Journal
MATERIALS CHARACTERIZATION
Volume 97, Issue -, Pages 18-26Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2014.08.019
Keywords
C@Ni-NiO core-shell hybrid solid sphere; Multi-shelled NiO hollow sphere; SEM; TEM; EM wave absorption
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Funding
- Nature Science Foundation of China [50771082, 60776822]
- Excellent Doctorate Foundation, Doctorate Foundation of Northwestern Polytechnical University [CX201207]
- Ministry of Education of the People's Republic of China
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We reported the preparation of C@Ni-NiO core-shell hybrid solid spheres or multi-shelled NiO hollow spheres by combining a facile hydrothermal route with a calcination process in H-2 or air atmosphere, respectively. The synthesized C@Ni-NiO core-shell solid spheres with diameters of approximately 2-6 mu m were in fact built from dense NiO nanoparticles coated by random two-dimensional metal Ni nanosheets without any visible pores. The multi-shelled NiO hollow spheres were built from particle-like ligaments and there are a lot of pores with size of several nanometers on the surface. Combined Raman spectra with X-ray photoelectron spectra (XPS), it suggested that the defects in the samples play a limited role in the dielectric loss. Compared with the other samples, the permeability of the samples calcined in H-2 and air was increased slightly and the natural resonance frequency shifted to higher frequency (7,11 and 14 GHz, respectively), leading to an enhancement of microwave absorption property. For the sample calcined in H-2, an optimal reflection loss less than 10 was obtained at 7 GHz with a matching thickness of 5.0 mm. Our study demonstrated the potential application of C@Ni-NiO core-shell hybrid solid sphere or multi-shelled NiO hollow sphere as a more efficient electromagnetic (EM) wave absorber. (C) 2014 Elsevier Inc. All rights reserved.
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