Optical and field emission properties of Zinc Oxide nanostructures.
Zinc Oxide (ZnO) nano-pikes were produced by oxidative evaporation and condensation of Zn powders. The crystalline structure and optical properties of the ZnO nanostructures (ZnONs) greatly depend on the deposition position of the ZnONs. TEM and XRD indicated that the ZnONs close to the reactor center, ZnON-A, has better crystalline structure than the ZnONs away from the center, ZnON-B. ZnON-A showed the PL and Raman spectra characteristic of perfect ZnO crystals, whereas ZnON-B produced very strong green emission band at 500 nm in the photoluminescence (PL) spectrum and very strong Raman scattering peak at 560 cm(-1), both related to the oxygen deficiency due to insufficient oxidation of zinc vapor. ZnON-B exhibited better field emission properties with higher emission current density and lower turn-on field than ZnON-A.
Pan
Hui
H
Department of Physics, National University of Singapore.
Zhu
Yanwu
Y
Ni
Zhenhua
Z
Sun
Han
H
Poh
Cheekok
C
Lim
Sanhua
S
Sow
Chornghaur
C
Shen
Zexiang
Z
Feng
Yuanping
Y
Lin
Jianyi
J
D003460:Crystallization / Q000379:methods*; D008027:Light; D008029:Lighting / Q000295:instrumentation / Q000379:methods; D008163:Luminescent Measurements; D008422:Materials Testing; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods*; D011829:Radiation Dosage; D011874:Radiometry; D012666:Semiconductors; D013499:Surface Properties; D015034:Zinc Oxide / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects*
D015034:Zinc Oxide