Hollow Tubular Cobalt/Carbon Composite Absorber

Broadband absorption plus thermal insulation

A hollow tubular composite derived from ZIF-67 with cobalt nanoparticles embedded in a nitrogen-doped carbon shell, achieving broadband microwave absorption at thin thickness via synergistic loss mechanisms, along with thermal insulation and infrared stealth.

Zhicheng, Lu · Du, Wei · Xie, Xiubo · Xinle, Sun · Yang, Xiaoyang · Fushan, Li · Zhang, Yuping · Yang, Zuo · Xu, Chen · Hou, Chuanxin · Jiang, Huiyu

Carbon 2026

Specifications

Effective absorption bandwidth

{'zh': '6.72', 'en': '6.72'} GHz

Minimum reflection loss

{'zh': '-53.98', 'en': '-53.98'} dB

Advantages

Broad bandwidth

The hollow tubular structure induces multiple reflections and scattering of incident waves, enabling an effective absorption bandwidth of 6.72 GHz at a thin thickness of 2.2 mm.

Strong absorption

A minimum reflection loss of −53.98 dB at 4.0 mm corresponds to over 99.999% absorption of incident waves.

Multifunctional

The material also exhibits thermal insulation and infrared stealth, ensuring absorption reliability at elevated temperatures and expanding application scenarios.

Feasible synthesis

The hollow tubular structure is synthesized via a MOF self-sacrificing template method, which is simple and controllable, facilitating scale-up.

Applications

• EMW absorbing materials：Broadband strong absorption for various EM environments.
• Radar stealth coatings：Thin-layer broadband absorption reduces radar cross-section.
• Electromagnetic shielding：Efficiently absorbs EM waves, reducing reflected pollution.
• Thermal management for electronics：Thermal insulation complements other functions.