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Multifunctional MoCx Hybrid Polyimide Aerogel with Modified Porous Defect Engineering for Highly Efficient
Tong Liu1,2, Yanan Zhang1, Chong Wang1
1Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China.
Small (Weinheim an Der Bergstrasse, Germany)
|March 7, 2024
Summary
This study introduces a novel multifunctional microwave absorber by embedding polyoxometalates (POMs) into Co-MOFs. The resulting material demonstrates excellent electromagnetic wave absorption and desirable properties like nonflammability.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Traditional electromagnetic wave absorbing materials (EWAMs) often lack multifunctionality, limiting their performance in diverse applications.
- Integrating EWAMs into multifunctional components is crucial for enhanced absorption and performance retention.
- Developing advanced materials with synergistic dielectric and magnetic properties is key for next-generation absorbers.
Purpose of the Study:
- To design and synthesize a novel 3d/4d-bimetallic based crystalline precursor for multifunctional microwave absorbers.
- To investigate the electromagnetic wave absorption properties and multifunctional characteristics of the developed material.
- To explore the synergistic effects of dielectric and magnetic components for enhanced performance.
Main Methods:
- Polyoxometalates (POMs) were embedded within Cobalt Metal-Organic Frameworks (Co-MOFs).
- The composite precursor was pyrolyzed to form metallic Co and MoCx hetero-units within a carbon matrix.
- Electromagnetic wave absorption, bandwidth, and material properties (robustness, nonflammability, thermal insulation, self-cleaning) were evaluated.
Main Results:
- The pyrolyzed material (η-MoC/Co@NC-800) exhibited a minimum reflection loss (RLmin) of -47.72 dB at 11.76 GHz with a thickness of 2.0 mm.
- An effective absorption bandwidth (EAB) of 4.58 GHz covering the entire X-band was achieved at a thickness of 2.5 mm.
- The resulting MoCx hybrid polyimide (MCP) aerogel showed structural robustness, nonflammability, and excellent thermal insulation.
Conclusions:
- The developed material demonstrates superior electromagnetic wave absorption capabilities due to synergistic polarization, magnetic loss, and impedance matching.
- The multifunctional aerogel possesses desirable properties suitable for practical applications, comparable to commercial products.
- This work provides a strategic approach for designing advanced, multipurpose microwave absorbers with complex structures.
