Abstract
Using an alcohol gas source method, carbon nanotubes (CNT) were grown on a ZnO(0001̄) surface without any underlayers. At 700 °C under an ethanol pressure of 1×10-1 Pa, high-density CNTs could be grown using a Co catalyst. However, after the growth, the ZnO surface became rough, accompanied by the occurrence of striped structures along the a-axis. Reducing the growth temperature and ethanol pressure and using a Pt catalyst, CNT growth could be achieved on the ZnO(0001̄) face without the formation of surface roughness. The reaction between the catalyst and the ZnO surface was also investigated using X-ray photoelectron spectroscopy.
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