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Constructing ordered macropores in hollow Co/C polyhedral nanocages shell toward superior microwave absorbing
Lei Wang1, Shuheng Zhu1, JianFeng Zhu1
1Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Journal of Colloid and Interface Science
|June 6, 2022
Summary
This study introduces hollow porous cobalt/carbon (Co/C) nanocages for advanced microwave absorption. These novel materials exhibit excellent electromagnetic wave attenuation and broadband absorption capabilities.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Rational design of porous carbon architectures is crucial for effective microwave absorption.
- Developing lightweight and high-performance microwave absorbers is an ongoing challenge.
Purpose of the Study:
- To synthesize and characterize novel hollow porous Co/C polyhedral nanocages (HP-Co/C) for microwave absorption.
- To investigate the relationship between porous structure and electromagnetic wave absorption performance.
Main Methods:
- Epitaxial growth of ZIF-67/SiO2 nanolayers on ZIF-8 nanoparticles.
- Calcination in Argon atmosphere followed by SiO2 removal using HF.
- Characterization of morphology, structure, and electromagnetic properties.
Main Results:
- HP-Co/C nanocages with ordered macropores (∼60 nm) were successfully synthesized.
- The material demonstrated strong electromagnetic wave attenuation and excellent impedance matching.
- A reflection loss of -66.5 dB and an effective absorption bandwidth of 8.96 GHz were achieved at 15 wt% filler.
Conclusions:
- The ordered macropores in HP-Co/C effectively tune electromagnetic parameters for superior microwave absorption.
- This study presents a new design strategy for lightweight, broadband microwave absorbers.
- The findings enrich the field of efficient microwave absorbing materials.
