A unique strategy towards high dielectric constant and low loss with multiwall carbon nanotubes anchored onto graphene oxide sheets

Biswas, Sourav; Kar, Goutam Prasanna; Arora, Deepshikha; Bose, Suryasarathi

doi:10.1039/c4ra15885g

Cited by 16 publications

(10 citation statements)

References 34 publications

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“…Materials with extraordinary combination of properties are obtained by blending two polymers. [1][2][3] This class of materials are of great interest in the present era not only because they offer exciting mechanical, electrical, sensing or thermal behavior 4 but also for their sustainability and recycling capabilities. 5 Since the last few decades, work has been progressed to commercialize polymer blends with improved performance.…”

Section: Introductionmentioning

confidence: 99%

“…[40][41][42][43] However, hydrophobic CNTs tend to agglomerate in polymer blends due to poor interaction with the polymer limiting its use. 3,[44][45][46] Several strategies have been adopted to enhance the adhesion of CNTs and the polymer, such as introducing selective functional groups on the surface of CNTs. 35 Grafting of polymer chains onto CNTs 47 can also give excellent compatibility.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous enhancement in mechanical strength, electrical conductivity, and electromagnetic shielding properties in PVDF–ABS blends containing PMMA wrapped multiwall carbon nanotubes

Kar

Biswas

Bose

2015

Phys. Chem. Chem. Phys.

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A unique approach was adopted to drive the multiwall carbon nanotubes (MWNTs) to the interface of immiscible PVDF-ABS blends by wrapping the nanotubes with a mutually miscible homopolymer (PMMA). A tailor made interface with an improved stress transfer was achieved in the blends with PMMA wrapped MWNTs. This manifested in an impressive 108% increment in the tensile strength and 48% increment in the Young's modulus with 3 wt% PMMA wrapped MWNTs in striking contrast to the neat blends. As the PMMA wrapped MWNTs localized at the interface of PVDF-ABS blends, the electrical conductivity could be tuned with respect to only MWNTs, which were selectively localized in the PVDF phase, driven by thermodynamics. The electromagnetic shielding properties were assessed using a vector network analyser in a broad range of frequency, X-band (8-12 GHz) and Ku-band (12-18 GHz). Interestingly, enhanced EM shielding was achieved by this unique approach. The blends with only MWNTs shielded the EM waves mostly by reflection however, the blends with PMMA wrapped MWNTs (3 wt%) shielded mostly by absorption (62%). This study opens new avenues in designing materials, which show simultaneous improvement in mechanical, electrical conductivity and EM shielding properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous enhancement in mechanical strength, electrical conductivity, and electromagnetic shielding properties in PVDF–ABS blends containing PMMA wrapped multiwall carbon nanotubes

Kar

Biswas

Bose

2015

Phys. Chem. Chem. Phys.

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“…Melt rheology is a useful tool to understand the flow characteristics which is important from the processability of the composites. − But in immiscible polymer blends, the characteristics flow behavior is complex due to the interdependence of viscoelastic properties and obtained micro structures during blending. The state of dispersion of the nanoparticles can also be comprehended from the viscoelastic properties of the blend.…”

Section: Resultsmentioning

confidence: 99%

Tailor-Made Distribution of Nanoparticles in Blend Structure toward Outstanding Electromagnetic Interference Shielding

Biswas

Kar

Bose

2015

ACS Appl. Mater. Interfaces

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101

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Engineering blend structure with tailor-made distribution of nanoparticles is the prime requisite to obtain materials with extraordinary properties. Herein, a unique strategy of distributing nanoparticles in different phases of a blend structure has resulted in >99% blocking of incoming electromagnetic (EM) radiation. This is accomplished by designing a ternary polymer blend structure using polycarbonate (PC), poly(vinylidene fluoride) (PVDF), and poly(methyl methacrylate) (PMMA) to simultaneously improve the structural, electrical, and electromagnetic interference shielding (EMI). The blend structure was made conducting by preferentially localizing the multi-wall nanotubes (MWNTs) in the PVDF phase. By taking advantage of "π-π stacking" MWNTs was noncovalently modified with an imidazolium based ionic liquid (IL). Interestingly, the enhanced dispersion of IL-MWNTs in PVDF improved the electrical conductivity of the blends significantly. While one key requisite to attenuate EM radiation (i.e., electrical conductivity) was achieved using MWNTs, the magnetic properties of the blend structure was tuned by introducing barium ferrite (BaFe) nanoparticles, which can interact with the incoming EM radiation. By suitably modifying the surface of BaFe nanoparticles, we can tailor their localization under the macroscopic processing condition. The precise localization of BaFe nanoparticles in the PC phase, due to nucleophilic substitution reaction, and the MWNTs in the PVDF phase not only improved the conductivity but also facilitated in absorption of the incoming microwave radiation due to synergetic effect from MWNT and BaFe. The shielding effectiveness (SE) was measured in X and Ku band, and an enhanced SE of -37 dB was noted at 18 GHz frequency. PMMA, which acted as an interfacial modifier in PC/PVDF blends further, resulting in a significant enhancement in the mechanical properties besides retaining high SE. This study opens a new avenue in designing mechanically strong microwave absorbers with a suitable combination of materials.

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“…[24,[26][27][28][29][30][31][32][33][34][35] Graphene/polymer nanocomposites were processed using different processing technique i.e. melt mixing, solution mixing, in-situ polymerization and/or combination of them.…”

Section: Graphene Based Polymer Nanocompositesmentioning

confidence: 99%

Tailoring the interface in graphene/thermoset polymer composites: A critical review

Rohini

Katti

Bose

2015

Polymer

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A unique strategy towards high dielectric constant and low loss with multiwall carbon nanotubes anchored onto graphene oxide sheets

Abstract: Multiwall carbon nanotubes (MWNTs) were anchored onto graphene oxide sheets (GOs) via diazonium and C–C coupling reactions and characterized by spectroscopic and electron microscopic techniques.

Cited by 16 publications

References 34 publications

Simultaneous enhancement in mechanical strength, electrical conductivity, and electromagnetic shielding properties in PVDF–ABS blends containing PMMA wrapped multiwall carbon nanotubes

Simultaneous enhancement in mechanical strength, electrical conductivity, and electromagnetic shielding properties in PVDF–ABS blends containing PMMA wrapped multiwall carbon nanotubes

Tailor-Made Distribution of Nanoparticles in Blend Structure toward Outstanding Electromagnetic Interference Shielding

Tailoring the interface in graphene/thermoset polymer composites: A critical review

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