Facile synthesis of hierarchical chrysanthemum-like copper cobaltate-copper oxide composites for enhanced microwave absorption performance.

Author(s) Lan, D.; Qin, M.; Yang, R.; Chen, S.; Wu, H.; Fan, Y.; Fu, Q.; Zhang, F.
Journal J Colloid Interface Sci
Date Published 2019 Jan 01
Abstract

Hierarchical chrysanthemum-like CuCoO-CuO composites were successfully synthesized by a facile one-pot hydrothermal method after calcination at 500 °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 + CuO + CoO → CuO + CuCoO) of the samples could be tuned by the calcination temperature. The existed interfaces of CuCoO-CuCoO, CuCoO-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 CuCoO-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°). We believe that the hierarchical chrysanthemum-like CuCoO-CuO composites can be a good candidate for the high-performance Co-based spinel microwave absorbers.

DOI 10.1016/j.jcis.2018.08.108
ISSN 1095-7103
Citation Lan D, Qin M, Yang R, Chen S, Wu H, Fan Y, et al. Facile synthesis of hierarchical chrysanthemum-like copper cobaltate-copper oxide composites for enhanced microwave absorption performance. J Colloid Interface Sci. 2019;533:481-491.

Related Applications, Forms & Industries