Abstract
Zinc oxide (ZnO) nanowires were synthesized on bare silicon substrates and sputtered-ZnO seeded substrates by hydrothermal method in mixture solution of zinc acetate and cooper acetate. The nanowires are in random alignment on the bare substrate, while the vertically aligned nanowires with a c-axis (002) preferential orientation are available on the ZnO seeded substrate. The near band-edge UV emission peaks on the PL spectra could be seen, indicating a good crystal structure of ZnO. With the increase of cooper concentration, the intensity of UV peak decreases but that of green emission peak enhances, which means the defects inside nanowires could be increased by the cooper additive. For the Raman measurement, there is 437 cm-1 centered peak for each sample, indicating that nanowires are perfect hexagonal wurtzite structure. In the Raman spectra, the 581.4 cm-1 centered peak attributed to oxygen vacancies could also be seen for the sample with cooper additive.
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