Abstract
Room-temperature photoluminescence (PL) measurements havebeen performed on single-crystal ZnO nanowires grown onSiO2/Si and quartz substrates by the vapor transport method using Au as a catalyst. Two emissionbands are apparent, one in the UV spectral region around 380 nm (3.26 eV) associated withexciton recombination processes and a much broader structure in the visible rangefrom 420 to 700 nm, which exhibits two distinct peak-like features around 520and 590 nm (2.38 and 2.10 eV). Spectrally resolved scanning near-field opticalmicroscopy (SNOM) of single ZnO nanowires have been performed for a directimaging of the PL emission with spatial resolution below 100 nm. SNOM resultsprovide evidence that the yellow emission band observed at 590 nm is a uniqueproperty of the ZnO nanowires, being most likely related to radiative recombinationprocesses associated with Au impurities introduced during the catalytic growth.
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