Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 34, Pages 17494-17504Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm31790g
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Funding
- National Natural Scientific Foundation of China [51102215]
- Natural Scientific Foundation of Zhejiang Province [Y4100022]
- Key Innovative Team of Magnetic Materials in Zhejiang Province [2011R09006-06]
- Science and Technology Projects from Jinhua City [2010A12066]
- Zhejiang Province
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A facile template-free and one-pot thermal decomposition approach was used for the mass preparation of submicrometer-sized NiO octahedra. Ni octahedra with tailored crystallization and texture characteristics are easily achieved through H-2-annealing of NiO octahedra at various temperatures. The good morphology retention of Ni octahedra is due to the principle of minimum surface free energy as well as the similar crystallographic system to that of NiO. Studies on static magnetic and microwave electromagnetic properties reveal the relationships among the reactivity, shape, and resultant properties of the nanomaterials. Because of their high BET specific surface area and favorable crystal size, porous Ni octahedra produced at 300 degrees C exhibit excellent matching and absorbing properties with a minimum R-L value of -37.93 dB at 12.80 GHz and 11.60 GHz bandwidth (below -20 dB). Thus the Ni octahedra described here are believed to have a wide range of applications, including catalysis, electromagnetic shielding, and absorption.
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