Nanofiber network with adjustable nanostructure controlled by PVP content for an excellent microwave absorption

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Carbon nanofibers are promising lightweight materials for microwave absorption.
• Controlling nanostructure conductivity is key to enhancing microwave absorption properties.
• Polyvinyl pyrrolidone (PVP) exhibits hygroscopicity, influencing conductive networks in nanofibers.

Purpose of the Study:

• To synthesize adjustable conductive nanostructures of carbon nanofibers using electrospinning.
• To investigate the effect of polyvinyl pyrrolidone (PVP) content on the conductive network and microwave absorption.
• To optimize carbon nanofibers for efficient microwave absorption.

Main Methods:

• Electrospinning technique was employed to synthesize carbon nanofibers.
• Varying the mass ratio of polyacrylonitrile (PAN) and polyvinyl pyrrolidone (PVP) to control conductivity.
• Carbonization of PAN/PVP nanofibers to create the final microwave absorbent structures.

Main Results:

• Carbon nanofibers derived from PAN and PVP (mass ratio 6:4) demonstrated excellent microwave absorption.
• Achieved a minimum reflection loss (RL) of -51.3 dB at 15.2 GHz.
• Obtained a maximum effective absorption frequency width (<-10 dB) of 5.1 GHz at a thickness of 1.8 mm.

Conclusions:

• The study successfully synthesized lightweight carbon nanofibers with tunable conductivity for microwave absorption.
• The optimized PAN/PVP ratio (6:4) provides an effective pathway for creating high-performance microwave absorbents.
• This research offers a viable method for producing advanced lightweight carbon nanofiber-based microwave absorbers.