( 中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 在具有納米級孔洞的多孔氧化鋁模板上, 用電沉積方法制備出α-Fe納米線有序陣列組裝膜。 用10%NaOH將納米線溶液解離， 并使之與樹脂混合均勻，制成隨機分布Fe納米線/絕緣體復合吸波材料, 并對其吸波性能進行了研究。 研究結果表明： 隨鐵納米線體積分數(shù)的提高， 隨機分布的Fe納米線/絕緣體復合吸波材料的電磁參數(shù)也隨之增大； 用測試電磁參數(shù)計算了不同厚度的反射率， 體積分數(shù)為25%隨機分布的鐵納米線/絕緣體的復合吸波材料最佳吸收厚度為1.14 mm； 在9.7 GHz時， 反射率達-45 dB， 小于-5 dB時， 反射率帶寬達到9 GHz；隨鐵納米線/絕緣體的復合吸波材料厚度的增加， 吸收峰位向低頻移動； 隨鐵納米線體積分數(shù)的增加， 其吸收率明顯增大， 同時最佳吸收厚度也減小。
關鍵字: 多孔氧化鋁模板； 納米線陣列； 吸波性能； 反射率
iron nanowire composites distributed randomly
（ State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: The α-iron nanowires array films were prepared by electrochemical deposition on the porous anodic aluminum oxide template with nanopores. The α-iron nanowires were liberated in the 10% NaOH solution and equably mixed with resin. Then, the iron nanowire/ nonconductor composites distributed randomly were prepared， and the microwave absorbing properties of composites were studied. The results show that the electromagnetic parameters of the absorbing materials increase with increase of the iron nanowires volume fraction. Reflection coefficients of the absorbing materials were calculated with the electromagnetic parameters tested. The optimal absorbing thickness of iron nanowires composites with 25% volume fraction is 1.14 mm. When the frequency is 9.7 GHz, the reflection coefficient is -45 dB, and when the reflection coefficient is less than -5 dB, the broad band is 9 GHz. The location of reflection coefficient apex is moved to the low frequency with the thickness of absorbing material increasing. With increase of the iron nanowires volume fraction, the reflection coefficients increase greatly and the optimal thickness decreases at the same time.
Key words: porous anodic aluminum oxide template；nanowire array；microwave absorbing properties；reflection coefficient
