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.
The present work reports nanocomposite of CdSe/V 2 O 5 core-shell quantum dots with reduced graphene oxide (rGO-V-CdSe), as an efficient lightweight electromagnetic wave shielding material, synthesized by a simplistic solvothermal approach. The as-synthesized nanocomposite was analyzed for its structural, compositional and morphological features by x-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy and x-ray photoelectron spectroscopy (XPS). The measurement of complex permittivity/permeability and total shielding efficiency of the as-synthesized samples has been done in a wide frequency range of 8-12 GHz (X-band). Compared to rGO and rGO-CdSe, rGO-V-CdSe nanocomposite exhibits significantly enhanced EMI shielding properties in terms of both dielectric loss and total shielding SE T . The high value of real permittivity (average ε′∼70) and the overall shielding effectiveness up to ∼38 dB have been recorded for rGO-V-CdSe nanocomposite. The studies also infer that the absorption contributes more in total shielding than reflection. The high value of dielectric loss and shielding effectiveness could also be attributed to the presence of various defects leading to dipolar and interfacial polarizations. The excellent EMI shielding properties of the nanocomposite in GHz frequency range (X-band) pave an intuitive way for fabricating a versatile EMI shielding nanocomposite material for applications.
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