

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

Recent Advances in Conjugated Polymer-Based Microwave Absorbing Materials

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Lightweight and solution processible thin sheets of poly(o-toluidine)-carbon fiber-novolac composite for EMI shielding

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