51. Facile synthesis of hierarchical chrysanthemum-like copper cobaltate-copper oxide composites for enhanced microwave absorption performance
- Author
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Ruisheng Yang, Yuancheng Fan, Shuang Chen, Ming Qin, Hongjing Wu, Fuli Zhang, Di Lan, and Quanhong Fu
- Subjects
Diffraction ,Thermogravimetric analysis ,Copper oxide ,Materials science ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,law.invention ,Biomaterials ,symbols.namesake ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,law ,0103 physical sciences ,Calcination ,Composite material ,010302 applied physics ,Spinel ,021001 nanoscience & nanotechnology ,Copper ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry ,engineering ,symbols ,0210 nano-technology ,Raman spectroscopy ,Microwave - Abstract
Hierarchical chrysanthemum-like CuCo2O4-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 (Cu0 + 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°). We believe that the hierarchical chrysanthemum-like CuCo2O4-CuO composites can be a good candidate for the high-performance Co-based spinel microwave absorbers.
- Published
- 2018