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Confining Tiny MoO2 Clusters into Reduced Graphene Oxide for Highly Efficient Low Frequency Microwave Absorption
Cao Wu1,2, Zhaofeng Chen1, Meiling Wang3
1International Laboratory for Insulation and Energy Efficiency Materials, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 11, 2020
Summary
Researchers developed novel dielectric electromagnetic wave absorbents using a cage-confinement pyrolysis strategy. These materials, based on molybdenum dioxide (MoO2) nanoparticles and reduced graphene oxide (RGO), show excellent low-frequency absorption for portable electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Development of efficient electromagnetic wave absorbers is crucial for modern electronics.
- Existing 2D dielectric absorbers often have limitations in low-frequency performance and tunability.
- Molybdenum dioxide (MoO2) and reduced graphene oxide (RGO) are promising components for electromagnetic wave absorption.
Purpose of the Study:
- To propose a supermolecular-scale cage-confinement pyrolysis strategy for fabricating novel dielectric electromagnetic wave absorbents.
- To investigate the electromagnetic wave absorption properties of MoO2/porous carbon/RGO nanocomposites.
- To explore the mechanism behind the enhanced absorption performance.
Main Methods:
- Fabrication of hybrid hydrogels with different crosslinkers (with/without oxygen bridge).
- Supermolecular-scale cage-confinement pyrolysis of hybrid hydrogels to create MoO2 nanoparticles within porous carbon shells and RGO.
- Characterization of the structure and electromagnetic wave absorption properties of the synthesized materials.
Main Results:
- Two types of dielectric electromagnetic wave absorbents were successfully synthesized, featuring MoO2 nanoparticles sandwiched between porous carbon shells and RGO.
- Both absorbents demonstrated excellent low-frequency absorption performance, electrical tunability, and enhanced reflection loss without magnetic components.
- The introduction of oxygen bridges in the crosslinker led to a more stable structure and multifrequency absorption capabilities.
- The enhanced absorption is attributed to moderate attenuation constant and impedance matching.
Conclusions:
- The cage-confinement pyrolysis strategy is effective for creating advanced 2D MoO2-based dielectric electromagnetic wave absorbents.
- These novel absorbents offer superior low-frequency and multifrequency absorption, suitable for portable electronics.
- This work provides a new pathway for designing electromagnetic wave absorbers for diverse frequency applications.
