Directed Growth and Microwave Absorption Property of Crossed ZnO Netlike Micro-/Nanostructures

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• 作者：Huifeng Li ; Yunhua Huang ; Genban Sun ; Xiaoqin Yan ; Ya Yang ; Jian Wang ; Yue Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：June 10, 2010
• 年：2010
• 卷：114
• 期：22
• 页码：10088-10091
• 全文大小：250K
• 年卷期：v.114,no.22(June 10, 2010)
• ISSN：1932-7455

文摘

Three-dimensional ZnO micro/nanorod networks were synthesized through the direct evaporation of metal zinc and graphite powders in Ar and O₂ at 910 °C without any catalyst. The micro/nanorod networks of as-synthesized ZnO were characterized by using scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray diffraction. The branches within one network show very regular cross orientation. The nanorods follow a growth direction [0001]. Mircrowave absorption properties of the ZnO netlike structures have been investigated in detail. The reflection loss (RL) of the netlike structures and nanotetrapod-shaped ZnO were calculated by using the relative complex permeability and permittivity. And the value of minimum RL for the composite with 50 vol % ZnO netlike structures is −37 dB at 6.2 GHz with a thickness of 4.0 mm. These results provide a wide insight for the netlike structure ZnO as desirable materials for the fabrication of micro/nanoscale functional electromagnetic shield devices.