期刊
CRYSTENGCOMM
卷 15, 期 7, 页码 1314-1323出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce26757h
关键词
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资金
- National Natural Scientific Foundation of China [51102215]
- Natural Science Foundation of Zhejiang Province [Y4100022]
- Key Innovative Team of Magnetic Materials in Zhejiang Province [2011R09006-06]
- Science and Technology Projects from Jinhua City [2010A12066]
- New Bud Talents Grant from Zhejiang Province
The current study describes a facile one-step ethanediamine (en)-assisted hydrothermal approach for the selective synthesis of ZnO architectures with morphologies that evolve from nanocones, to twinned nanoroses, to dispersed microneedles, and even to complex, flower-shaped architectures. Kinetic factors, such as time, temperature, en-to-Zn(NO3)(2) molar ratio (delta), [Zn2+],and Zn sources can be easily utilized to control the oriented attachment growth of [Zn(OH)(4)](2-) on the (0001) polar surface, thereby regulating the morphology and growth direction of the ZnO architectures. Time lengthening as well as increases in temperature, delta, and [Zn2+] can promote the morphological evolution from needle-like to flower-shaped and can change the structurally oriented growth from along the c-axis to along the a-axis. The flower-shaped ZnO-wax composites exhibit enhanced permittivity and microwave-absorbing properties as mass fraction increases. However, this distinct morphology is prone to high dielectric loss. Thus, the flower-shaped ZnO showed stronger microwave absorption performances than the needle-like ZnO, with a minimum reflection loss (R-L) of -21.85 dB at 8.4 GHz, corresponding to a matching thickness of 3.0 mm. In particular, interesting nesting microwave absorption peaks can be observed in the reflection loss plots of the flower-shaped ZnO. The current work provides insights into the absorption mechanism of flower-shaped ZnO absorption materials.
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