Luminescence uniformity studies on dendrite bamboo carbon submicron-tube field-emitter arrays

Abstract

This is a study on the field emission (FE) from carbon submicron-tube multiwall covered with carbon nanotubes (MWCNTs), which forms a dendrite structure as a field-emitter array, by chemical vapor deposition method. To improve the FE luminescence uniformity, the bamboo carbon submicron tubes are grown on a reactive current limiting layer. We show that the same screening effect observed on MWCNT field emitters has been eliminated because the emitter tip distance of bamboo carbon submicron tubes is large enough, such as larger than twofold the diameter. A low turn-on field of ∼1.1V∕μm and a high current density of ∼500μA∕cm2 were obtained. The FE aging property curve shows current stability has been improved, and the luminescence uniformity has been improved as can be seen from the luminescence photo with four layers.

Field Emission Properties of the Dendritic Carbon Nanotubes Film Embedded with ZnO Quantum Dots

“…Both the electronic transmission channels and the ratio surface area of the material increased in this kind of special dendritic structure. The nanostructure of zinc oxide particles (XRD was reported in previous work [6][7][8][9]) covered the dendritic carbon nanotube surface evenly as shown in Figures 3(a) and 3(b). The further TEM analysis also indicated that there are some zinc oxide quantum dots, which are less than 20 nm, embedded in the nanotubes as shown in Figure 3(c).…”

“…Some research groups had tried to improve the cathode film field emission property by optimizing the growth process of carbon nanotube on substrate [2][3][4][5]. Li research group improved contact performance by inserting a transition layer between carbon nanotubes and substrate [6][7][8][9]. Chen group [10,11] discovered that the electron tunneling would be affected by the contact surface barrier between carbon nanotubes and substrate.…”

Carbon nanotube cathodes covered on the cylindrical surface of a fiber

“…[11][12][13] The growth temperature range was from 800 C to 900 C for 15 min. The substrate is a quartz optical ber with a polymer coating layer and a cladding layer.…”

“…The metal phthalocyanines in this method of growth process acted not only as a carbon source but also as a metallic catalyst, 10 which has been reported in a previous work. [11][12][13] The growth temperature range was from 800 C to 900 C for 15 min. The ow rates of hydrogen and argon were 25 sccm and 60 sccm, respectively.…”

Experimental and theoretical study on field emission properties of zinc oxide nanoparticles decorated carbon nanotubes

“…[9,10] Some groups have focused on the nanostructures of the ZnO nanoparticles coated on the surface of multi-wall carbon nanotubes (ZnO/CNTs composites). [11][12][13][14] Theoretical research has shown that the electron energy state of the CNT surface is the key factor influencing the emission current and threshold field, because the electron structure of the CNT shows a unique quantum state. Fairchild's group, [15] Choi's group, [16] and other groups have reported that the composite interface helps the electron overflow from the surface by reducing the work function, and studied the electronic structure, spectral properties, and surface state with the DFT and molecular dynamics method.…”