科研之友
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摘要
Many efforts have been done to get multiwalled carbon nanotubes (MWCNT) using nickelocene as catalytic agent. However, characteristics such as an aligned growth and high yield have not been achieved yet. This work presents an alternative method to improve the growth efficiency, using nickelocene and manganese oxide covered tubing as catalyst and substrate respectively. The manganese oxide (Mn0x) thin film was deposited using an improved aerosol assisted chemical vapor deposition system. Subsequently, MWCNT were grown by spray pyrolysis, inside the MnOx covered tubing. Different temperatures were tested from 800 to 900 degrees C. The higher yield was achieved at 800 degrees C, obtaining MWCNT of around 30 mu m and 50 nm of length and diameter, respectively. Surface morphology and chemical composition of the film and MWCNT were studied by scanning electron microscopy and X-ray energy dispersive spectroscopy (EDS). The crystalline structure was analyzed by X-ray diffraction. High resolution transmission electron microscopy studies of the MWCNT and cross section of the interface film-MWCNT evinced the interaction of the MnOx and Ni catalyst in the root of well aligned carbon nanotubes. Diffusion of Ni into the MnOx film was found by EDS. Nanobeann diffraction of the cross section was consistent with X-ray diffraction results.
- 出版日期2015-6
