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Inorganic nanotubes reinforced polyvinylidene fluoride composites as low-cost electromagnetic interference shielding materials.

Eswaraiah V, Sankaranarayanan V, Ramaprabhu S - Nanoscale Res Lett (2011)

Bottom Line: Homogeneous distribution of f-MWCNTs and MNTs in PVDF matrix were confirmed by field emission scanning electron microscopy.The addition of 2 wt.% of MNTs (2 wt.%, f-MWCNTs) to PVDF matrix results in an increase in the electrical conductivity from 10-16S/m to 4.5 × 10-5S/m (3.2 × 10-1S/m).EMI SE of approximately 20 dB has been obtained with the addition of 5 wt.% MNTs-1 wt.% f-MWCNTs to PVDF in comparison with EMI SE of approximately 18 dB for 7 wt.% of f-MWCNTs indicating the potential use of the present MNT/f-MWCNT/PVDF composite as low-cost EMI shielding materials in X-band region.

View Article: PubMed Central - HTML - PubMed

Affiliation: Alternative Energy and Nanotechnology Laboratory (AENL), Nano Functional Materials, Technology Centre (NFMTC), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India. ramp@iitm.ac.in.

ABSTRACT
Novel polymer nanocomposites comprising of MnO2 nanotubes (MNTs), functionalized multiwalled carbon nanotubes (f-MWCNTs), and polyvinylidene fluoride (PVDF) were synthesized. Homogeneous distribution of f-MWCNTs and MNTs in PVDF matrix were confirmed by field emission scanning electron microscopy. Electrical conductivity measurements were performed on these polymer composites using four probe technique. The addition of 2 wt.% of MNTs (2 wt.%, f-MWCNTs) to PVDF matrix results in an increase in the electrical conductivity from 10-16S/m to 4.5 × 10-5S/m (3.2 × 10-1S/m). Electromagnetic interference shielding effectiveness (EMI SE) was measured with vector network analyzer using waveguide sample holder in X-band frequency range. EMI SE of approximately 20 dB has been obtained with the addition of 5 wt.% MNTs-1 wt.% f-MWCNTs to PVDF in comparison with EMI SE of approximately 18 dB for 7 wt.% of f-MWCNTs indicating the potential use of the present MNT/f-MWCNT/PVDF composite as low-cost EMI shielding materials in X-band region.

No MeSH data available.


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FTIR spectra of purified and functionalized MWCNTs.
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Figure 3: FTIR spectra of purified and functionalized MWCNTs.

Mentions: Figure 3 shows the FTIR spectra of purified and functionalized MWCNTs (f-MWCNTs). The broad absorption band at 3,438 cm-1 is attributed to the hydroxyl group (νOH). The asymmetric and symmetric stretching of CH bonds are observed at 2,927 and 2,853 cm-1, respectively and the stretching of C = O of the carboxylic acid (-COOH) group is observed at 1,734 cm-1. The stretching of C = C, O-H bending deformation in -COOH and CO bond stretching in the f-MWCNTs are observed at 1,635 cm-1; 1,436 cm-1; and 1,073 cm-1; respectively indicating that carboxyl and hydroxyl functional groups were attached to the surface of MWCNTs.


Inorganic nanotubes reinforced polyvinylidene fluoride composites as low-cost electromagnetic interference shielding materials.

Eswaraiah V, Sankaranarayanan V, Ramaprabhu S - Nanoscale Res Lett (2011)

FTIR spectra of purified and functionalized MWCNTs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211184&req=5

Figure 3: FTIR spectra of purified and functionalized MWCNTs.
Mentions: Figure 3 shows the FTIR spectra of purified and functionalized MWCNTs (f-MWCNTs). The broad absorption band at 3,438 cm-1 is attributed to the hydroxyl group (νOH). The asymmetric and symmetric stretching of CH bonds are observed at 2,927 and 2,853 cm-1, respectively and the stretching of C = O of the carboxylic acid (-COOH) group is observed at 1,734 cm-1. The stretching of C = C, O-H bending deformation in -COOH and CO bond stretching in the f-MWCNTs are observed at 1,635 cm-1; 1,436 cm-1; and 1,073 cm-1; respectively indicating that carboxyl and hydroxyl functional groups were attached to the surface of MWCNTs.

Bottom Line: Homogeneous distribution of f-MWCNTs and MNTs in PVDF matrix were confirmed by field emission scanning electron microscopy.The addition of 2 wt.% of MNTs (2 wt.%, f-MWCNTs) to PVDF matrix results in an increase in the electrical conductivity from 10-16S/m to 4.5 × 10-5S/m (3.2 × 10-1S/m).EMI SE of approximately 20 dB has been obtained with the addition of 5 wt.% MNTs-1 wt.% f-MWCNTs to PVDF in comparison with EMI SE of approximately 18 dB for 7 wt.% of f-MWCNTs indicating the potential use of the present MNT/f-MWCNT/PVDF composite as low-cost EMI shielding materials in X-band region.

View Article: PubMed Central - HTML - PubMed

Affiliation: Alternative Energy and Nanotechnology Laboratory (AENL), Nano Functional Materials, Technology Centre (NFMTC), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India. ramp@iitm.ac.in.

ABSTRACT
Novel polymer nanocomposites comprising of MnO2 nanotubes (MNTs), functionalized multiwalled carbon nanotubes (f-MWCNTs), and polyvinylidene fluoride (PVDF) were synthesized. Homogeneous distribution of f-MWCNTs and MNTs in PVDF matrix were confirmed by field emission scanning electron microscopy. Electrical conductivity measurements were performed on these polymer composites using four probe technique. The addition of 2 wt.% of MNTs (2 wt.%, f-MWCNTs) to PVDF matrix results in an increase in the electrical conductivity from 10-16S/m to 4.5 × 10-5S/m (3.2 × 10-1S/m). Electromagnetic interference shielding effectiveness (EMI SE) was measured with vector network analyzer using waveguide sample holder in X-band frequency range. EMI SE of approximately 20 dB has been obtained with the addition of 5 wt.% MNTs-1 wt.% f-MWCNTs to PVDF in comparison with EMI SE of approximately 18 dB for 7 wt.% of f-MWCNTs indicating the potential use of the present MNT/f-MWCNT/PVDF composite as low-cost EMI shielding materials in X-band region.

No MeSH data available.


Related in: MedlinePlus