Phosphorus-Driven Heteroatom Doping in Mesoporous Carbon Hollow Platelets Enables Efficient Electromagnetic Wave...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetism

Background:

• Phosphorus (P) doping is a key method for enhancing the electromagnetic properties of carbon materials.
• This involves controlling defect density, dielectric polarization, and electrical conductivity.

Purpose of the Study:

• To synthesize porous phosphorus-doped carbon hollow platelets (PCHPs) with controlled morphologies.
• To investigate the structure-property-performance relationships for electromagnetic wave absorption.

Main Methods:

• Template-assisted polymerization followed by hydrothermal phosphorylation and calcination.
• Systematic adjustment of phosphorus content and calcination temperature.
• Experimental characterizations and theoretical calculations (e.g., CST simulations).

Main Results:

• PCHPs with controlled defect concentration, graphitization, and conductivity were synthesized.
• P doping induced charge redistribution and polarization relaxation via P─C/P─O/P═O bonds.
• Optimal absorption achieved with PCHP-750-0.2 (min. reflection loss of -34.05 dB, bandwidth of 5.08 GHz).
• Synergistic effects of polarization, conductivity, and hollow structure enhanced absorption.
• Demonstrated superior radar cross-section reduction capability.

Conclusions:

• A versatile route for engineering P-doped carbon architectures was developed.
• In-depth understanding of structure-property-performance for electromagnetic wave attenuation was provided.
• PCHPs show significant potential for high-efficiency electromagnetic wave absorption applications.