Stable field emission from hydrothermally grown ZnO nanotubes

Abstract

Zinc oxide nanotube arrays were prepared by hydrothermal reaction in ammonia and zinc chloride solutions, and the field emission properties were tested. The turn-on field of the field emission was extrapolated to be about 7.0 V / m at a current density of 0.1 A/cm 2 . Meanwhile, the emission current densities reached 1 mA/ cm 2 at a bias field of 17.8 V / m. The field enhancement factor ␤ was estimated to be 910. The field emission of the zinc oxide nanotubes showed good stability. The variation of emission current density was less than 10% during a 24 h test under a field of 15 V / m.

One-Dimensional and Two-Dimensional ZnO Nanostructured Materials on a Plastic Substrate and Their Field Emission Properties

“…The field enhancement factor " " is calculated from the slope of the straight line on the F-N plot, with the work function of ZnO taken to be 5.3 eV. 9 The estimated value for nanopillars (23 104) is found to be substantially higher than that for nanowalls (5256), which is also consistent with the lower turn-on field observed for the nanopillars. Moreover, the values for nanopillars and nanowalls obtained in the present work are comparable to and at the higher end of those reported for other ZnO nanostructures.…”

“…[1][2][3][4][5] It would therefore be of great practical interest to develop a lower temperature technique to synthesize ZnO nanostructures on lower cost substrates such as plastics for large-area applications. To date, only a few efforts have been made to characterize the FE properties of ZnO nanostructures obtained by low-temperature methods, [6][7][8][9][10] including the ZnO nanowire arrays synthesized by employing templates. 6,7 Although ZnO nanowires have also been grown successfully without templates by using an electrochemical technique, 8,[11][12][13] only one study has reported the FE properties of the electrodeposited material (with a high turn-on field).…”

One-dimensional ZnO nanostructures: Solution growth and functional properties

“…The turn-on field can be effectively lowered by modifying the ZnO tips with metal nanoparticles [335]. Stability of the emission current density is usually a big concern in field emission technology [336].…”

Swift Synthesis of ZnO Nanorods by Microwave Hydrothermal Method

“…ZnO nanorods are attracting much interest several applications such as nanophotonics [2], dyesensitized solar cells [3,4], electron field emitters [5,6], field effect transistors [7] and piezotronics [8]. Among various synthesis methods the microwave assisted hydrothermal synthesis has emerged as a powerful method for the synthesis of ZnO nanorods with some significant advantages such as cost effective large yield and less complicated technique [9].…”