Morphological, electrical and electromagnetic interference shielding characterization of vapor grown carbon nanofiber/polystyrene nanocomposites

2012 ◽  
Vol 62 (4) ◽  
pp. 601-607 ◽  
Author(s):  
Mohammed H Al-Saleh ◽  
Uttandaraman Sundararaj
Keyword(s):  
Electromagnetic Interference ◽  
Carbon Nanofiber ◽  
Electromagnetic Interference Shielding ◽  
Vapor Grown Carbon Nanofiber

Impedance analysis and electromagnetic interference shielding effectiveness of vapor grown carbon nanofiber reinforced chlorobutyl rubber composites

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
V. Sridhar ◽  
Deng Xu ◽  
D.K. Tripathy ◽  
Jin Kuk Kim
Keyword(s):  
Polymer Matrix ◽  
Electromagnetic Interference ◽  
Carbon Nanofiber ◽  
Complex Impedance ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Subsequent Decrease ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
Vapor Grown Carbon Nanofiber

AbstractThe effect of processing variables (filler loadings) and operating variables (frequency) on the impedance and electromagnetic interference shielding effectiveness of vapor grown carbon nanofiber (VGCNF) reinforced chlorobutyl vulcanizates has been investigated. The dispersion and morphology of the VGCNF in the polymer matrix has been studied by scanning electron microscopy and Raman spectra. Addtionally, the utility of EPMA (Electron probe microanalyzer) as a tool to study the dispersion of nano fibers in polymer matrix has been explored for the first time. With increase in frequency and VGCNF loadings the composites showed a decrease in real part of complex impedance for increasing VGCNF loadings whereas the imaginary part showed a slight peak in the range of 9-10 GHz followed by a subsequent decrease. The measured impedance values were plotted as Nyquist plots (Argand diagrams) and a Resistor-Capacitance model was assumed. The EMI shielding effectiveness increased monotonically with filler loading and showed a maximum of around 55 dB at 12 phr loadings, thus making them suitable for EMI shielding applications.

Creep characterization of vapor-grown carbon nanofiber/vinyl ester nanocomposites using a response surface methodology

2015 ◽  
Vol 132 (26) ◽  
pp. n/a-n/a
Author(s):  
Daniel A. Drake ◽  
Rani W. Sullivan ◽  
Thomas E. Lacy ◽  
Charles U. Pittman ◽  
Hossein Toghiani ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Vinyl Ester ◽  
Carbon Nanofiber ◽  
Vapor Grown Carbon Nanofiber

Electromagnetic Interference Shielding Characteristics of Carbon Nanofiber-Polymer Composites

2007 ◽  
Vol 7 (2) ◽  
pp. 549-554
Author(s):  
Yonglai Yang ◽  
Mool C. Gupta ◽  
Kenneth L. Dudley ◽  
Roland W. Lawrence
Keyword(s):  
Electromagnetic Interference ◽  
Carbon Nanofiber ◽  
Frequency Region ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Frequency Independent ◽  
Ku Band

Electromagnetic interference (EMI) shielding characteristics of carbon nanofiber-polystyrene composites were investigated in the frequency range of 12.4–18 GHz (Ku-band). It was observed that the shielding effectiveness of such composites was frequency independent, and increased with increasing carbon nanofiber loading within Ku-band. The experimental data exhibited that the shielding effectiveness of the polymer composite containing 20 wt% carbon nanofibers could reach more than 36 dB in the measured frequency region, indicating such composites can be applied to the potential EMI shielding materials. In addition, the results showed that the contribution of reflection to the EMI shielding effectiveness was much larger than that of absorption, implying the primary EMI shielding mechanism of such composites was reflection of electromagnetic radiation within Ku-band.

A flexible sandwich graphene/silver nanowires/graphene thin film for high-performance electromagnetic interference shielding

RSC Advances ◽  
2016 ◽  
Vol 6 (103) ◽  
pp. 101283-101287 ◽  
Author(s):  
Pradip Kumar ◽  
Faisal Shahzad ◽  
Soon Man Hong ◽  
Chong Min Koo
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Silver Nanowires ◽  
Electromagnetic Interference Shielding

We report the preparation and characterization of flexible graphene/silver nanowires (AgNWs)/graphene sandwich thin films for high-performance electromagnetic interference shielding.

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