材料科学
反射损耗
微波食品加热
碳热反应
介电损耗
纳米颗粒
复合材料
电介质
吸收(声学)
复合数
化学工程
纳米技术
光电子学
电信
工程类
碳化物
计算机科学
作者
Wanxi Li,Hongxue Qi,Yi‐en Du
标识
DOI:10.1166/jnn.2017.14192
摘要
As electromagnetic pollution is becoming more and more serious, novel composite microwave absorbents are gaining much attention. In this work, Fe–Fe 3 C/C fibers were successfully synthesized by using low-cost cotton as carbon source. The synthetic route was an easy and flexible two-step approach consisting of immersion and subsequent carbothermal reduction in N2 atmosphere. The results showed that the Fe–Fe 3 C nanoparticles were uniformly loaded on the cotton-based carbon fibers. Resulting from the synergistic effect of magnetic loss from Fe–Fe 3 C nanoparticles and dielectric loss from cotton-based carbon fibers, a wide region of microwave absorption was achieved. When the thickness is 1.5 mm, the minimum reflection loss (RL) is −28.3 dB, and the effective bandwidth of RL less than −10 dB could reach up to 4.2 GHz. Owing to the characteristics of cost-effective synthetic route, low density, low filling rate and good microwave absorption with thin thickness, the Fe–Fe 3 C/C fibers could be used as a practical microwave absorbent.
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