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Selective synthesis and shape-dependent microwave electromagnetic properties of polymorphous ZnO complex architectures

Published online by Cambridge University Press:  04 March 2014

Fangfang Du ,
Guoxiu Tong ,
Chaoli Tong ,
Yun Liu  and
Jianqing Tao
Fangfang Du*
Affiliation:
Chemical Department, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
Guoxiu Tong*
Affiliation:
Chemical Department, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
Chaoli Tong*
Affiliation:
Chemical Department, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
Yun Liu
Affiliation:
Chemical Department, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
Jianqing Tao*
Affiliation:
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, People's Republic of China
*
a) Address all correspondence to these authors. e-mail: tonggx@zjnu.cn
b) e-mail: taojq@whut.edu.cn
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Abstract

A simple one-pot hydrothermal approach that allowed the selective synthesis of complex ZnO architectures with varying configurations without using any surfactants and/or solid templates is proposed in this paper. The ZnO configurations include spherical aggregates, nanosheet-based flowers, microrod-composed flowers, and nanopetal-built flowers. Kinetic factors (i.e., the base type and base/Zn2+ molar ratio) can be easily utilized to control the oriented attachment and growth of [Zn(OH)]2− on the (001) polar planes, thereby regulating the morphology of ZnO architectures. The ZnO architectures were characterized by scanning electron microscopy, transmission electron microscopy, selected-area electron diffraction, x-ray diffraction, and specific surface area. The relationships between the structures and microwave electromagnetic properties were established. Enhanced dielectric and absorption properties were exhibited by ZnO flowers composed of large-aspect-ratio microrods. Such properties could be attributed to the improved microcurrent attenuation and interface scattering rather than the dielectric relaxation and microantenna radiation. This study provides a guide for creating and synthesizing highly efficient microwave absorbing materials.

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Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 5 , 14 March 2014 , pp. 649 - 656
Copyright
Copyright © Materials Research Society 2014 

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