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In this paper, we present the development of CNT based Field Emitter arrays by Electrophoresis method using CsI as surface modifying element. The electron emission increased as well as the turn on field reduced to greater extent. When compared to cathode of same dimensions without cesium iodide, the emission current increased 7 times with the field 3 times less. From the Fowler-Nordheim plots a reduction...
A local heating chemical vapor deposition method is used to synthesize carbon nanotubes onto a metal substrate. Compared with normal thermal chemical vapor deposition, this method can provide faster growth rate, more nodes can be formed onto the carbon nanotubes, and emission sites can be increased largely. A maximum current over 100 mA was obtained from carbon nanotubes emitter layer with emission...
A novel sealing structure is proposed to make in situ measurement of pressure for nondestructive. A small gauge, consisting of a cathode (carbon nanotubes field emitter arrays), a grid, and a collector, is sealed together with FEDs. The gauge is analogous to a conventional hot cathode ionization gauge but has a cold cathode (CNT). This gauge is calibrated in an ultra-high vacuum (UHV) system with...
At present carbon nanotubes (CNT) are the most prospective cathode material for triode applications because of their strong field emission (FE) at low electric fields. The FE homogeneity of flat CNT cathodes, however, is still limited by their rather fast and uncontrolled growth which usually leads to strongly varying field enhancement and current carrying capability of the individual emitters. Therefore,...
Single-wall carbon nanotubes (SWNT) filled with fullerene (Ceo) were discovered by Smith et al. [1] and synthesized in vacuum. The peapod have attracted much attention due to unique properties as a new carbon related material in recently decade. These 'peapods' generally occur as highly ordered long chains with the same ~10 A intermolecular spacing as in the fee solid. Cgo is a strong electrophile,...
In this work, we report results showing a correlation between the curvature of PDMS-supported CNT-tip arrays and their emission properties. CNTs were produced by using a hot-filament chemical-vapor-deposition (HFCVD) setup. VA-CNTs were synthesized using 28-Torr mixtures of methane (20 SCCM) and hydrogen (30 SCCM) as feedstock. Temperatures of filaments and substrates were 2050 and 750 degC, respectively...
In recent, field emission lamp (FEL) with carbon nanotube (CNT) field emitters was intensively studied for a high performance back light unit (BLU) in LCD. The CNT-FEL can give a local dimming BLU increasing contrast ratio, reducing motion blur and saving power consumption. The local FE blocks, in general, are arranged in a matrix format and addressed by voltage pulse signals. In this method the row...
Summary form only given. We present the development of a plasma-enhanced chemical vapor deposition (PECVD) system for deposition of multi-walled, vertically aligned Carbon Nano-Tubes (CNT) as cathode field emitter sites in a large (1000 x 1000), 1 cm2 area array. The CNT deposition is compatible with the use of Si wafers containing the individual emitter site ballasts in the form of Si n-type JFETs...
We introduce a novel geometry carbon nanotube field emitter array capable of achieving high current densities. Arrays of patterned vertically aligned CNT bundles, with an open center similar to the structure of a donut, was grown directly on bulk metallic substrates. This new carbon nanotube structure, with larger edge area for enhanced edge effect, reached current densities as high as 60 mA/cm2 at...
Field emitter arrays (FEAs) need improved novel cold cathode materials for better and more reliable performance. The presence of negative electron affinity (NEA) on hydrogen-terminated diamond surfaces, coupled with practical chemical vapor deposition (CVD) processing of deposited diamond as a thin film on a variety of substrates, has promoted further interest in the use of diamond and diamond-like...
A new field emission pressure sensor based on carbon nanotubes (CNTs) emitting array is described in this paper. The pressure sensor is based on the principle that the field emission current is correlated with the electrical field intensity, i.e. the variable anode-emitter distance caused by pressure changes when the applied voltage is fixed. The sensor consists of two main parts, silicon etched membrane...
The following topics are dealt: vacuum nanoelectronics; carbon nanotube field emitter array applications; field emission cathode; field emission display; field emission mechanism characterisation; photoemission theory; ZnO nanostructured materials; novel emitter materials; XPS characterisation; field emission triode and MEMS.
Carbon nanotube (CNT) field emission cathodes suffer from electric field screening effect arising from densely packed CNTS, resulting in a lower current density. To solve this problem, CNTS have to be separated in a proper manner. One way is to use electron beam lithographic method to produce single CNT arrays. Previously, we have fabricated gated field emission arrays with single CNT emitters by...
The effects of field emission cycles applied on the screen printed carbon nanotube (CNT) cold cathode were studied. CNT emitters were vertically well aligned and the emission images were visibly improved after the field treatment. The mechanism of the treatment was investigated using scanning electron microscopy. The mechanism may involve the erasion of hot spot and alignment of CNT
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