- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - CNT field emitter based high performance x-ray source
摘要： We fabricated the cold cathode x-ray source composed of point-type CNT field emitter, mesh gate electrode, e-beam focusing lens and W anode. The point-type CNT field emitter was made by CNT film with a triangular tip shape. Field emission properties measured in triode configuration showed the low turn-on and threshold electric fields, the high emission current and focused electron beam spot. The CNT field emitter based cold cathode x-ray source reveals high resolution x-ray images. We demonstrated that the point-type CNT emitter is suitable candidate for the high performance cold cathode x-ray sources.
关键词： cold cathode x-ray source,triode structure,field emission,carbon nanotube filed emitter
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - New applications for ultra-high brightness LaB<inf>6</inf> nanowire cathode
摘要： Electron microscopy is probably the most demanding application for a high brightness electron source. This is because the electromagnetic lens is with both chromatic and spherical aberrations. Those lens imperfections put limits on the focusable electrons, which are required to, as much as possible, originate from a small area before spreading over a small angle as per unit velocity. Brightness and energy spread, two quantities closely related to such requirements, are therefore most important in predicting an achievable resolution for an electron optical system. A third crucial factor is stability, a general requirement from the perspective of commercial instruments, which must deliver guarantee-able performance in a repeatable manner. This work will introduce a nano-emitter which prevails over current electron sources in respect of the above-mentioned three qualities.
关键词： electron microscopy,EELS,field emission
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - FEM and FIM of Graphene: Possible Observation of Electronic States at Edges
摘要： Field emission microscopy images of a graphene edge show a striped pattern (or “lip pattern”) consisting of an array of streaked spots; the direction of striation is perpendicular to the graphene sheet, and each stripe is divided into two wings by a central dark band running parallel to the graphene sheet. The “lip pattern” reflects the spatial distribution of pi-orbitals at the graphene edge. Field ion microscopy of graphene edge also exhibits an array of paired spots with higher resolution than FEM patterns. Preliminary results on measure spin polarization of electrons field-emitted from graphene edges are also carried out, showing the spin polarization of 20 to 25% at room temperature.
关键词： spin polarization,field emission,graphene
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Fabrication of stable carbon nanotube cold cathode electron emitters with electrical aging
摘要： We studied on the fabrication and improved field emission properties of carbon nanotube (CNT) cold cathode electron emitters with electrical aging. Our CNT field emitters have improved electron emission properties with thermal and electrical aging. For the set-up of electrical aging, we used bias voltage at Joule heating appeared. Our CNT emitters show increases of electron emission at initial stage of aging and then saturation of emission current. With the electrical aging, we obtained enhanced electron emission from 3 mA to 5.5 mA and long- time stable operation.
关键词： Field emission,Carbon nanotubes,Electrical aging,Annealing
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Field Emission Properties of Indium-Doped ZnO Nanowires Prepared on ITO Glass Substrate
摘要： Doping is an important approach for improving the field emission properties of semiconductor nanowire field emitters. The indium-doped zinc oxide nanowires were prepared on ITO glass substrate by thermal oxidation method and field emission properties were measured. The prepared In-doped nanowire arrays shows excellent field emission performance with a turn-on field of 4.0 V/μm and current fluctuation of ~1.4%.
关键词： field emission,ZnO nanowire,indium doped
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Improved Multiscale Model of Heat Exchange at the Apex of Carbon Nanotube Fiber Cathodes
摘要： A multiscale model of field emission (FE) from carbon nanotube fibers (CNFs) is developed which includes a detailed treatment of the heat exchange mechanisms in the array of carbon nanotubes (CNTs) located at the tip of the fiber. The model takes into account Joule heating within the fiber, radiative cooling at the fiber apex, and the transition from Nottingham heating to Henderson cooling in the CNTs in the array at the apex of the fiber as the external electric field is increased. The model uses numerical calculations of the current emitted from each CNT and the energy exchange at their tips. The model predicts the fraction of CNTs being destroyed as a function of the applied external electric field. For the surviving CNTs, the model also predicts the fraction of CNTs either undergoing Henderson cooling or Nottingham heating for both the up and down sweeps of the applied external electrical field. This investigation sheds new light on the FE properties on CNFs.
关键词： carbon nanotube fibers,Multiscale Model,field emission,Henderson cooling,self-heating effects,Nottingham heating
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Interface Control for Enhancing Field Emission Properties from Single-Crystalline Molybdenum Nanopyramid Emitters
摘要： Interface control is an effective way to improve the field emission performance for an existing cold cathode. In this study, a series of pre- and post-treatments have been carried out to reduce the thickness of mid-layer, from over 30 nm to 3 nm, for the single-crystalline molybdenum nanopyramid emitters. Consequently, enhanced field emission properties have been achieved.
关键词： Molybdenum nanopyramid,Single crystalline,Field emission,Interface control
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - peration of a Carbon Nanotube Field-Emission Cathode in Low Earth Orbit
摘要： A carbon nanotube-based field emission cathode (FEC) has been researched and developed by the Japan Aerospace Exploration Agency mainly for space debris removal systems with electrodynamic tether (EDT) propulsion. An in- orbit experiment to demonstrate the EDT technologies including the FEC was planned and conducted in early 2017. The FEC operated well without any critical trouble during the one-week mission period. The data obtained includes its electron emission capability to space plasma and its durability in low Earth orbit, which suggest the prospect of using the FEC in space.
关键词： in-orbit experiment,electrodynamic tether,field emission cathode,carbon nanotube,space debris
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Field Emission Properties of a Single Silicon Carbide Nanowire
摘要： A single silicon Carbide(SiC) nanowire was fixed on the tungsten tip by using an electron beam induced deposition technique. The field emission properties of single SiC nanowire driven by DC and pulse have been characterized separately. The results show that the pulse-driven field emission performance of single SiC nanowire is better than the one driven by DC, including the turn-on voltage and the maximum current. An inference is proposed to qualitatively explain the improvement of field emission performance, which assumes the changes of work function on the top of single SiC nanowire due to the different stretching effect of the electrostatic field by two driving mode.
关键词： silicon carbide,in-situ measurement,field emission,pulse driving mode
更新于2025-09-23 15:21:21
-
[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - The experiment study of double grid to enhance electron transmission in field emission
摘要： The high electrons interception rate of grid in field emission will lead to gas desorption, cathode emission drop, grid deformation,short circuit and so on which will greatly affect the reliability of the device. In this paper, the double grid structure is used to improve the electronic transmission of the grid. The experimental results show that the electron transmission can be improved effectively.
关键词： electron transmission,field emission
更新于2025-09-23 15:21:21