Photographs of CBSP@CNFs PDMS composite (a-d), EMI SE of CBSP@CNFs (e) and CBSP@CNFs (e) and PDMS composites (f-g)

Carbon nanofibers (CNFs) incorporated with carbon black super P (CBSP@CNFs) and their polydimethylsiloxane (PDMS) composites were fabricated using a combination of electrospinning followed by heat treatment and manual lay-up process. The high electrical conductivity of 2.5 S cm-1 imparted excellent EMI shielding property to CBSP@CNFs. With a thickness of 0.06 mm and a density of 0.63 g cm-3, CBSP@CNFs exhibited high EMI shielding effectiveness (EMI SE) over a wide frequency range (8.2-26.5 GHz). The highest and average values of EMI SE in the range were 55.8 and 50.7 dB respectively. Composites of CBSP@CNFs with PDMS also showed similar behaviour, which is remarkably higher than the most reported EMI shielding materials. These results suggest that CBSP@CNFs and their PDMS composites would be promising for applications as thin, flexible, stretchable, and light weight EMI shielding materials.

Ref: Sharma GK, James NR (2022). Carbon black incorporated carbon nanofiber based polydimethylsiloxane composites for electromagnetic interference shielding. Carbon Trends (8) 100177. https://doi.org/10.1016/j.cartre.2022.100177