High-frequency properties of oil-phase-synthesized ZnO nanoparticles

High-frequency properties of oil-phase-synthesized ZnO nanoparticles
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油相合成ZnO纳米粒子的高频特性

DOI:
10.1088/1674-1056/24/2/027804
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发表时间:
2015-02
期刊:
影响因子:
1.7
通讯作者:
Zhao Guo-Ping
Zhao Guo-Ping
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Shen Jun;Zhang Xiang-Qun;Cheng Zhao-Hua;Zhao Guo-Ping

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采用高温有机相法制备了具有六方纤锌矿结构的单分散纳米氧化锌。纳米氧化锌的紫外可见吸收峰由体相氧化锌的385 nm蓝移至369 nm。在0.1 GHz~10 GHz范围内,纳米氧化锌复介电常数的实部和影部均呈线性下降,未出现明显的共振峰。在0.1 GHz和10 GHz下,纳米氧化锌的本征介电常数实部分别约为5.7和5.0,并表现出明显的尺寸效应。不同重量比的氧化锌纳米粒子的介电损耗角正切值(tanδ)随频率的增加呈现不同的下降规律。
Monodispersive ZnO nanoparticles each with a hexagonal wurtzite structure are facilely prepared by the high-temperature organic phase method. The UV-visible absorption peak of ZnO nanoparticles presents an obvious blue-shift from 385 nm of bulk ZnO to 369 nm. Both the real part and the image part of the complex permittivity of ZnO nanoparticles from 0.1 GHz to 10 GHz linearly decrease without obvious resonance peak appearing. The real parts of intrinsic permittivity of ZnO nanoparticles are about 5.7 and 5.0 at 0.1 GHz and 10 GHz respectively, and show an obvious size-dependent behavior. The dielectric loss angle tangent (tanδ) of ZnO nanoparticles with a different weight ratio shows a different decreasing law with the increase of frequency.
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