期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 114, 期 -, 页码 206-214出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2021.11.021
关键词
Zeolitic imidazolate framework; Electromagnetic wave absorption; Yolk-shell structure; Hollow structure; Lightweight materials
资金
- National Natural Science Foundation of China [21875190]
- National Science Fund for Distinguished Young Scholars [52025034]
- Analytical & Testing Center of NPU
This work presents a convenient method for preparing zeolitic imidazolate framework-8 (ZIF-8) with yolk-shell and hollow structures. The subsequent pyrolysis of ZIF-8 produces ZnO/nitrogen-doped carbon nanocomplexes with original ZIF-8 morphology. The hollow structure exhibits excellent electromagnetic wave absorption capacity and has a low content.
In this work, zeolitic imidazolate framework-8 (ZIF-8) with yolk-shell and hollow structures were prepared by a convenient chemical etching method. A subsequent pyrolysis of ZIF-8 enabled one to produce ZnO/nitrogen-doped carbon nanocomplexes with original ZIF-8 morphology, where hollow structure showed superior electromagnetic wave absorption capacity and was responsible for matching the impedance of free space. The minimum reflection coefficients of hollow ZnO/nitrogen-doped carbon nanocomplexes were -51.2 dB (700 degrees C) and -52.4 dB (800 degrees C), respectively, whereas the effective absorption band width was as large as 4 GHz and the content of pyrolyzed hollow ZIF-8 was 15 wt%, which was inferior to the level among similar electromagnetic wave (EMW) absorption materials. The convenient and facile strategy paves the way toward designing hierarchical structures for highly efficient and light-weight electromagnetic wave absorbers. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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