Growth, photoluminescence, and field emission of hierarchical ZnO nanostructures.
Hierarchical ZnO nanostructures with the morphology of sleeve-fishes have been fabricated on Si substrate through vapor phase transport at 850 degrees C. Studies find that each nansleeve-fish is composed of a screw-shaped microrod and some tapering nanowires grown on the microrod, all of which grow along the [0001] direction. Photoluminescence spectra exhibits strong UV emission around 385 nm without any green emissions detected, indicating that the high-quality ZnO nanostructures with low level of oxygen vacancies are obtained in our experiment. Field-emission measurements on the nanosleeve-fishes show a turn-on field as low as 2.2 V/microm at a current density of 0.1 microA/cm(2) with a anode-sample separation of 600 microm, and the emission current density reached 1 mA/cm(2) at an applied field of about 5.8 V/microm. The excellent field emission properties from such kind of nanostructures make them promising candidates for further applications in FE microelectronic devices.
Xu
Feng
F
Department of Electronic Engineering, East China Normal University, Shanghai 200062, PR China.
Yu
Ke
K
Shi
Meirong
M
Wang
Qingyan
Q
Zhu
Ziqiang
Z
Huang
Shaohua
S
D003460:Crystallization / Q000379:methods*; D004563:Electrochemistry / Q000379:methods*; D008029:Lighting / Q000379:methods; D008163:Luminescent Measurements / Q000379:methods; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D010777:Photochemistry / Q000379:methods*; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
D046911:Macromolecular Substances; D015034:Zinc Oxide