Electromagnetic interference shielding performance of waterborne polyurethane composites filled with silver nanoparticles deposited on functionalized graphene

[Display omitted] •Functional reduced graphene oxide (FRGO) was functionalized through free radical polymerization before chemical reduction to prevent restacking and aggregation during the reduction.•The composite exhibited the highest conductivity and electromagnetic interference shielding perform...

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Bibliographic Details
Published in:Applied surface science 2016-11, Vol.385, p.436-444
Main Authors: Lin, Sheng-Chi, Ma, Chen-Chi M., Hsiao, Sheng-Tsung, Wang, Yu-Sheng, Yang, Chih-Yu, Liao, Wei-Hao, Li, Shin-Ming, Wang, Jeng-An, Cheng, Tzu-Yu, Lin, Chih-Wen, Yang, Ruey-Bin
Format: Article
Language:English
Subjects:
Electrical conductivity
Electrical resistivity
Electromagnetic interference
Electromagnetic interference shielding
electromagnetic interference shielding materials shielding effectiveness (EMI SE)
Graphene
Grpahene oxide
Nanoparticles
Polyurethane resins
Silver
silver nanoparticles
water-borne polyurethane
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Summary:[Display omitted] •Functional reduced graphene oxide (FRGO) was functionalized through free radical polymerization before chemical reduction to prevent restacking and aggregation during the reduction.•The composite exhibited the highest conductivity and electromagnetic interference shielding performance. The objective of this study was to prepare an electromagnetic interference shielding material, waterborne polyurethane (WPU) filled with silver-nanoparticle-decorated functional reduced graphene oxide (Ag@FRGO). Functional reduced graphene oxide (FRGO) was functionalized through free-radical polymerization before chemical reduction, to prevent restacking and aggregation during the reduction. After the functionalization, the homogeneous dispersion of FRGO promoted the formation of conductive networks throughout the WPU matrix. To enhance the electrical conductivity and electromagnetic interference shielding effectiveness (EMI SE) of the composites, silver nanoparticles (Ag NPs) were deposited on the FRGO surface. Subsequently, WPU composites were synthesized through the solution-mixing method. Their microstructure, morphology, electrical conductivity, and EMI SE were investigated, and the results showed that, among Ag@FRGO/WPU composites with different values for the weight ratio of Ag NPs to FRGO, the Ag@FRGO/WPU composite with 5wt% FRGO and a weight ratio of Ag to NPs of 10:1 (10Ag@FRGO/WPU) exhibited the highest electrical conductivity (25.52S/m) and an EMI SE of 35dB in the frequency range of 8.2–12.4GHz (X-band).
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.05.063