کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1643246 | 1517244 | 2015 | 4 صفحه PDF | دانلود رایگان |
• Urchin-like ZnO hollow spheres were synthesized by a simple hydrothermal method.
• Microwave absorption properties of urchin-like ZnO hollow spheres were investigated.
• The ZnO calcined at 500 °C exhibited dual peaks with increasing thickness.
• The ZnO calcined at 500 °C exhibited better absorption properties than others.
Urchin-like ZnO hollow spheres were synthesized by a simple hydrothermal method and their electromagnetic and microwave absorbing properties were investigated. The enlarged SEM image shows that as-prepared ZnO precursor is composed of randomly close-packed porous nanosheets. On the contrary, well-crystallized ZnO spheres are obtained after calcination. The TEM images provide further insight into the detailed structure, showing the typically urchin-like and hollow morphology of ZnO calcined at 500 °C. The SAED pattern clearly demonstrates the single-crystalline feature of urchin-like ZnO hollow spheres. It can be found that the urchin-like ZnO calcined at 500 °C exhibit relatively higher EM wave absorption properties than others. The maximum RL is up to −20 dB at 14.3 GHz and the EM wave absorption shows dual peaks with increasing thickness.
Journal: Materials Letters - Volume 144, 1 April 2015, Pages 157–160