Back to Search
Start Over
Multi-dimensional ZnO@MWCNTs assembly derived from MOF-5 heterojunction as highly efficient microwave absorber
- Source :
- Carbon. 172:15-25
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Metal-organic framework (MOF) derivatives have been arousing great attention in microwave absorption (MA) applications because of the adaptable morphological and component variance. However, it is still a huge challenge to construct multi-dimensional assembly with special heterostructure based on MOF and conductive carbon materials for excellent MA performance. Here, we successfully synthesized the cube-like assembly of multi-walled carbon nanotubes (MWCNTs) and ZnO (ZnO@MWCNTs) with unique multi-dimensional architecture via controlling the pyrolysis time of MOF-5 wrapped by MWCNTs. The ZnO@MWCNTs-4h are composed of zero-dimensional ZnO nanoparticles, one-dimensional MWCNTs, and three-dimensional micro-scale porous carbon framework. These various dimensional components confined within the cube space lead to the strong reflection loss (RL) at different frequencies, thus resulting in exceptional MA performance. The ZnO@MWCNTs-4h can reach a RL peak of −34.4 dB at only 1.5 mm thickness. More importantly, the maximum RL can achieve −47.4 dB at 2.7 mm with a mass loading as low as 20%. The optimized MA performance can be ascribed to high-density polarized sites, tightly interwoven MWCNTs conductive network, and strong multiple scattering that all induced by the multi-dimensional structures and components. Therefore, novel ZnO@MWCNTs composites are promising as a lightweight and highly efficient microwave absorber.
- Subjects :
- Materials science
Scattering
business.industry
Reflection loss
chemistry.chemical_element
Heterojunction
02 engineering and technology
General Chemistry
Carbon nanotube
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
chemistry
law
Optoelectronics
General Materials Science
0210 nano-technology
business
Absorption (electromagnetic radiation)
Carbon
Electrical conductor
Microwave
Subjects
Details
- ISSN :
- 00086223
- Volume :
- 172
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi...........68111707920d2bf18c8e26ccb386aca1