Hydro-tunable CZTO/SWCNT/PVA/PDMS hybrid composites for smart green EMI shielding

Abstract

Despite numerous available materials, the advancement of core high-end electronic technologies in automation and defense, etc., proposed an urgent demand for the development of external stimulus tunable smart electromagnetic interference...

Ionic liquid-dispersed PDMS/SWCNT/Ag@Ni hybrid composite for temperature- and pressure-sensitive smart electromagnetic shielding applications

“…Additionally, the SWCNTs also exhibited ferromagnetic behaviour due to the presence of a high level of catalytic magnetic elemental impurities and structural defects, as revealed in our previous study. 17…”

“…17 Hence, electrical conductivity is a necessary factor but not a sufficient condition for achieving a high shielding performance. 17 Fig. 1d depicts the variation in the DC electrical conductivity ( σ DC ) of S2 [PDMS/Ag@Ni (1 wt%)/SWCNT (0.5 wt%), refer to Table S1, in ESI†], SW (S2 with 18.32 wt% water loading), KIL3 (at 24 °C and 100 °C), and KIL3F composites (refer to Table 1).…”

“…However, the entire loss in terms of dielectric and magnetic losses are defined in a single entity, i.e. , by the attenuation constant computed for all samples using eqn (1), as follows: 3,17,18 where f is the frequency and c is the light velocity. The concentration-dependent α results for the studied composites are displayed in Fig.…”

“…This can be understood by following the effective medium theory, where the enlarged effective shielding medium due to the thermal expansion enhances both ε ′ and μ ′. 17,32…”

“…Additionally, the SWCNTs also exhibited ferromagnetic behaviour due to the presence of a high level of catalytic magnetic elemental impurities and structural defects, as revealed in our previous study. 17 Principally, electrical conductivity is an important prerequisite in controlling reflection shielding. However, in polymer composites, the reflection shielding is seriously affected by the dielectric and magnetic nature of the matrix.…”