Effect of silver incorporation into PVDF-barium titanate composites for EMI shielding applications

[Display omitted] ► PVDF composite with nano BaTiO3, micro BaTiO3 and silver were prepared. ► The PVDF-BaTiO3-Ag composite exhibits shielding effectiveness of about 26dB. ► PVDF-nano BaTiO3-Ag composites shield mainly by absorption. ► Easily tunable, low cost EMI shielding material is obtained in th...

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Bibliographic Details
Published in:Materials research bulletin 2013-04, Vol.48 (4), p.1681-1687
Main Authors: Joseph, Nina, Singh, Santosh Kumar, Sirugudu, Roopas Kiran, Murthy, Vemuri Rama Krishna, Ananthakumar, Solaiappan, Sebastian, Mailadil Thomas
Format: Article
Language:English
Subjects:
A. Ceramics
A. Composites
A. Metals
A. Polymers
Barium titanates
D. Dielectric properties
Electromagnetic interference
Nanocomposites
Nanomaterials
Nanostructure
Polyvinylidene fluorides
Shielding
Silver
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Summary:[Display omitted] ► PVDF composite with nano BaTiO3, micro BaTiO3 and silver were prepared. ► The PVDF-BaTiO3-Ag composite exhibits shielding effectiveness of about 26dB. ► PVDF-nano BaTiO3-Ag composites shield mainly by absorption. ► Easily tunable, low cost EMI shielding material is obtained in the X band. ► PVDF-nano BaTiO3-Ag composites exhibit broad shielding band width over X band. Composites of polyvinylidene fluoride (PVDF) with micron and nano sized BaTiO3 powders were developed for electromagnetic interference (EMI) shielding applications in the X band. PVDF-nano BaTiO3 composites show better shielding property compared to PVDF-micron sized BaTiO3 composites. The composite of PVDF with 40vol% of nano BaTiO3 showed the best EMI shielding effectiveness and is about 9dB. The contributions from reflection and absorption to the total EMI shielding effectiveness is same for the PVDF-BaTiO3 composites. Addition of small amount of silver particles improved the shielding properties of these composites due to the increased conductivity. An EMI shielding effectiveness of about 26dB is obtained in the measured frequency range for the PVDF-20vol% nano BaTiO3-10vol% Ag composite of thickness 1.2mm. Novel three phase composite combining the advantages of metal, nano ceramic and polymer is obtained with the potential for effective EMI shielding applications.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2012.11.115