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首页> 外文期刊>Nanotechnology >Low temperature preparation of highly fluorinated multiwalled carbon nanotubes activated by Fe3O4 to enhance microwave absorbing property
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Low temperature preparation of highly fluorinated multiwalled carbon nanotubes activated by Fe3O4 to enhance microwave absorbing property

机译：低温制备高氟化多壁碳纳米管，由Fe3O4激活，以增强微波吸收性能

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摘要

Conventional approaches to preparing highly fluorinated multiwalled carbon nanotubes (MWCNTs) always require a high temperature. This paper presents a catalytic approach to realizing the effective fluorination of MWNCTs at room temperature (RT). Fe3O4/MWCNTs composites with Fe3O4 loaded on MWCNTs were first prepared using the solvothermal method, followed by fluorination treatment at RT. The attachment of Fe3O4 changes the charge distribution and dramatically improves the fluorination activity of MWCNTs. Consequently, the fluorine content of fluorinated Fe3O4/MWCNTs (F-Fe3O4/MWCNTs) can reach up to 17.13 at% (almost six times that of the unloaded sample) only after fluorination at room temperature, which leads to an obvious decrease in permittivity. Besides, the partial fluorination of Fe3O4 brings about abnormally enhanced permeability due to strengthened exchange resonance. Benefiting from the lower permittivity and higher permeability, F-Fe3O4/CNTs composite exhibits increased impedance matching and thus an enhanced microwave absorption property with a minimal reflection loss of -45 dB at 2.61 mm when the filler content is 13 wt%. The efficient absorption bandwidth (-10 dB) reaches 4.1 GHz when the thickness is 2.5 mm. This work illustrates a novel catalytic approach to preparing highly fluorinated MWCNTs as promising microwave absorbers, and the design concept can also be extended to the fluorination of other carbon materials.
机译：常规方法制备高度氟化多壁碳纳米管（MWCNT）总是需要一个高的温度。本文介绍了一种催化方法，在室温（RT）实现MWNCTs的有效氟化。四氧化三铁/ Fe3O4的与多壁碳纳米管的复合材料装载在使用溶剂热法，然后在室温下氟化处理首先制备多壁碳纳米管。四氧化三铁的连接改变的电荷分布和显着地改善多壁碳纳米管的氟化活性。因此，氟化的Fe3O4 /多壁碳纳米管中的氟含量（F-Fe3O4的/多壁碳纳米管）可在％可达17.13只在室温下氟化后（近六该卸载样品的时间），这导致介电常数明显降低。此外，四氧化三铁的部分氟化带来异常增强渗透性由于加强交流谐振。从较低的介电常数和较高的渗透性受益，F-Fe3O4的/碳纳米管复合物表现出增加的阻抗的匹配，从而增强的微波吸收特性具有-45 dB的最小反射损耗在2.61毫米当填料的含量为13重量％。高效吸收带宽（小于-10分贝）达到4.1千兆赫时的厚度为2.5mm。这项工作示出了新型催化方法制备高度氟化多壁碳纳米管作为有希望的微波吸收剂，和设计概念也可以延伸到其它碳材料的氟化。

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  • 来源
    《Nanotechnology》 |2018年第36期|共13页
  • 作者

    Liu Yang; Zhang Yichun; Zhang Cheng; Huang Benyuan; Li Yulong; Lai Wenchuan; Wang Xu; Liu Xiangyang;

  • 作者单位

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Coll Polymer Sci &

    Engn State Key Lab Polymer Mat &

    Engn Chengdu 610065 Sichuan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    low temperature; catalysis; fluorination; MWCNTs; microwave absorption; impedance matching;

    机译：低温;催化;氟化;MWCNT;微波吸收;阻抗匹配;

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