Optimizing electromagnetic interference shielding ofcarbon nanofibersreinforced nylon 6, 6 nanocomposite films in terahertz range

Abstract

The widespread development and usage of electrical and electronic devices in THz frequency band has instigated great concerns regarding the anticipated functioning of devices. The world is in dire need to develop tunable shielding materials which are not only field functional but could also provide shielding against undesired electromagnetic signals by absorption as the primary mechanism. In this work, nylon 6,6 based hybrid nanocomposite films loaded with 0–50 wt% CNFs have been prepared on the cellulosic substrates by air spray coating technique. XRD and FESEM results have established formation of crystalline films having homogeneously distributed CNFs in the polymer matrix leading to formation of an efficient conductive network. IV measurements demonstrate a significant rise in the dc conductivity in the polymer nanocomposite samples with the gradual increase of CNF content in comparison to the pristine sample. Interestingly, sample containing 50 wt% CNFs has shown dc conductivity value of 0.03 Scm−1 while shielding effectiveness (SE) of 44 dB obtained through THz‐TDS. The results hold a distinctive position in these samples which have outperformed at a very low thickness of ~570 μm as compared to the results obtained by many other novel polymer composites and present themselves a light weight field functional high THz absorption materials.

Electron-injection-induced Fe atomic valence transition for efficient terahertz shielding in α-Fe2O3@carbon microtubes

“…5d, we compare our α-Fe 2 O 3 @CMTs powders and corresponding composite films with advanced THz shielding materials reported in the literature, highlighting their significant advantages in terms of high shielding efficiency and minimal thickness (refer to Table S1†). 8,12,21,22,55–62 This exceptional THz shielding performance acquired from our composite samples can be attributed to the enhanced polarization relaxation resulting from modified ionic polarization.…”

Flexible CNT-MXene-CNT Film with Low Surface Conductance for High- and Low-Power Electromagnetic Absorption Protection

“…The polar molecules in the sample exhibit certain orientation polarization below the glass transition temperature, which results in a degree of incident THz EMW dissipation. Conversely, this effect is negligible in the GHz band. − …”

An artificially re-structured PEDOT:PSS/konjac glucomannan sponge toward high-performance electromagnetic interference shielding from gigahertz to terahertz bands

“…(f) Tan d, (g) reflection loss value and (h) absolute value of 1 − Z of CG and PPK sponges. (i) Direct comparison of the THz EMI shielding performance of PPK sponges (marked as star) in this work with those of prevailing materials[14][15][16]45,[58][59][60][61][62][63][64][65] (marked as circles and squares), including MXene-dominated, carbon-dominated, metal-dominated and semiconductor-dominated materials.…”