Superblack Carbon Hierarchitectures for Multispectral Absorption

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Multispectral absorbers are crucial for applications like space exploration, stealth, and camouflage.
• Achieving efficient absorption across visible, infrared, and microwave wavelengths is challenging due to the vast range of incident wavelengths.

Purpose of the Study:

• To design and develop novel superblack carbon hierarchitectures (SCHs) for efficient multispectral wave absorption.
• To investigate the synergistic effects of morphology and dielectric properties on absorption performance.
• To elucidate the geometrical effects influencing microwave absorption mechanisms.

Main Methods:

• A bottom-up approach using self-assembly and self-sacrifice of hydrogen-bonded organic frameworks (HOFs).
• Synergistic morphological customization and dielectric property tuning (via carbon nitride-like moieties and C═C chains).
• Analysis of topological transformations to understand geometrical effects on absorption.

Main Results:

• Superblack carbon hierarchitectures (SCHs) achieved >99.6% visible light absorption.
• High infrared absorption (98.5%-99.6%) across long-, mid-, and short-wavelength infrared regimes.
• Ultrabroad microwave absorption with an 8.52 GHz effective bandwidth, covering X and K_u bands.

Conclusions:

• The developed SCHs offer simultaneous, efficient absorption across visible, infrared, and microwave spectra.
• The study provides insights into the geometrical effects (fractal dimension, interconnection) on microwave absorption.
• This work presents a new paradigm for multispectral absorption materials and mechanisms.