Field emission and photofluorescent characteristics of zinc oxide nanowires synthesized by a metal catalyzed vapor-liquid-solid process

Abstract

Articles you may be interested inOn the origin of enhanced photoconduction and photoluminescence from Au and Ti nanoparticles decorated aligned ZnO nanowire heterostructures The ZnO nanowires synthesized by vapor-liquid-solid growth mechanism with Cu and Au as the catalyst were investigated. The principal differences in morphology between Cu and Au catalyzed ZnO nanowires are observed and lead to significant differences in their field emission and photofluorescent characteristics. The Cu catalyzed ZnO nanowires with a high-quality wurtzite structure were grown vertically on p-type Si͑100͒ substrate along ͓0002͔ direction. A strong ultraviolet emission at 381 nm is observed. These ZnO nanowires show excellent field emission properties with turn-on field of 0.83 V/m and corresponding current density of 25 A/cm 2 . The emitted current density of the ZnO nanowires is 1.52 mA/cm 2 at a bias field of 8.5 V/m. The large field emission area factor, ␤ arising from the morphology of the nanowire field emitter, is partly responsible for the good emission characteristics. The ZnO nanowires with high emission current density and low turn-on field are expected to be used in field emission flat panel display.

Nanostructured ZnO Materials: Synthesis, Properties and Applications

“…Several scientific works have reported the use of catalysts, such as nanoparticles of Au or other metals, deposited directly onto substrates to selectively grow nanorods and nanowires [20,[58][59][60][61][62][63]. In fact, on an amorphous surface or under lattice mismatching conditions, ZnO nanowires tend to grow in random directions.…”

Strategies to Improve Field Emission Performance of Nanostructural ZnO

“…7 In fact, there are some reports on FE from nanostructural ZnO. [8][9][10][11] Some researchers even coated ZnO nanoparticles on the CNT surface to improve the FE performance. 12,13 Although many valuable results have been reported, the general methodologies of realizing an effective ZnO field emitter have not been revealed.…”

Micro-Raman and photoluminescence study of urchin-like ZnO structure assembled with nanorods synthesized by hydrothermal method

“…It is a versatile smart material that has unique applications in catalysts, sensors, piezoelectric transducers and actuators, photovoltaic, and surface acoustic wave devices [3]. ZnObased one-dimensional nanostructures in various forms including nanowires [4][5][6][7][8], nanoneedles [9][10][11], nanopins [12], nanorods [13], nanopencil [14], and tetrapod-like nanostructures [15,16] have attracted considerable attention for application as room temperature UV lasing emission source, as electron emitting sources, gas sensors, as field effect transistors, and so on. The field emission test results of these ZnO nanostructures showed that electrons are more easily emitted from nanostructures with sharp tips [9-16] than nanostructures with a uniform diameter [5][6][7].…”