期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 533, 期 -, 页码 481-491出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.08.108
关键词
Chrysanthemum-like; CuCo2O4-CuO composites; Microwave absorption; Interfacial polarization
资金
- National Science Foundation of China [21806129, 51872238, 61771402, 61505164, 11674266, 11372248, 51575297]
- Science and Technology Plan of Shenzhen City [JCYJ20170817162221169]
- Fundamental Research Funds for the Central Universities [3102018zy045]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ5116, 2017JM6094]
Hierarchical chrysanthemum-like CuCo2O4-CuO composites were successfully synthesized by a facile one-pot hydrothermal method after calcination at 500 degrees C. Based on the results of X-ray diffraction (XRD), Raman spectra, thermogravimetric analysis (TGA) and transmission electron microscope (TEM), we found that not only the morphology (from 2 dimensional to 3 dimensional) but also the crystalline structure (Cu-0 + Cu2O + CoOx -> CuO + CuCo2O4) of the samples could be tuned by the calcination temperature. The existed interfaces of CuCo2O4-CuCo2O4, CuCo2O4-CuO, and CuO-CuO played a key role on the attenuation of electromagnetic waves. The effective absorption frequency bandwidth is up to 4.02 GHz with a matched thickness of 2.8 mm. The CuCo2O4-CuO/paraffin composites can even exhibit bigger effective frequency bandwidth (from 4.02 to 4.65 GHz) if we turn the incident angle of electromagnetic (EM) wave to a proper value (i.e., 45 degrees). We believe that the hierarchical chrysanthemum-like CuCo2O4-CuO composites can be a good candidate for the high-performance Co-based spinel microwave absorbers. (C) 2018 Elsevier Inc. All rights reserved.
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