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Excellent electron-field emission properties of carbon nanotubes (CNTs) attract essential scientific and practical interests. The small gap between top of the emitter and the anode essentially increases the field enhancement facto. The screening effect reduces the field emission current of a CNT placed in an array of CNTs. This paper presents an analytical expression of the field enhancement factor...
In the present work, experiments have been carried out to study locally-grown ZnO nanowires on the drain-electrode of MOSFET by low-temperature solution-phase method and the effect of active control on field electron emission.
Summary form only given. Commercial expandable graphite was heat at 900 °C to get the worm-like graphene nanosheets. Using sulfuric acid and potassium permanganate to oxidize the expanded graphene nanosheet could further minish the thickness of graphene oxide sheet to less than 1nm, and this way to get the graphene was proved to be mass producible (tens of gram). Free-standing graphene oxide paper...
flat image sensor consisting of a Spindt-type field emitter array (FEA) and a high-gain avalanche rushing amorphous photoconductor (HARP) target has been studied with the aim of developing ultrahigh-sensitivity compact television cameras . This image sensor is called an FEA-HARP sensor. The output signal current of the FEA-HARP sensor is obtained by reading out holes that have accumulated on the HARP...
It is of special interest to obtain a single nanodimensional emitting protrusion on the surface of a tungsten carbide emitter, which would serve as an ideal point source of electrons and ions. However, it is difficult to grow a single nanodimensional protrusion on the surface of a tungsten carbide emitter. In this study, the task was solved as follows. In the course of a field crystal growth, each...
Laser-induced field emission from a single metal tip became the subject of intense research in recent years. Ultrafast electron pulses can be generated by the irradiation single metal tips with nanoscale apex by femtosecond laser pulses [1, 2]. This opens up possibilities for developing novel compact and coherent radiation sources in THz and X-ray wavelengths. For these applications that require high...
1-dimensional (1-D) nanocarbon materials such as carbon nanotubes [1] (CNTs) and carbon nanofibers (CNFs) are quite promising as electron emission sources [2] in the near future. These 1-D nanocarbon materials possess very high aspect ratio, thus readily allowing to emit electrons under relatively low applied electric fields even at low vacuum pressures. During the field emission (FE) process, degradation...
Summary form only given. The paper that we are going to present is about the characterization of field emission of a non-uniform distribution of emitters in a sphere-plane diode. In a recent article we showed that field emission in a non-uniform field can give information about the nonuniform distribution of emitters [1]. It can also explain the apparent non reproducibility of flat samples, which...
In this paper, the authors report a simple method can control the CNTs distribution. The emission properties of screen-printed CNTs were improved after using with a wetting and dispersing additive simultaneously. Moreover, the screening effect of the agglomerated CNTs emitters are also numerically studied.
In this paper, we are interested to develope a protrusive (or higher dimensional) CL law to account for the sharpness of the emitters. We propose a method of calculating the maximum applied electric field Ec, which occurs when the emitter surface electric field Es is equal to the space-charge electric field Esp.
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