Co2+/Co3+ ratio dependence of electromagnetic wave absorption in hierarchical NiCo2O4-CoNiO2 hybrids

被引:429
作者
Wu, Hongjing [1 ,2 ]
Wu, Guanglei [1 ,3 ]
Ren, Yanyan [1 ]
Yang, Le [1 ]
Wang, Liuding [1 ]
Li, Xinghua [4 ]
机构
[1] Northwestern Polytech Univ, Dept Appl Phys, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Sch Sci, NPU UM Joint Lab Soft Matter 2, Xian 710072, Peoples R China
[3] Xi An Jiao Tong Univ, CNRE, State Key Lab Elect Insulat & Power Equipment, Sch Elect Engn, Xian 710049, Peoples R China
[4] NW Univ Xian, Sch Phys, Xian 710069, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
MICROWAVE-ABSORBING PROPERTIES; RAMAN-SCATTERING; FACILE SYNTHESIS; HOLLOW SPHERES; GRAPHENE; CARBON; SURFACE; NANOCOMPOSITES; NANOCRYSTALS; COMPOSITES;
D O I
10.1039/c5tc01716e
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Amorphous hierarchical NiCo2O4-CoNiO2 hybrids have been successfully fabricated via a facile one-pot hydrothermal route, followed by morphological conversion into urchin-like structured NiCo2O4-CoNiO2 nanorods and irregular-shaped hierarchical NiCo2O4-CoNiO2 polyhedral nanocrystals through air-annealing treatment at 450 degrees C and 650 degrees C, respectively. The phase structure, morphology and chemical composition have been characterized in detail. Calcined hierarchical NiCo2O4-CoNiO2 hybrids show improved microwave absorption properties, which are ascribed to the synergistic effect of dielectric CoNiO2 and NiCo2O4 phases. In particular, the calcined hierarchical NiCo2O4-CoNiO2 hybrids at 450 degrees C exhibit significant enhancement in complex permittivity with respect to others due to their remarkable dipole polarization and interfacial polarization. The maximum reflection loss (RL) of the calcined hierarchical NiCo2O4-CoNiO2 hybrids at 450 degrees C reaches -42.13 dB at 11.84 GHz with a matching thickness of 1.55 mm, and a relatively broad absorption bandwidth (RL <= 10 dB) in the 13.12-17.04 GHz range. Very interestingly, the electromagnetic (EM) wave absorption performance of the hierarchical NiCo2O4-CoNiO2 hybrids shows dependence on the Co2+/Co3+ ratio. The calcined NiCo2O4-CoNiO2 hybrids at 450 degrees C of the most defect concentration possess the best EM wave absorption ability among all the samples. The results suggest that appropriate interactions between the building blocks in hybrids can guide us to design and fabricate highly efficient EM wave absorption materials.
引用
收藏
页码:7677 / 7690
页数:14
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