Abstract
In this work, bacterial cellulose was successively functionalized by magnetron sputtering and RF reactive sputtering with copper (Cu) and Al2O3 to endow it with unique anti-oxidation electromagnetic shielding properties while concomitantly improving hydrophobic, mechanical, and thermal properties. The surface topographies and chemical properties of BC/Cu/Al2O3 nanocomposites were examined by different analysis instruments to conclusively testify that metal-based nanoparticles were evenly deposited on the surfaces. This sandwich structure of the nanocomposites enhanced their thermal stability, hydrophobicity, mechanical properties, and electromagnetic interference (EMI) shielding effectiveness (SE). EMI effects of these nanocomposites were also investigated by the four-point probe, uniaxial testing machine and a vector network analyzer (VNA). The results indicated that the sandwich nanoscale materials showed good mechanical properties (41.3Mpa) and excellent EMI shielding (65.3dB).
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