期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 24, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202201129
关键词
bimetallic organic frameworks; electromagnetic wave absorber; multi-band absorption; self-polarization
类别
资金
- National Natural Science Foundation of China [51725101, 11727807, 51672050, 61790581, 22088101, 52102368]
- Ministry of Science and Technology of China [2018YFA0209102]
- China Postdoctoral Science Foundation [2020M680085]
- Regional Joint Fund for Basic Research and Applied Basic Research of Guangdong Province [2020SA001515110905]
- Science and Technology Department of Jiangsu Province of China [BK20210261]
This study demonstrates the use of bi-metallic organic frameworks as electromagnetic wave absorbers, achieving broad frequency band and strong absorption capabilities. The rational selection of materials and structure manipulation enhance the performance of electromagnetic wave absorption. This work opens up new possibilities for the development of broadband and strong electromagnetic wave absorbers.
Multiple relaxation behaviors are promising for broad frequency band and strong electromagnetic wave (EMW) absorption based on polarization-controlled electromagnetic (EM) attenuation. However, rational selection of materials and structure manipulation through tunable substitution or phase control are challenging toward optimization of EMW absorption. Herein, bi-metallic organic frameworks (B-MOFs) with various morphologies are employed as EMW absorbers. Remarkably, the polar units can be enhanced by introducing Ni-metal nodes into the Cu-coordinated MOFs, rendering the B-MOFs with self-polarized properties and consecutive multifrequency EMW absorption behaviors. The maximum reflection loss of acetylene black (ACET) filled NiCu-MOFs can reach -40.54 dB together with a wide bandwidth (<-10 dB) of 5.87 GHz at a thickness of 2.5 mm. As a counterpart of the Ni/Cu/C derivatives, significantly increased broad band absorption (6.93 GHz) and multifrequency absorbing and polarization characteristics are also maintained in bimetal coexisting carbonized architectures as prepared by calcination of CuNi-MOFs. This work demonstrates that the performance of effective absorbing frequency band can be enhanced in multi-metallic organic frameworks-based architectures, and paves a novel avenue for developing broadband and strong EMW absorbers.
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