title: Optical and field emission properties of Zinc Oxide nanostructures.
abstract: 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.
authors.affiliation: Department of Physics, National University of Singapore.
authors.forename: Hui
authors.initials: H
authors.lastname: Pan
authors.forename: Yanwu
authors.initials: Y
authors.lastname: Zhu
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Ni
authors.forename: Han
authors.initials: H
authors.lastname: Sun
authors.forename: Cheekok
authors.initials: C
authors.lastname: Poh
authors.forename: Sanhua
authors.initials: S
authors.lastname: Lim
authors.forename: Chornghaur
authors.initials: C
authors.lastname: Sow
authors.forename: Zexiang
authors.initials: Z
authors.lastname: Shen
authors.forename: Yuanping
authors.initials: Y
authors.lastname: Feng
authors.forename: Jianyi
authors.initials: J
authors.lastname: Lin
mesh_terms: 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*
chemical_list: D015034:Zinc Oxide