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Erschienen in:
08.03.2021
Effect of temperature on the microwave absorbing properties of SiO2/CNTs composite
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 7/2021
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Abstract
In this work, SiO2/CNTs nano-composites were synthesized by the modified Stöber method for exploring the microwave absorbing performance at gradient temperatures. The SEM results show that the as-prepared SiO2 particles have spherical morphology, with a diameter of 100 nm, and the carbon nanotubes in the powder are interlaced. With increasing temperature, more and more SiO2 spheres were seen to attach to the carbon nanotubes, and the increase in conductivity was ascribed to the increase in carrier concentration. Ascribed to the enhanced conductivity and the increasing interface between the SiO2 particles and the carbon nanotubes, the real and imaginary parts of the complex permittivity were seen to gradually increase, contributing to the improving attenuation. Hence, the sample tested at 400 °C exhibited optimal microwave absorbing performance with a minimum reflection loss (RL) of − 9.76 dB and a bandwidth (RL < − 4 dB) of 4.1 GHz at a thickness of 2 mm, which basically covers the entire 8.2–12.4 GHz (X-band).