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

Abstract

Response on the effects of individual differences of common carbon nanotubes on the field emission current stability and the luminescence uniformity of cathode film, a new type of cathode film made of dendritic carbon nanotubes embedded with Zinc oxide quantum dots is proposed. The film of dendritic carbon nanotubes was synthesized through high-temperature pyrolysis of iron phthalocyanine on a silicon substrate coated with zinc oxide nanoparticles. The dendritic structure looks like many small branches protrude from the main branches in SEM and TEM images, and both the branch and the trunk are embedded with Zinc oxide quantum dots. The turn-on field of the dendritic structure film is∼1.3 V/μm at a current of 2 μA, which is much lower than that of the common carbon nanotube film, and the emission current and the luminescence uniformity are better than that of the common one. The whole film emission uniformity has been improved because the multi-emission sites out from the dendritic structure carbon nanotubes cover up the failure and defects of the single emission site.

A novel investigation on carbon nanotube/ZnO, Ag/ZnO and Ag/carbon nanotube/ZnO nanowires junctions for harvesting piezoelectric potential on textile

“…Nonlinearity in all three curves indicate that, the junction between AFM (Platinum coated) tip and ZnO NWs is a Schottky junction. 36 The difference in the amount of current magnitudes in all I-V characteristics might be due to the surface roughness of the non-conductive and conductive textiles. Other reasons might be the variation in the resistance or it might be due to a difference in the surface bending of the ZnO NWs on conductive textile and on CNTs coated textile.…”

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.…”

Fabrication of cone-shaped CNF/SiC-coated Si-nanocone composite structures and their excellent field emission performance

“…It has been shown recently that materials with elongated geometry, 21 increased emission sites, 22 sharp/protruded edges, 23 defective/ disordered structures, 24 or lower local work function 25 can greatly enhance their FE properties. For our CNF/SiC-coated Si-NC composite structures prepared by 5-20 min, the samples contain bundles of CNFs on nanocone tips, where each nanofiber may be considered as an individual field emission site.…”