Filter paper templated one-dimensional NiO/NiCo₂O₄ microrod with wideband electromagnetic wave absorption capacity

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Filter paper, a low-cost material, can act as a template for synthesizing one-dimensional (1D) nanostructures.
• Developing efficient electromagnetic (EM) wave absorbers is crucial for modern electronic devices.

Purpose of the Study:

• To fabricate a 1D NiO/NiCo2O4 composite using filter paper as a template.
• To investigate the EM wave absorption performance of the synthesized composite.
• To explore the influence of calcination temperature and precursor dosage on absorption properties.

Main Methods:

• Adsorption of nickel and cobalt acetate onto filter paper.
• Calcination of the precursor-loaded filter paper at various temperatures.
• Characterization of the resulting NiO/NiCo2O4 composite.
• Evaluation of electromagnetic wave absorption performance.

Main Results:

• A 1D NiO/NiCo2O4 composite was successfully synthesized.
• Electromagnetic wave absorption performance was tunable by adjusting calcination temperature and metal salt dosage.
• Optimized absorber (600°C, 2 mmol Ni acetate, 4 mmol Co acetate) achieved a 6.08 GHz absorption bandwidth at 1.88 mm thickness.
• Minimum reflection loss reached -57.4 dB with optimized thickness.

Conclusions:

• Filter paper serves as an effective and simple template for fabricating 1D metal oxide composites.
• The facile synthesis route yields high-performance electromagnetic wave absorbers.
• This method provides inspiration for developing other 1D EM wave absorbing materials.