锂锌铁氧体微纳米纤维的电纺制备及吸波性能

doi:10.7503/cjcu20160846

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (6): 922.doi: 10.7503/cjcu20160846

• 中国第四届静电纺丝大会专题研究论文 • 上一篇下一篇

锂锌铁氧体微纳米纤维的电纺制备及吸波性能

赵芳(), 王建江, 许宝才, 刘嘉玮, 高海涛

军械工程学院先进材料研究所, 石家庄 050003

收稿日期:2016-11-28 出版日期:2017-06-10 发布日期:2017-05-23
作者简介:联系人简介: 赵芳, 女, 讲师, 主要从事微纳米功能陶瓷方面的研究. E-mail: zhaofang19821106@163.com
基金资助:
河北省自然科学基金(批准号: E2015506011)资助.

Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers

ZHAO Fang^*(), WANG Jianjiang, XU Baocai, LIU Jiawei, GAO Haitao

Advanced Material Institute, Mechanical Engineering College, Shijiazhuang 050003, China

Received:2016-11-28 Online:2017-06-10 Published:2017-05-23
Contact: ZHAO Fang E-mail:zhaofang19821106@163.com
Supported by:
This paper is supported by the Natural Science Foundation of Hebei Province, China(No.E2015506011).

摘要/Abstract

摘要：

采用静电纺丝技术结合后续热处理制备了尖晶石型Li_0.35Zn_0.3Fe_2.35O₄微纳米纤维. 利用差示扫描量热(DSC)-热重分析(TGA)、傅里叶变换红外光谱(FTIR)、 X射线衍射(XRD)和场发射扫描电子显微镜(FESEM)等手段研究了煅烧温度(700, 800, 900, 1000 ℃)对产物物相和形貌的影响; 利用矢量网络分析仪分析了纤维状产物的吸波性能. 研究结果表明, Li_0.35Zn_0.3Fe_2.35O₄在700 ℃及以上温度煅烧后可生成单一尖晶石结构. 随着煅烧温度的升高, 产物依次呈现出微纳米纤维状、三维网络状、竹节状和颗粒状的微观形貌. 随着匹配厚度增加, 微纳米纤维状Li_0.35Zn_0.3Fe_2.35O₄的最低反射率向低频移动, 在8 GHz以下的最佳匹配厚度为6 mm, 在此厚度下吸波性能优良, 最低反射率为-26 dB, 对应的吸收频率为5.0 GHz, 低于-10 dB的吸收频带为4.0~8.0 GHz, 带宽为4 GHz.

关键词: Li_0.35Zn_0.3Fe_2.35O₄, 煅烧温度, 形貌, 微/纳米纤维, 吸波性能

Abstract:

Spinel-type Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers were prepared through electrospinning and calcination technique. The crystalline phase and micromorphology of the samples calcined at various temperatures(700, 800, 900 and 1000 ℃) for 2 h in air were examined by differential scanning calorimetry(DSC)-thermalgravimetric analysis(TGA), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM). Microwave absorption properties of Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers were determined with a vector network analyzer. The results showed that pure spinel structure formed at 700 ℃ and above. As the temperature increased, Li_0.35Zn_0.3Fe_2.35O₄ exhibited micro/nanofibrous, 3D network, bamboo-like or granular morphology. The minimum reflectivity of Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers at 700 ℃ moved to a low frequency as the matching thickness increased. The matching thickness of Li_0.35Zn_0.3Fe_2.35O₄ micro/nanofibers was 6 mm below 8 GHz, at which the microwave absorption properties were fine. The minimum reflectivity could reach -26 dB at 5.0 GHz, and the frequency band with reflectivity less than -10 dB was 4.0—8.0 GHz.

Key words: Li_0.35Zn_0.3Fe_2.35O₄, Calcination temperature, Morphology, Micro/nanofibers, Microwave absorption property

中图分类号:

O614

TrendMD:

赵芳, 王建江, 许宝才, 刘嘉玮, 高海涛. 锂锌铁氧体微纳米纤维的电纺制备及吸波性能. 高等学校化学学报, 2017, 38(6): 922.

ZHAO Fang, WANG Jianjiang, XU Baocai, LIU Jiawei, GAO Haitao. Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers. Chem. J. Chinese Universities, 2017, 38(6): 922.

图/表 7

Fig.1 DSC-TGA curves of Li0.35Zn0.3Fe2.35O4/PVP composite fibers

Fig.2 XRD patterns of Li0.35Zn0.3Fe2.35O4 calcined at different temperatures a. No calcination; b—d. calcined at 700, 800, 900 and 1000 ℃, respectively.

Fig.3 FTIR spectrum of Li0.35Zn0.3Fe2.35O4 micro/nanofibers calcined at 700 ℃

Fig.4 FESEM image of Li0.35Zn0.3Fe2.35O4/PVP composite fibers

Fig.5 FESEM images of Li0.35Zn0.3Fe2.35O4 calcined at 700 ℃(A), 800 ℃(B), 900 ℃(C) and 1000 ℃(D)

Fig.6 Permittivity(A) and permeability(B) of Li0.35Zn0.3Fe2.35O4 micro/nanofibers

Fig.7 Reflectivity of Li0.35Zn0.3Fe2.35O4 micro/nanofibers at different thicknesses Thickness/mm: a. 4; b. 5; c. 6; d. 7.

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锂锌铁氧体微纳米纤维的电纺制备及吸波性能

Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers

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