An anisotropic layer-by-layer carbon nanotube/boron nitride/rubber composite and its application in electromagnetic shielding

Abstract

A carbon nanotube/boron nitride/rubber composite with anisotropic electrical conductivity exhibits an EMI shielding effectiveness of 22.41 dB mm−1 and a thermal conductivity equal to 0.25 W m−1 K−1.

Electric Heating Behavior of Reduced Oxide Graphene/Carbon Nanotube/Natural Rubber Composites with Macro-Porous Structure and Segregated Filler Network

“…During the reduction process of GO, CNTs, and the generated rGO coated the surface of NR particles, and, as a result of the electrostatic and π-π interactions establishing between the latex particles, the water dispersion turns to the rGO/CNT/NR hydrogels. Significantly, the fillers coated on the surface of NR particles give rise to the formation of the segregated network, as shown in several examples as rGO/NR, [ 13 ] Fe 3 O 4 @rGO/NR, [ 22 ] CNT/NR, [ 10 ] and CNT/NR foam [ 31 ] reported by some of authors. In fact, the main reason for the formation of rGO/CNT/NR hydrogel is ascribed to the rGO and CNTs coated NR particles, which, firmly interconnecting to each other through strong interactions, preserve the porous structure against the forces generated by the nitrogen gas evolving during a chemical reduction.…”

“…Electrical energy dissipated by the Joule effect was monitored by IR imaging of the samples’ surface after inputting a voltage [ 4 , 10 ]. The samples’ surface exhibits a somewhat uniform temperature distribution ( Figure 5 a) when input voltages of more than 7 V are applied.…”

“…It is well known that conductive path is related with types and distribution of fillers. The conductive fillers with a high aspect ratio, including carbon based fillers (i.e., carbon nanotube (CNT) [ 4 , 10 ], carbon fiber [ 11 ], graphene, or reduced graphene oxide (rGO) [ 4 , 12 , 13 , 14 ]), MXene [ 15 , 16 ], and silver nanowires [ 1 , 17 ], are commonly utilized in order to construct conductive path with low filler loadings. As compared with MXene, which easily decompose at air and silver nanowires that are significantly expensive, carbon-based fillers meeting the requirement of practical applications owing to their thermal stability and relatively low-cost.…”

“…In fact, alongside with enhanced mechanical properties, this morphology allows a high electrical conductivity with the lowest percolation threshold, as compared with the other morphological organization [ 19 , 20 , 21 ]. Therefore, the past decade has witnessed an almost explosive growth of CPCs with a segregated carbon-based fillers network [ 10 , 13 , 22 , 23 , 24 ]. Yu et al [ 25 ] first demonstrated that the electrical conductivity of CNT/poly(vinyl acetate) increased dramatically after incorporating CNTs in the segregated network.…”

“…Zhan et al [ 4 ] reported that the rGO/natural rubber (NR) composites in which the rGO nanosheets located at the rubber particles interface to construct the segregated network exhibited good electric heating behavior. The steady-state temperature of the composites reached the value of 152 °C at the applied voltage of 20 V. The anisotropic layer-by-layer CNT/boron nitride/NR composites with segregated network, designed by Zhan and his colleagues, showed an ultra-high surface temperature (170 °C) in 30 s under an electric potential of 7.5 V [ 10 ]. Pu et al [ 26 ] found that a segregated CNTs network endowed CNT/polyurethane composites with excellent electric heating behavior, consequently, leading to an extraordinary self-healing property.…”