Electromagnetic and microwave-absorbing properties of magnetite decorated multiwalled carbon nanotubes prepared with poly(N-vinyl-2-pyrrolidone) |
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| Authors: | Chunying Zhao Aibo Zhang Yaping Zheng Jingfan Luan |
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| Affiliation: | 1. Multifunctional Materials and Structures, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;3. International Research Centre for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;4. Micro-optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an 710032, Shaanxi, China;5. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;6. College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118 Guangdong, China;1. Institute of Science and Technology, Universidade Federal de São Paulo – ICT/UNIFESP, Rua Talim, 330, São José dos Campos, SP, Brazil;2. National Institute of Space Research – INPE, Av. dos Astronautas, 1758, São José dos Campos, SP, Brazil;3. Tecnological Institute of Aeronautics – ITA, Praça Mal. do Ar Eduardo Gomes, 50, São José dos Campos, SP, Brazil;4. University Center of United Metropolitan University (FMU), Brazil;1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, 310018, China;2. Interdisciplinary Graduate School of Science and Technology, Shinshu University, Tokida, Ueda, 386-8576, Japan |
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| Abstract: | The magnetite (Fe3O4) decorated multiwalled carbon nanotubes (MWNTs) hybrids were prepared by an in situ chemical precipitation method using poly(N-vinyl-2-pyrrolidone) (PVP) as dispersant. The structure and morphology of hybrids are characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and transmission electron-microscopy (TEM). The TEM investigation shows that the Fe3O4/MWNTs hybrids exhibit less entangled structure and many more Fe3O4 particles are attached homogeneously on the surface of MWNTs, which indicated that PVP can indeed help MWNTs to disperse in isolated form. The electromagnetic and absorbing properties were investigated in a frequency of 2–18 GHz. The results show that the Fe3O4/MWNTs hybrids exhibit a superparamagnetic behavior and possess a saturation magnetization of 22.9 emu/g. The maximum reflection loss is ?35.8 dB at 8.56 GHz, and the bandwidth below ?10 dB is more than 2.32 GHz. More importantly, a new reflection loss peak occurs at the frequency of 14.6 GHz, which indicates that the Fe3O4/MWNTs hybrids have better absorption properties in the high-frequency. |
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