Carbon black incorporated carbon nanofiber based polydimethylsiloxane composite for electromagnetic interference shielding

Sharma, Govind Kumar; James, Nirmala Rachel

doi:10.1016/j.cartre.2022.100177

Cited by 24 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is a large demand for these materials in both strategic and domestic sectors. The EMI shields work by a combination of reflection and absorption mechanisms. − EMI shielding materials in the porous form are preferred over their dense counterparts as the pores improve the impedance matching leading to the easy penetration of EM waves into the material and enhances the EM absorption due to the availability of more surface. The waves that penetrate the shielding material undergo multiple internal reflections within the pores leading to enhanced absorption. ,, Recently, carbon-based foams are attracting renewed interest as EMI shields over their metallic counterparts because they are lightweight, noncorroding, inexpensive, and easy to fabricate.…”

Section: Resultsmentioning

confidence: 99%

Carbon Foams by Solid State Foaming of Short Vermicelli Bonded by Phenol-Formaldehyde for Thermal Insulation and Electromagnetic Interference Shielding

Saraswathy

Sharma

Prabhakaran

2023

ACS Appl. Eng. Mater.

Self Cite

View full text Add to dashboard Cite

A simple method of production of carbon foams by randomly assembling short vermicelli rods and bonding them using phenol-formaldehyde (PF) followed by foaming in the solid state during carbonization has been reported. The brittle vermicelli becomes ductile in the range of 200−250 °C during carbonization, which facilitates the nucleation and growth of bubbles in the solid state due to the water vapor generated by the -OH condensation of starch. The dense PF coating on the vermicelli surface facilitates the enlargement of cells by restricting the escape of water vapor during the solid state foaming. The dense carbon produced from the PF binds the carbonized vermicelli rods, affording structural integrity and mechanical strength. The foam body consists of open intervermicelli void space and closed cellular pores in the carbonized vermicelli rods. A broad cell size range of 4−142 μm with an average value of 29.2 μm is observed. The density, compressive strength, and thermal conductivity of the carbon foam are modulated in the ranges of 0.30−0.34 g cm −3 , 0.63−1.6 MPa, and 0.162−0.222 W m −1 K −1 , respectively, by changing the PF solution concentration in the range of 50−90 vol %. The carbon foams exhibit absorption-dominated electromagnetic interference shielding with total shielding effectiveness and specific shielding effectiveness in the ranges of 47.5−65.6 dB and 155.2−192.9 dB cm 3 g −1 , respectively, for the X band (8.2−12.4 GHz).

show abstract

Section: Resultsmentioning

confidence: 99%

Carbon Foams by Solid State Foaming of Short Vermicelli Bonded by Phenol-Formaldehyde for Thermal Insulation and Electromagnetic Interference Shielding

Saraswathy

Sharma

Prabhakaran

2023

ACS Appl. Eng. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Solid fibers will develop as the melt cools down or solvent evaporates from the whipping action that happens throughout the flight time from the Taylor cone to the collector, depending on the liquid viscosity. As a result, the collector is covered with a non-woven fiber mat [32][33][34][35].…”

Section: Principlementioning

confidence: 99%

Electrospinning: The Technique and Applications

Sharma¹,

James²

2023

Recent Developments in Nanofibers Research

View full text Add to dashboard Cite

Electrospinning is a useful and convenient method for producing ultrathin fibers. It has grabbed the scientific community’s interest due to its potential to produce fibers with various morphologies. Numerous efforts have been made by researchers and industrialists to improve the electrospinning setup and the associated techniques in order to regulate the morphology of the electrospun fibers for practical applications. Porous, hollow, helical, aligned, multilayer, core-shell, and multichannel fibers have been fabricated for different applications. This chapter aims to provide readers with a clear understanding of the electrospinning process: its principle, methodology, materials, and applications. The chapter begins with a brief introduction to the history of electrospinning, followed by a discussion of its principle and the basic components of electrospinning setup. The parameters that affect the electrospinning process such as operating parameters and the properties of the material being electrospun are discussed briefly. An overview of the different types of electrospinning technique, capable of producing nanofibers with different morphologies, is also presented. Afterward, the applications of electrospun nanofibers, including their use in biomedical applications, filtration, energy sectors, and sensors applications are discussed succinctly. The perspectives on the challenges, opportunities, and new directions for future development of electrospinning technology are also offered.

show abstract

“…Electrospinning is one of the best methods to produce nanofibers in large scale. [3,4,6,82,[150][151][152] Lai et al [81] fabricated a composite with hydrophilically-engineered electrospun glycerol grafted polyacrylonitrile (PAN) nanofiber (GPNF) and PEDOT: PSS using fabric shrink strategy for EMI shielding in X-band. The conductive nanofiber films of PEDOT: PSS /GPNF composites were prepared by dip-coating.…”

Section: Pedot: Pss Based Composites Without Fillers For Emi Shieldingmentioning

confidence: 99%

“…[34,36,37] To achieve this, researchers focus on carbonic fillers and carbon-based materials as replacements for metals. [3] However, carbon-based composites are not stretchable or flexible, making them difficult to mold or design according to electronic devices. On the other hand, polymer-based composites can efficiently be prepared as stretchable, flexible, and lightweight materials for EMI shielding.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Poly (3,4‐Ethylene Dioxythiophene): Polystyrene Sulfonate Based Composite Materials for Electromagnetic Interference Shielding

Sharma,

Joseph,

James

2023

Adv Materials Technologies

Self Cite

View full text Add to dashboard Cite

Recent technological developments have made the emission of electromagnetic (EM) radiation a significant source of electromagnetic interference (EMI). These EMIs consist of stray EM radiations that damage and malfunction electronics and telecommunication systems. Scientists have made countless efforts to solve these problems. The demand for EMI shielding materials is fast growing due to the increasing complexity of the EM environment and EMI. Poly(3,4‐ethylenedioxythiophene): polystyrene sulfonate (PEDOT: PSS) is an intrinsically conductive polymer that has attracted attention due to its high electrical conductivity, processability, and environmental stability. The use of PEDOT:PSS as a shielding material for EMI is a promising alternative to traditional metal‐based materials. This review provides an overview of different strategies explored for the preparation of PEDOT: PSS‐based composites for EMI shielding and the use of carbonic fillers, metal and metal nanoparticles, magnetic particles, and MXenes in these composites. The advantages and disadvantages of different approaches are discussed, and future perspectives for the development of PEDOT:PSS composites for EMI shielding are presented. The paper concludes that PEDOT‐PSS‐based composites offer significant potential for the development of lightweight, thin, flexible, and cost‐effective green EMI shielding materials, and continued research in this field can lead to their widespread commercialization and adoption.

show abstract

Carbon black incorporated carbon nanofiber based polydimethylsiloxane composite for electromagnetic interference shielding

Cited by 24 publications

References 41 publications

Carbon Foams by Solid State Foaming of Short Vermicelli Bonded by Phenol-Formaldehyde for Thermal Insulation and Electromagnetic Interference Shielding

Carbon Foams by Solid State Foaming of Short Vermicelli Bonded by Phenol-Formaldehyde for Thermal Insulation and Electromagnetic Interference Shielding

Electrospinning: The Technique and Applications

Recent Progress in Poly (3,4‐Ethylene Dioxythiophene): Polystyrene Sulfonate Based Composite Materials for Electromagnetic Interference Shielding

Contact Info

Product

Resources

About