Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 13, Pages 10667-10678Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am502412q
Keywords
graphene nanosheet; water-borne polyurethane; electromagnetic interference shielding; electrical conductivity; layer-by-layer assembly
Funding
- National Science Council, Taiwan [NSC 101-2221-E-007-031-(102), NSC 102-2622-E-007-024-CC3]
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In this study, we developed a simple and powerful method to fabricate flexible and lightweight graphene-based composites that provide high electromagnetic interference (EMI) shielding performance. Electrospun waterborne polyurethane (WPU) that featured sulfonate functional groups was used as the polymer matrix, which was light and flexible. First, graphene oxide (GO)/WPU composites were prepared through layer-by-layer (L-b-L) assembly of two oppositely charged suspensions of GO, the cationic surfactant (didodecyldimethylammonium bromide, DDAB)-adsorbed GO and intrinsic negatively charged GO, depositing on the negatively charged WPU fibers. After the L-b-L assembly cycles, the GO bilayers wrapped the WPU fiber matrix completely and revealed fine connections guided by the electrospun WPU fibers. Then, we used hydroiodic acid (HI) to obtain highly reduced GO (r-GO)/WPU composites, which exhibited substantially enhanced electrical conductivity (approximately 16.8 S/m) and, moreover, showed a high EMI-shielding effectiveness (approximately 34 dB) over the frequency range from 8.2 to 12.4 GHz.
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