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In this study, we fabricated a cathode using screen printing method with carbon nanotubes and ZnO nanotetrapods as cathode emission materials and CsI nanoparticles as coating materials. After several comparative experiments, we find that 3g CsI dispersed into an organic paste which is composed of 20ml terpineol and 1g ethyl cellulose has significant results to improve the performance of the field...
Carbon nanotubes (CNTs) have excellent performance in field emission [1-3]; they can be used as field emission (FE) cold cathodes. The traditional FE cold cathode is difficult to apply to the microwave electronic devices. In this paper, we used thermal chemical vapor deposition to synthesize CNTs directly on the surface of traditional thermal-cathode by self-heated. The result proved that the field...
We report about field emission properties of various arrays of vertically aligned CNT blocks. Multiple emitters per block resulted in nearly aligned and efficient cathode performances. Stable currents up to 300 (100) μA have been achieved for the pure (TiO2 coated) CNT blocks.
As we know, the unsatisfactory field emission from the films by electrophoresis is resulted from the weak adhesion. The main aim of this paper is to improve the adhesion surrounding electrophoresis technologies. In addition, A simple controllable method is reported for the coating of ZnO nanowires with Ag nanoparticles and ZnO/Carbon nanotubes (CNT) composite.
Carbon nanotube pillar arrays (CPAs) for cold field emission were fabricated using a conventional photolithography process, and the geometry of these arrays was studied and the effect of pillar height on field emission was quantified. Our CPA samples achieved turn-on fields as low as 0.9 V/mum and stable current densities of 10 mA/cm2 at applied field lower than 6V/mum.
Wide-band-gap semiconductors such as indium, tin, molybdenum, and chromium oxides have stimulated considerable attention in recent years as promising cold-cathode materials due to their remarkable physical and chemical stability during the cold electron emission process. Especially, indium oxide (direct band gap : 3.6 eV) can be one of the most attractive conductive oxides for field emission because...
The effects of shape and the surface area of cathode support structure on the field emission properties of carbon nanotube cathodes are investigated and quantified in this paper. This study demonstrates that the overall structural geometry, specifically the area of the cathode support structure, plays a significant role and should be considered in the design rules for optimization of electron source...
Excellent electronic emission is a very important issue for cold cathode application. We have study the effect of growth environment on the CNTs film cold cathode. With using a pretreatment process of the growth environment in thermal chemical vapor deposition method, the better morphology and structure of the CNTs film were obtained, and the field emission properties of the CNTs film were improved
Layers of non-directional carbon nanotubes (CNTs) are currently used as field emission (FE) cathodes. The main advantage for such cathodes is the low cost fabrication process using conventional film deposition techniques such as screen-printing or imprint. This advantage is unfortunately counter-balanced by the non-uniformity and low density of the field emission sites, a consequence of its mat-like...
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