Electromagnetic
interference (EMI) pollution has now become a subject
of great concern with the rapid development of delicate electronic
equipment in commercial, civil, and military operations. There has
been a surge in pursuit of light-weight, adaptable, effective, and
efficient EMI screening materials in recent years. The present article
addresses a simple and sensitive approach to synthesize a core/shell
carbon nanotube/MoS2 heterostructure supported on reduced
graphene oxide (CNT/MoS2-rGO nanohybrid) as an efficient
electromagnetic shielding material. The structural and morphological
characteristics were accessed through X-ray diffraction, transmission
electron microscopy, scanning electron microscopy, and Raman spectroscopy,
augmenting successful formation of the CNT/MoS2-rGO nanohybrid.
The shielding performance of the as-synthesized samples has been accessed
in a wide frequency range of 8–12 GHz. A CNT/MoS2-rGO nanohybrid demonstrates a better EMI shielding performance in
comparison to MoS2 nanosheets and MoS2-rGO nanohybrid
individually. The CNT/MoS2-rGO nanohybrid having a thickness
∼1 mm shows excellent total shielding effectiveness (SET) as high as 40 dB, whereas MoS2 and MoS2-rGO hybrid lags far, with the average value of SET as
7 and 28 dB, respectively. It also demonstrates that the nanohybrid
CNT/MoS2-rGO shields the EM radiation by means of absorption
through several functional defects and multiple interfaces present
in the heterostructure. Herein, we envision that our results provide
a simple and innovative approach to synthesize the light-weight CNT/MoS2-rGO nanohybrid having flexibility and high shielding efficiency
and widen its practical applications in stealth technology.
Tem images (above) and release profiles (below) of encapsulated drug from ormosil nanoparticles with small (orm-s), medium (orm-m) and large (orm-l) sizes.
In this study, ternary composites of polyaniline (PANI) with manganese dioxide (MnO2) nanorods and carbon nanotubes (CNTs) were prepared by employing a hydrothermal methodology and in-situ oxidative polymerization of aniline. The morphological analysis by scanning electron microscopy showed that the MnO2 possessed nanorod like structures in its pristine form, while in the ternary PANI@CNT/MnO2 composite, coating of PANI over CNT/MnO2, rods/tubes were evidently seen. The structural analysis by X-ray diffraction and X-ray photoelectron spectroscopy showed peaks corresponding to MnO2, PANI and CNT, which suggested efficacy of the synthesis methodology. The electrochemical performance in contrast to individual components revealed the enhanced performance of PANI@CNT/MnO2 composite due to the synergistic/additional effect of PANI, CNT and MnO2 compared to pure MnO2, PANI and PANI@CNT. The PANI@CNT/MnO2 ternary composite exhibited an excellent specific capacity of 143.26 C g−1 at a scan rate of 3 mV s−1. The cyclic stability of the supercapattery (PANI@CNT/MnO2/activated carbon)—consisting of a battery type electrode—demonstrated a gradual increase in specific capacity with continuous charge–discharge over ~1000 cycles and showed a cyclic stability of 119% compared to its initial value after 3500 cycles.
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