期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 580, 期 -, 页码 126-134出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.07.025
关键词
Microwave absorbents; Porous carbon; Microwave absorption; NaCl crystal template
资金
- Scientific Research Starting Foundation of Shaanxi University of Science and Technology [2017QNBJ-04]
- National Natural Science Foundation of China [51772177, 51702193]
- Science and Technology Foundation of Shaanxi Province [2018JM5010]
Manufacturing highly efficient microwave absorbents with powerful absorbing intensity, wide effective absorption bandwidth (RL < -10 dB, it means that 90% of the electromagnetic waves enter the absorber and are dissipated) and light weight at low filling loading is still a challenge. In this work, N, S-codoped honeycomb-like C/Ni3S2 composites were synthesized via a freeze-drying approach and following pyrolysis process under Ar atmosphere, using NaCI and sucrose as template and carbon source, respectively. When evaluated as a microwave absorbent, the as-obtained N, S-codoped honeycomb-like C/Ni3S2 composite pyrolyzed at 700 degrees C displayed high performance for microwave absorption including high absorption intensity (the maximum reflection loss of -46.8 dB at 13.4 GHz), broad effective absorbing bandwidth (7.0 GHz, 11.0-18.0 GHz) and relative low filling loading in paraffin (only 10 wt%). Such high performance of microwave absorption could be ascribed to the better impedance matching and stronger damping ability induced by unique honeycomb-like structure and suitable pyrolysis temperature. Importantly, our research might provide a facile and engineering strategy to explore other types of microwave absorbing materials to boost their microwave absorption at low filler loading. (C) 2020 Elsevier Inc. All rights reserved.
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