journal article·2023-07-11

Conductive Metal–Organic Frameworks with Tunable Dielectric Properties for Boosting Electromagnetic Wave Absorption

Xue Zhang, Xue-Lei Tian, Yutian Qin, Jing Qiao, Fei Pan, Na Wu, Changxian Wang, Shanyu Zhao, Wei Liu, Jie Cui, Zhao Qian, Meiting Zhao, Jiurong Liu, Zhihui Zeng

ACS Nano· Volume 17· Issue 13
Publisher page

Abstract

Metal–organic frameworks (MOFs) manifest enormous potential in promoting electromagnetic wave (EMW) absorption thanks to the tailored components, topological structure, and high porosity. Herein, rodlike conductive MOFs (cMOFs) composed of adjustable metal ions of Zn, Cu, Co, or Ni and ligands of hexahydroxytriphenylene (HHTP) are prepared to attain tunable dielectric properties for a tailored EMW absorption. Specifically, the influences of the cMOFs’ composition, charge transport characteristic, topological crystalline structure, and anisotropy microstructure on dielectric and EMW absorption performance are ascertained, advancing the understanding of EMW attenuation mechanisms of MOFs. The boosted conductive and polarization losses derived from the conjugation effects and terminal groups, as well as shape anisotropy, lead to a prominent EMW absorption of the cMOFs. The Cu-HHTP confers a minimum reflection loss (RL min ) of −63.55 dB at the thickness of 2.9 mm and a maximum effective absorption bandwidth of 5.2 GHz. Moreover, Zn-HHTP showcases the absorption superiority in the S-band (2–4 GHz) with an RL min of −62.8 dB at a thickness of 1.9 mm. This work not only hoists the mechanistic understanding of the structure–function relationships for the cMOFs but also offers guidelines for preparing functional MOF materials.
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Research context

OpenAlex topics: Electromagnetic wave absorption materials · MXene and MAX Phase Materials · Advanced Antenna and Metasurface Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory for Liquid−Solid Structural Evolution and Processing of Materials, School of Materials Science and Engineering, Shandong University, Jinan 250061, P. R. China

Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin 300072, P. R. China

School of Mechanical Engineering, Shandong University, Jinan 250061, P. R. China

Department of Chemistry, University of Basel, Basel CH-4058, Switzerland

Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich CH-8093, Switzerland

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

Laboratory for Building Energy Materials and Components, Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf 8600, Switzerland

State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China

Funding

Natural Science Foundation of Tianjin City · National Key Research and Development Program of China · Tianjin University · Shandong University · Postdoctoral Innovation Project of Shandong Province · National Natural Science Foundation of China · Natural Science Foundation of Shandong Province · Key Technology Research and Development Program of Shandong · ?20 Clauses about Colleges and Universities (new)? (Independent Training of Innovation Team) Program · Shenzhen Municipal Special Fund for Guiding Local Scientific and Technological Development

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