Electrical properties and electromagnetic interference shielding effectiveness of multiwalled carbon nanotubes‐reinforced EMA nanocomposites

Abstract

Electrical and electromagnetic interference shielding effectiveness (EMI SE) properties of the ethylene methyl acrylate (EMA)/multiwalled carbon nanotube (MWNT) nanocomposites have been studied. High resolution transmission electron microscope (HRTEM) was used to validate the MWNTs dispersion state and network connections of its microstructure. The electrical resistance of the nanocomposites decreases significantly with MWNTs content. DC resistivity and AC conductivity measurement on the nanocomposite samples showed that the insulator to conductor transition took place within 10 wt% MWNTs concentration. It has been found that as MWNT concentration increased network connections improved. The EMI SE of the nanocomposites has also been investigated. The highest SE (∼20 dB) of these nanocomposites is realistic for an industrial application. EMA/MWNT nanocomposites provide sufficient intrinsic EMI shielding capability which may be hopeful for electrical and electronic applications. The morphology correlates well with the electrical and electromagnetic behavior of these nanocomposites. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

Synergistic effect of double percolated co‐supportive MWCNT‐CB conductive network for high‐performance EMI shielding application

“…The sample with 0.5‐mm thickness shows an efficiency of −26.4 dB which is improved to −41.1 dB when the sample thickness is increased to 2 mm. The increase in the thickness of the hybrid composite increases the number of conductive layers and interfacial area facilitating more interaction with the incoming EM radiation, thereby enhancing EMI SE . In order to evaluate the serviceability of the newly developed material, bending test was performed.…”

“…The increase in the thickness of the hybrid composite increases the number of conductive layers and interfacial area facilitating more interaction with the incoming EM radiation, thereby enhancing EMI SE. 23,56 In order to evaluate the serviceability of the newly developed material, bending test was performed. The hybrid composite of 1-mm thickness containing the highest fraction of MWCNT was subjected to 500 times bending, and its total EMI SE was measured.…”

“…Mondal et al used ketjen black in chlorinated PE (CPE) matrix and attained EMI shielding efficiency (EMI SE) of −21.2 dB with 20 wt% of filler loading . Basuli et al reported EMI SE of EMA/CNT composite . Yang et al demonstrated the preparation of porous polyimide/in‐situ reduced GO composite films for EMI shielding …”

“…21 Le et al also accounted the high conductivity of polymer composite with low amount of CNT. 22 23 Yang et al demonstrated the preparation of porous polyimide/in-situ reduced GO composite films for EMI shielding. 24 In designing CPCs, electrical percolation threshold, ie, is the minimum amount of filler particle required to establish a continuous conductive network, is of a major concern.…”

Carbon Nanostructure‐Based Scale Sensors Using Inkjet Printing and Casting Techniques

“…Their nanostructures exhibit many interesting and often unique properties, and hence, they can be used in many novel technological and industrial applications. Due to their unique electrical and electronic properties, CNTs are considered for various next-generation device applications, that is nanofluids [1][2][3], scanning probes [4], nanocomposites [5][6][7][8][9], grease [10,11], electron magnetic shielding interface [12][13][14][15][16], solar thermal absorbers [17] and sensors [18][19][20][21][22]. The electrical resistance of the carbon nanomaterials changes when chemicals in the surrounding make covalent or non-covalent interaction with the carbon nanomaterials.…”