Correlation between Resistance and Field Emission Performance of Individual ZnO One-Dimensional Nanostructures

Abstract

Both electrical and field emission measurements were carried out to study the correlation between resistance and field emission performance of individual one-dimensional (1D) ZnO nanostructures. Three types of 1D ZnO nanostructures were investigated (i.e., agave-like shape, pencil-like shape, and hierarchical structure) and were prepared by thermal chemical vapor transport and condensation without using any catalyst. The 1D ZnO nanostructures have obvious differences in resistance and thus conductivity from type to type. In addition, in the same type of 1D ZnO nanostructure, each individual emitter may also have variation in resistance and thus in conductivity. The field emission performance of the ZnO emitters was found to be strongly correlated with the resistance of each individual ZnO nanostructure: (i) a ZnO emitter with low resistance will have better emission; (ii) a high resistance region in a ZnO nanostructure is liable to the initiation of a vacuum breakdown event. The results indicate that, besides the uniformity in the geometrical structure, the uniformity in conductivity of the emitters in an array should be ensured, in order to meet the requirement of device application.

Template Deformation‐Tailored ZnO Nanorod/Nanowire Arrays: Full Growth Control and Optimization of Field‐Emission

“…An emission current density of 1 mA cm À2 (the minimum required to produce a luminescence of 300 cd m À2 for a video graphics array field-emission display with a typical high-voltage phosphor screen efficiency of 9 lm W À1 ) is achieved at 3.8 V mm À1 , which is also very low compared to other reported values. [8][9][10][11][12][13][14][15][16][17][18] Additionally, the emitting current density can be as high as 2.5 mA cm À2 , which is the highest among all the reported to date. [8][9][10][11][12][13][14][15][16][17][18] The corresponding Fowler-Nordheim (F-N) plot fits well to a line.…”

“…In reality, the FE properties are affected by many parameters, for example, the radius of curvature of a single emitter, the uniformity and density of the emitters, [8][9][10][11][12][13][14][15][16][17][18] and so forth. These factors could be simultaneously controlled by the presently developed method for ultimate improvements in field emission.…”

“…[8][9][10][11][12] FE is based on the physical phenomenon of quantum tunneling, during which electrons are injected from a material surface into vacuum under the action of an applied electric field. Since the discovery of carbon nanotubes (CNTs), much attention has been paid to explore the prospects of one-dimensional (1D) nanostructures as field-emitters because of their low work functions, high aspect ratios, high mechanical stabilities and conductivities, and so forth.…”

Tungsten Oxide Nanowires Grown on Carbon Cloth as a Flexible Cold Cathode

“…indicated that the conductivity of the cold cathode is a very important factor affecting fi eld emission properties. [ 26 ] The conductance of the TONWs was roughly studied through a carbon cloth-TONW-Cu plate sandwich structure which is shown in the upper inset of Figure 3b . From the I -V curve shown in Figure 3b , we can calculate the resistance of the carbon cloth-TONW-Cu plate sandwich structure which is only 3.22 Ω .…”

Nano‐ und Mikrofabrikation von Zinkoxid aus Koordinationspolymertemplaten

“…[12] Eine interessante neue Entwicklung geht auf Xu und Mitarbeiter zurück, die zeigten, dass feine Unterschiede bei einzelnen eindimensionalen ZnO-Nanostrukturen zu ausgesprochen unterschiedlichen elektrischen und Feldemissionseigenschaften führen. [13] Viele Synthesemethoden -von konventionellen Festkör-persynthesen bis zu modernen Verfahren wie der physikalischen Gasphasenabscheidung -wurden zur Herstellung definierter ZnO-Nanostrukturen genutzt. [2c,d] Mit ihrem katalysatorfreien Dampf/Festkörper-Wachstumsverfahren wurden Wang et al zu Wegbereitern der Synthese von eindimensionalen ZnO-Nanomaterialien wie Nanogürteln und Nanofedern mit Längen von mehreren zehn bis einigen hundert Mikrometern.…”