Field emission observation of carbon nanosheet thin film by photoelectron emission microscopy (PEEM)
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In this study, the field emission characterization of carbon nanosheet thin film was conducted using a diode configuration with an anode-cathode distance of 254 mum. Photoelectron emission microscopy (PEEM) was used to investigate the field emission uniformity over the surfaces of carbon nanosheet thin films.Keywords:
Nanosheet
Field emission display
Carbon fibers
Field electron emission cathodes were constructed from knitted fabrics comprised entirely of carbon nanotube (CNT) fibers. The fabrics consisted of a top layer array of ∼2 mm high looped structures and a bottom layer that was 1 mm thick with a flat underlying surface. Field emission (FE) experiments were performed on 25.4 mm diameter CNT fabric cathodes in both direct current (DC) and pulsed voltage (PV) modes, and the results were compared to those obtained from a CNT film cathode. The DC measurements were performed at a maximum voltage of 1.5 kV. The CNT fabric cathode emitted 20 mA, which was an 8× increase over the emission current from the CNT film cathode. The DC results were analyzed using the corrected form of the Fowler–Nordheim FE theory initially developed by Murphy and Good, which allows for the determination of the formal emission area and effective gap-field enhancement factor. The PV experiments resulted in Ampere level emission currents from both CNT fabric and CNT film cathodes. For a 25 kV, 500 ns voltage pulse, the CNT fabric cathode emitted 4 A, which was 2× more current than the CNT film cathode. Scanning electron microscopy imaging after PV testing revealed that the fibers remained intact after >5000 pulses. These results indicate that knitted CNT fabrics offer a promising approach for developing large area, conformable, robust FE cathodes for vacuum electronic devices.
Field emission microscopy
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With printed silver electrode and etched indium tin oxide (ITO) stripe, the double cathode-conducting-layer was developed on the cathode back plane. The lower ITO electrodes were composed of divided ITO film covered on the cathode back plane and the upper silver electrode was formed by the sintered silver slurry. And the cathode insulation layer was used to separate the lower ITO electrodes and the upper silver electrodes. Carbon nanotube used as field emitters, the fabrication research on the field emission display panel was performed. The main function for the double cathode-conducting-layer was to decrease the cathode voltage drop on the upper silver electrodes on the cathode back plane. The sealed small size field emission display panel possessed better image display performance.
Field emission display
Indium tin oxide
Cold cathode
Flat panel
Screen printing
Flat panel display
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Carbon nanotube field emission display has been regarded as one of the most promising flat panel displays due to its unique advantages. The morphology of the cathode material composed of the nanotubes will directly affect the field emission display properties. In this paper, we used single-walled carbon nanotubes synthesized by arc discharge method as the cathode material. This material was printed onto the conducting surface of the cathode plate using a screen-printing process. We studied the field emission properties of the cathode and the brightness of the green phosphor also screen printed on the anode. The display unit exhibited good field emission properties. The single-walled nanotube cathode was shown to have low turn-on voltage and high field emission current density.
Field emission display
Cold cathode
Screen printing
Flat panel display
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Summary form only given. Field emission display (FED) has advatanges in brightness, power consumption, color rendition, response time and operating temperature range. Early prototypes of triode-structured FED using Spindt-cathode were expensive to manufacture in large area. Using self-assembled one-dimensional nanomaterials such as carbon nanotubes (CNTs) and nanowires is a solution to this problem. The nanowire field emitters have the additional advantages of include better controlled electrical properties, feasibility of large area preparation and good field emission properties. In present talk, the recent results from our group about nanowire field emitters FED will be introduced. We prepared several one-dimensional nanowire emitters with excellent field emission performance. We also investigated a number of designs of gated microstructures and technical approaches for self-assembling nanowires inside these microstructures. Prototype field emission display devices have been fabricated. The results demonstrate the feasibility of large-area high-definition nanowire field emission display.
Field emission display
Triode
Nanomaterials
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A review on the working principle,emission characteristics and potential market of field emission displays is presented.The FED cathodes include field emissive array,carbon nanotube,metal-insulator-metal,surface-conduction electron emission and ballistic electron surface emission.The developing bottleneck of FED in technology,materials and processing is discussed,and a suggestion to speed up the researches of FED is also proposed.
Field emission display
Electron gun
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An experimental dismountable high-voltage field-emission display has been fabricated. It is used to demonstrate that gated structures may be adapted to the case where flat-film emitters are made of a carbon-nanotube–epoxy composite. Experiments have been carried out to study the field electron emission characteristics of the display unit and to optimize the structural parameters. Our findings indicate that it is very likely for one to produce a near-market prototype high-voltage field-emission display, if a more sophisticated fabrication and assembly technique is adapted.
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Field emission display
Flat panel display
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Field emission display
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Triode
Field emission display
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Carbon nanotubes have been recognized as one of the most promising electron field emitters currently available. The production process of field emission display with carbon nanotube is described in this paper. Recent progress in the research of field emission properties and display device is also introduced.
Field emission display
Electron gun
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