Au-assisted growth approach for vertically aligned ZnO nanowires on Si substrate

摘要

We have described a Au-assisted approach for growth of vertically aligned ZnO nanowires on Si substrate by metal-organic chemical vapor deposition. By employing an annealed Au/Si substrate, on which Au nanoislands are homogeneously distributed, vertically aligned ZnO nanowires on a Si substrate are resulted. Photoluminescence measurement shows that the near-band emission intensity of these ZnO nanowires is significantly improved compared with the ZnO film grown directly on a Si substrate. Extensive characterization by transmission electron microscopy has been made and the growth mechanism of these ZnO nanowires is discussed.