Lightweight and flexible electromagnetic interference (EMI) shielding materials are in great demand for wearable EMI device. In the present work, lightweight and flexible carbon nanotube (CNT)/ferroferric oxide (Fe₃O₄) composite film was made through a feasible chemical vapor deposition process for CNT film synthesis, followed by a hydrothermal reduction process for Fe₃O₄ coating. In the as-prepared composite, CNT film and Fe₃O₄ particles work as conductive skeleton and strong magnetic particle, respectively. The as-prepared composite film shows a novel EMI shielding effectiveness (SE) of 91 dB in the X-band, a small thickness of 0.09 mm and a low density of 0.86 g/cm³, which is superior to most of the carbon-based EMI materials.

轻便且具有柔性的电磁干扰（EMI）屏蔽材料对可穿戴EMI器件提出了很高的要求。在本工作中，通过可行的化学气相沉积工艺合成CNT薄膜，然后进行水热还原法制备Fe ₃ O ₄涂层，制得了轻巧而柔软的碳纳米管（CNT）/三氧化二铁（Fe ₃ O ₄）复合膜。。在制备的复合物中，CNT膜和Fe ₃ O ₄颗粒分别充当导电骨架和强磁性颗粒。所制备的复合膜在X波段显示出91 dB的新型EMI屏蔽效果（SE），0.09 mm的小厚度和0.86 g / cm ^3的低密度，它优于大多数基于碳的EMI材料。