The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A novel method for fabricating a small-sized carbon nanotube (CNT) emitter was developed. The emitter was fabricated by contacting the tungsten probe covered with CNT paste to the surface of Kovar rod, and then the brightness of electron beam generated from the CNT paste emitter was measured. We obtained the virtual source size of 1.13 × 10−10 m2 and the brightness of 1.2 × 107 A m−2sr−1 at an applied...
In this paper, optical performance of CFEs fabricated from carbon nanotubes and tungsten single crystal is presented. A cold field emitter (CFE) source, which operates at room temperatures or lower, is shown to have better performance over the high temperature Schottky emitter source. Electron emission mainly due to electron tunneling at low temperatures in the cold field emission mode offers a low...
Field emission micro-focus X-ray source based on carbon nanotube (CNT) has attractive features for biomedical or clinical imaging. X-ray sources for micro-focus and/or miniature tube types require a mini-sized, high-density emission current in the order of 102~103 mA/cm2. We have previously reported that the optimized paste composition with a nano-scale metal filler enhanced adhesion between CNT emitter...
Summary form only given. Carbon nanotubes (CNTs) are candidate for ideal electron field emitters due to their high aspect ratio, superior electrical and thermal conductivity, and relatively high chemical and mechanical stability. Recently, they have been extensively used for high current density emitters of X-ray tubes and THz imaging source to overcome the limitation of thermionic emitters such as...
In this paper, novel top branched carbon nanotube (TBCNT) were discovered by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). This new kind TBCNT was grown directly on tungsten wire by pyrolysis of FePc. At 1123 K FePc can be decompounded into C, Fe and other elements, the deposition site of C atom was calculated when FePc be decompound in test, and the growth of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.