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 carbonbased EMI materials.

    Abstract
    1 Introduction
    2 Experiment
        2.1 Preparation of CNTFe3O4 film
        2.2 Characterization
    3 Results and discussion
    4 Conclusion
    Acknowledgements 
    References

• Zhuo Chao(School of Materials Science and Engineering, Shanghai University, Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics)
• Yingying Yu(Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics)
• Fang Lei(School of Materials Science and Engineering, Shanghai University)
• Dongmei Hu(Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics)