Synthesis and microwave absorption properties of coiled carbon nanotubes/CoFe₂O₄ composites

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• 作者：Jiantao Feng ; Yechen Wang ; Yanhui Hou ; Juanbi Li ; Liangchao Li ; ^{sky52@zjnu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CCNTs ; CoFe2O4 ; Electrical and magnetic properties ; Microwave absorption
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：42
• 期：15
• 页码：17814-17821
• 全文大小：1343 K

文摘

Coiled carbon nanotubes (CCNTs) were coated by CoFe₂O₄ (CFO) nanoparticles to form the CCNTs/CFO composites. The phase composition, morphology, electrical and magnetic performances of the composites were characterized by means of modern analytical techniques. The results indicated that the conductivity and magnetic performances of the samples were related to their compositions. The CCNTs/CFO composite with ω_CCNT/ω_CFO of 0.4 exhibited the best microwave absorption property in the prepared samples, whose minimum reflection loss was about −14 dB in the frequency range of 2–18 GHz for a layer of 2.5–3.0 mm thickness, and the available bandwidth corresponding to RL less than −10 dB can reach 4.0 GHz. Hence, the obtained composite could be used as a new candidate for selective frequency shielding and lightweight microwave absorbing material.