Multiwalled nanotubes (MWNTs) were heat-treated with zinc (Zn) at various temperatures. Hereby, zinc oxide (ZnO) was produced on the outermost shells of MWNTs in the forms of ultrathin films, quantum dots, or nanowires/nanorods. ZnO nanowires were grown on the surface of MWNTs without the presence of a catalyst, suggesting the vapor–liquid–solid mechanism is not applicable for the current growth process. The average diameter of nanowires on MWNTs prepared at 600 °C was about 30 nm and the length was up to 1.5 μm, yielding aspect ratios of 7 to 50. ZnO nanorods grown on MWNTs at 800 °C had diameters from 80 to 150 nm with lengths from 0.5 to 1 μm (aspect ratios of 6 to 10).
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Kim et al. (2002) studied this question.
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