文章信息/Info

Title:

Preparation of Co/Carbon Nanofiber Composites and Study on their Microwave Absorption Properties

文章編號:

1674-3962(2021)06-0432-09

作者:

魏武超; 梁亮亮; 張子強; 劉慶雷

（上海交通大學 金屬基復(fù)合材料國家重點實驗室，上海 200240）

Author(s):

WEI Wuchao; LIANG Liangliang; ZHANG Ziqiang; LIU Qinglei

(The State Key Laboratory of Metal Matrix Composites，Shanghai Jiao Tong University，Shanghai 200240，China)

關(guān)鍵詞:

細菌纖維素; 碳納米纖維; 金屬Co納米粒子; 碳熱還原; 吸波性能

Keywords:

bacterial cellulose;  carbon nanofiber;  Co nanoparticle;  Carbothermal reduction;  microwave absorption

分類號:

TB333

DOI:

10.7502/j.issn.1674-3962.202001010

文獻標志碼:

A

摘要:

現(xiàn)代電子產(chǎn)業(yè)的不斷發(fā)展，對吸波材料提出了“薄、寬、輕、強”的綜合要求。開發(fā)出一種輕質(zhì)高效、制備工藝簡單、成本低廉的新型復(fù)合碳基吸波材料具有重要的理論意義和應(yīng)用價值。以來源豐富的可再生資源——細菌纖維素（BC）為碳源，利用其表面豐富的含氧官能團吸附Co2+，再經(jīng)冷凍干燥與一步碳熱還原制備出鈷/碳納米纖維復(fù)合材料。通過場發(fā)射掃描電子顯微鏡（FE-SEM）、透射電子顯微鏡（TEM）、Ｘ射線衍射儀（XRD）、拉曼光譜儀（Raman）、X射線光電子能譜儀（XPS）、振動樣品磁強計（VSM）和矢量網(wǎng)絡(luò)分析儀（VNA）等對鈷/碳納米纖維復(fù)合材料的微觀結(jié)構(gòu)、物相成份、磁性能和電磁參數(shù)進行表征，并通過反射率計算對其微波吸收性能進行研究。研究結(jié)果表明，當碳化溫度為700 ℃時，該納米纖維復(fù)合材料與石蠟混合物在低負載（質(zhì)量分數(shù)為~3%）、薄厚度（4.5 mm）下的反射損耗為-43.6 dB。

Abstract:

With the development of electronics industry, microwave absorbing materials with comprehensive characters of“thin, wide, light and strong” are highly expected. It is theoretically and practically important to develop a new type of carbon-based absorbing composite material with light weight, high efficiency, simple preparation process and low cost. Here, as a naturally rich and renewable resource， bacterial cellulose (BC), whose surface is rich in oxygen-containing groups for capturing Co2+, is used as a carbon precursor to prepare Co/carbon nanofiber composite by freeze-drying and one-step carbothermal reduction. is used as a carbon precursor to prepare Co/carbon nanofiber composite by freeze�瞕rying and one-step carbothermal reduction. Field emission scanning electron microscope (FE�睸EM), transmission electron microscope (TEM), X-ray diffractometer (XRD), Raman spectroscopy (Raman), X-ray photoelectron spectrometer (XPS), vibration sample magnetometer (VSM) and vector network analyzer (VNA) etc. are used to characterize the microstructure, phase composition, magnetic properties and electromagnetic parameters of the Co/carbon nanofiber composites, and the reflection loss is calculated to study the microwave absorption performance. At the carbonization temperature of 700 ℃, the Co/C/parafin sample with a thickness of 4.5 mm and a low mass loading of ~3% has a minimum reflection loss of -43.6 dB.