We have successfully fabricated 4.75‐inch CNT‐FED with sturdy metal plates as spacer. The metal plates were etched numerous holes and coated oxide to supply high efficient passage for electrons. We observed that several metal plates not only helped cathode to shield high electric field from anode but also supplied sturdy spacer between cathode and anode. In this work, a uniformity lighting image is obtained and capable of being applied to large‐area CNT‐FEDs.
A novel 3-fold dynode structure was introduced into the CNT-FED for improving its uniformity and electron amplification. The 0.5" and 5.6" dynode of metal plates was etched with numerous holes of various cross-sections and coated oxides to supply high efficient passage for electrons. Experiments have been carried out to study the effects of oxides and oxide film thickness on the electron multiplication of dynodes. We observed that several metal plates not only shield the cathode from the high electric field of anode, but also distribute uniform electrons inside each pixel cavity. At present the 3-fold dynode exhibits electron multiplication factors larger than, but close to, unity.
In this paper, the carbon nanotubes (CNTs) are synthesized on the micro graphite flakes using mixtures of C2H2 and H2 gases by thermal chemical vapor deposition. We spin the graphite solution on the silicon wafer and dry it, then synthesize the CNTs on the graphite flakes. The synthetic process is a catalyst free technique and the CNTs have no metal inside, so this is an easier technique for synthesizing the CNTs. We change the synthetic time to obtain the optimal conditions for synthesis of the CNTs. The experimental results show that the density and quality of the CNTs could be controlled significantly by the synthetic time. Besides, the field emission properties of the CNTs are also affected greatly by it. The emission current density of the CNTs is 0.5 mA/cm2 at 3 V/μm, and the turn on field is 2.3 V/μm.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.