Abstract
A simple, low-temperature solution route was reported for the coating of ZnO nanoarrays with Ag nanoparticles. Ag nanoparticles were decorated on the surface of ZnO nanoarrays, which was demonstrated by field emission scanning electron microscopy and X-ray photoelectron spectroscopy. Additionally, the ZnO/Ag composite nanoarrays manifested high surface-enhanced Raman scattering (SERS) sensitivity of 10−6 M rhodamine 6G with a maximum enhancement factor of 1.24 × 105. Moreover, the field emission property of the ZnO/Ag composite nanoarrays was studied in details. The turn-on field of the ZnO/Ag composite nanoarrays was 6.3 V/µm, and the threshold field was 11.4 V/µm. The field enhancement factor of the ZnO/Ag composite nanoarrays was about 1927. These superior properties indicated that the ZnO/Ag composite nanoarrays could be a good cathodes candidate for SERS detection and field emission.
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