Synthesis and magnetic properties of aligned carbon nanotubes by microwave-assisted pyrolysis of acetylene |
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| Institution: | 1. Institute of Applied Laser, Photonics and Surface Technologies, Bern University of Applied Sciences, Quellgasse 21, 2502 Biel, Switzerland;2. LAboratoire PLAsma et Conversion de l''Energie, LAPLACE, Université de Toulouse, CNRS, INPT, UPS, 118 route de Narbonne, 31062 Toulouse Cedex 9, France;3. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, 3602 Thun, Switzerland |
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| Abstract: | Aligned carbon nanotubes with high quality were synthesized at low temperature by microwave-assisted pyrolysis of acetylene in nitrogen atmosphere. The morphology and structure of the products were characterized by field-emission scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction and Raman spectroscopy. The results indicated that the ACNTs with high crystallinity are densely packed, and some Fe3C nanoparticles are encapsulated in all parts of carbon tubes. In addition, the effect of the reaction temperature on the morphologies of the CNTs was also studied in detail. Magnetic measurements showed that the Fe3C-filled ACNTs display ferromagnetic properties at room temperature, and can be easily manipulated by an external magnetic field. |
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| Keywords: | Carbon nanotube Microwave Microstructure Magnetic property |
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