TY - JOUR
T1 - Tailoring Self-Polarization of Bimetallic Organic Frameworks with Multiple Polar Units Toward High-Performance Consecutive Multi-Band Electromagnetic Wave Absorption at Gigahertz
AU - Cheng, Junye
AU - Zhang, Huibin
AU - Wang, Honghan
AU - Huang, Zehao
AU - Raza, Hassan
AU - Hou, Chuanxu
AU - Zheng, Guangping
AU - Zhang, Deqing
AU - Zheng, Qingbin
AU - Che, Renchao
N1 - Funding Information:
J.C., H.Z., and H.W. contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (Grant No. 51725101, 11727807, 51672050, 61790581, 22088101, 52102368), the Ministry of Science and Technology of China (973 Project No. 2018YFA0209102), China Postdoctoral Science Foundation (Grant No. 2020M680085), Regional Joint Fund for Basic Research and Applied Basic Research of Guangdong Province (No. 2020SA001515110905), and Science and Technology Department of Jiangsu Province of China (Grant No. BK20210261).
Publisher Copyright:
© 2022 Wiley-VCH GmbH
PY - 2022/6/10
Y1 - 2022/6/10
N2 - 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.
AB - 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.
KW - bimetallic organic frameworks
KW - electromagnetic wave absorber
KW - multi-band absorption
KW - self-polarization
UR - http://www.scopus.com/inward/record.url?scp=85126037328&partnerID=8YFLogxK
U2 - 10.1002/adfm.202201129
DO - 10.1002/adfm.202201129
M3 - Journal article
AN - SCOPUS:85126037328
SN - 1616-301X
VL - 32
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 24
M1 - 2201129
ER -