Field emission from well-aligned zinc oxide nanowires grown at low temperature

Abstract

Field electron emission from vertically well-aligned zinc oxide ͑ZnO͒ nanowires, which were grown by the vapor deposition method at a low temperature of 550°C, was investigated. The high-purity ZnO nanowires showed a single crystalline wurtzite structure. The turn-on voltage for the ZnO nanowires was found to be about 6.0 V/m at current density of 0.1 A/cm 2. The emission current density from the ZnO nanowires reached 1 mA/cm 2 at a bias field of 11.0 V/m, which could give sufficient brightness as a field emitter in a flat panel display. Therefore, the well-aligned ZnO nanowires grown at such low temperature can promise the application of a glass-sealed flat panel display in a near future.

Growth and characterization of ZnO needles

“…Various methods, such as precipitation (Lee et al 2002), sol-gel (Rani et al 2008), vapor-liquid-solid (VLS) growth (Ham et al 2005), chemical vapor deposition (CVD) (Zeng and Ye 2005), thermal decomposition (Zhao et al 2007), metal organic vapor-phase epitaxy (Li et al 2000), have been developed for controlling ZnO structures, since its various properties strongly depend on its structures including the crystal size, orientation, morphology, aspect ratio and even crystalline density. Currently, many interesting ZnO nanostructures including nanorods (Lucas and Mai 2007), nanowires (Xiang et al 2007), tetrapods (Chen et al 2007), nanocombs (Li et al 2008), nanotubes (Anas and Mangalaraja 2010), nanopencils (Shen et al 2006) and star-like (Peng et al 2010) have been successfully synthesized.…”

Optical emission spectroscopic studies on laser ablated zinc oxide plasma

“…Recently there has been much interest in the growth and optical characteristics of ZnO films for ultraviolet ͑UV͒ and blue light emitting device applications. ZnO films generally exhibit n-type conductivity which can further be improved and stabilized by doping with Al or Ga. [2][3][4] The high conductivity, together with broad optical transparency, has prompted extensive investigations of ZnO films as transparent electrodes for flat-panel displays, 5 thin film transistors, 6 and solar cells. 7 ZnO films have been grown by a variety of methods, such as radio-frequency ͑rf͒ and direct-current ͑dc͒ sputtering, 3,8,9 chemical vapor deposition, 10 spray pyrolysis, 11 electron-cyclotron-resonance-assisted molecular beam epitaxy, 12 and pulsed laser deposition ͑PLD͒.…”

The role of ammonia hydroxide in the formation of ZnO hexagonal nanodisks using sol–gel technique and their photocatalytic study

“…ZnO nuclei are crystallised as a result of the reaction of [Zn(NH 3 ) 4 ] 2C complex ions and OH ¡ ions as shown in reaction (7). The tetrahydroxozincate ions, Zn(OH) 4 2¡ , which have an octahedral geometry, agglomerate in the solution.…”

“…[1] Due to these unique properties, it has been demonstrated to have potential applications in ultraviolet (UV) lasers, [2] fieldeffect transistors, [3] gas sensors, [4] biosensors, [5] photocatalysts, [6] field-emission displays [7] and nanogenerators. [8,9] One-dimensional (1D) ZnO nanostructures such as ZnO nanorods [10] and ZnO nanowires [11] have become research focus because of their high aspect ratio.…”