Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 12, Pages 6675-6681Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301848a
Keywords
ZnO nanopillars; vapor transport deposition; Au nanoparticles; field emission; turn-on field; current density
Funding
- National Science Council of Taiwan [NSC 100-2811-M-009-037]
- MOE-ATP program
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The structural and optoelectronic properties of ZnO nanopillars (ZnO-NPs) grown on Si substrates by the vapor transport deposition method were investigated. In particular, by varying the deposition duration and hence the morphology of the vertically aligned ZnO-NPs, the resultant field emission characteristics were systematically compared. In addition to identifying the advantageous field emission properties exhibited in the pencil-like ZnO-NPs, we observed that by adhering Au nanoparticles on the surface of the ZnO-NPs the turn-on field and the maximum current density can be drastically improved from 3.15 V/mu m and 0.44 mA/cm(2) at 5 V/mu m for the best ZnO-NPs to 2.65 V/mu m and 2.11 mA/cm(2) at 5 V/mu m for Au/ZnO-NPs, respectively. The enhancement of field emission characteristics that resulted from Au-nanoparticle decoration is discussed on the basis of charge-transfer-induced band structure modifications.
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