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In this paper, the structure of ferroelectric cathode with a low dielectric constant film introduced between the ferroelectric material and the grid has been studied for increasing the triple junction electric field. Finite Element software ANSYS electric module is used for modeling of ferroelectric cathodes and basic geometry that was modeled is depicted in Figure 1. A voltage is applied on the rear...
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 a normally-on driving under-gate FED is proposed. In this structure, the ratio of the cathode width to the thickness of the dielectric layer is reduced significantly comparing with the traditional under-gate FED. In the new driving scheme, the field emission electrons are extracted from the whole cathode surface by the high anode voltage directly. The effect of the under-gate is to prevent...
In this paper, the cathode evaporation rate during current emission is measured. The quartz crystal microbalance (QCM) method is used to measure the thickness of the deposited active materials in vacuum. The principle of the QCM is that a frequency shift is introduced when evaporated materials are deposited on the crystal. The evaporation of active materials is measured at different cathode temperature...
In this paper, fabrication and characterization of QDSSCs based on CNT doped TiO2 mesopores film were reported. The improved efficiency is obtained for the device using CNT/TiO2/CdSe as the photoanode. The QDSSCs based on bare TiO2 and CNT doped TiO2 were named as sample A and B.
In the present paper, the field emission properties of mixture of carbon nanotubes, ZnO tetrapods and conductive particles is discussed. To improve the field-emission further, a field-emission cathode with special edge structure is proposed in this paper. In Figure 1, the silver cathode electrode is first coated on a glass substrate. Then, carbon nanotubes are deposited on the cathode electrode as...
Summary form only given. Large-scale flower-like TiO2 nanostructures with diameter about 300 nm were synthesized via a simple solution route at a near room temperature. The samples characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution electron microscopy (HRTEM). The results show that the flower-like nanostructures...
In this paper, individual molybdenum nanotip electrical properties and field emission are studied. Molybdenum nanotips are synthesis on stainless steel substrate by the method of thermal vapor deposition in a chamber with the vacuum of 7 Pa and are characterized by SEM, TEM and EDS.
This paper discusses about testing of pumping speed. A sputtering ion pump consists basically of two electrodes, anode and cathode, and a magnet. The method for testing pumping speed is called dynamic flow conductance.
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