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2005 International Vacuum Nanoelectronics Conference最新文献

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Field electron emission from a film of carbon nanopearls 碳纳米珠薄膜的场电子发射
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619583
R. Mouton, V. Semet, D. Guillot, V. Binh
Layers of non-directional carbon nanotubes (CNTs) are currently used as field emission (FE) cathodes. The main advantage for such cathodes is the low cost fabrication process using conventional film deposition techniques such as screen-printing or imprint. This advantage is unfortunately counter-balanced by the non-uniformity and low density of the field emission sites, a consequence of its mat-like deposition and the tubular geometry of the CNTs. Recently, by a chemical vapour deposition (CVD) technique, strings of nanoballs of carbon are obtained which are called carbon nanopearls. Due to its string-like structure of nanospheres, the deposited layers of the carbon nanopearls naturally present a higher density of field emission sites. As the nanopearls surface is constituted of graphene, as the carbon nanotubes apex, these field emission sites exhibit the same quality for current stability as observed with the carbon nanotubes. It has been demonstrated that a film of conditioned carbon nanopearls exhibits Fowler-Nordheim field emission behaviour, with currents of up to 50 muA readily obtainable under continuous emission in moderate vacuum. Compared to other graphitic nanostructures, in particular the tubular geometry of CNTs, the nanopearls have the advantage of presenting statistically a high density of apex areas with a small radius of curvature (~75 nm) when deposited on a planar surface. Moreover, these spheres are composed of graphitic flakes that are unclosed at the surface and therefore believed to exhibit many dangling bonds with the potential to enhance the field emission current. These two properties give the nanopearls excellent prospects as a cathode material. To investigate the field emission properties, the nanopearls were directly grown on the end of a metallic wire. The field emission was performed in a conventional field emission microscope environment, with the cathode located a few mm away from a flat screen. Systematic analysis of the field emission properties and behaviour of carbon nanopearls based cathodes were done, in particular the energy distribution measurements under different conditions. A comparative analysis with carbon nanotubes will point out the specific quality related to the nanopearl structure
非定向碳纳米管(CNTs)层目前被用作场发射(FE)阴极。这种阴极的主要优点是使用丝网印刷或压印等传统薄膜沉积技术的低成本制造过程。不幸的是,这种优势被场发射位点的不均匀性和低密度所抵消,这是其席状沉积和CNTs管状几何形状的结果。近年来,利用化学气相沉积(CVD)技术制备出了碳纳米球串,称为碳纳米珠。由于碳纳米珠的弦状结构,其沉积层自然具有较高的场发射位点密度。由于纳米珠表面由石墨烯构成,作为碳纳米管的顶点,这些场发射位点表现出与碳纳米管相同的电流稳定性。研究表明,条件碳纳米珠薄膜表现出福勒-诺德海姆场发射行为,在中等真空条件下,连续发射电流可达50 μ a。与其他石墨纳米结构相比,特别是与管状几何的碳纳米管相比,纳米珠具有统计学上的优势,当沉积在平面表面时,其尖端区域密度高,曲率半径小(~75 nm)。此外,这些球体由石墨薄片组成,石墨薄片在表面不闭合,因此被认为具有许多悬垂键,具有增强场发射电流的潜力。这两个特性使得纳米珠作为正极材料具有良好的前景。为了研究其场发射特性,将纳米珠直接生长在金属丝的末端。在传统的场发射显微镜环境中进行场发射,阴极位于距离平面屏幕几毫米的地方。系统地分析了碳纳米珠基阴极的场发射特性和行为,特别是在不同条件下的能量分布测量。通过与碳纳米管的对比分析,可以指出与纳米颗粒结构相关的具体质量
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引用次数: 1
Alternative field electron emission characteristics from graphite-insulator composite layers 石墨-绝缘体复合层的可选场电子发射特性
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619621
M. Waite, H. Bishop, M. Brierly, R. A. Tuck, W. Taylor
A novel type of emitter for a FED, the pFED is being developed for the past ten years. This emitter is formed from micron-sized silica coated with a nano-scale silica insulator. Of the commercially available graphites tested, the best performance was obtained from a 6 mum grade material. When printing such a material a coverage of ~15% cannot be exceeded without forming large clusters that disrupt subsequent processing, thus limiting the density of potential emission sites. In addition, many flakes lie flat on the surface and are unlikely to contribute to emission. In order to improve the density of emitters a thick ink approach has been investigated where the flakes are supported in a mixture of nanoparticle silica (or other insulating particles such as TiO2 or Al2O3) and submicron graphite. The resulting structure is some 1-2 mum thick with the graphite flakes and the underlying cathode connected by a semi-resistive pathway of conducting and insulating particles. The emission properties of these thick inks were comparable with those of the thin inks except that in some cases a second type of emission (Type II emission) was observed
pFED是一种新型的发射体,是近十年来不断发展起来的。该发射极由微米级的二氧化硅制成,表面涂有纳米级的二氧化硅绝缘体。在测试的市售石墨中,性能最好的是6 mum级材料。当打印这种材料时,不能超过~15%的覆盖率,否则会形成大的簇,破坏后续加工,从而限制潜在排放点的密度。此外,许多薄片平躺在表面上,不太可能造成排放。为了提高发射体的密度,研究人员研究了一种厚墨方法,在这种方法中,薄片被纳米二氧化硅(或其他绝缘颗粒,如TiO2或Al2O3)和亚微米石墨的混合物所支撑。所得到的结构约为1-2微米厚,石墨薄片和下面的阴极通过导电和绝缘颗粒的半电阻通路连接。除了在某些情况下观察到第二种类型的发射(II型发射)外,这些厚油墨的发射性质与薄油墨的发射性质相当
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引用次数: 0
X-ray imaging detector silicon field emission tip array energy conversion x射线成像探测器硅场发射尖端阵列能量转换
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619480
Yu Wang, C. Hunt, Y. Diawara, T. Thorson
We present here an X-ray detector based on Si field-emission tip technology. The X-ray is first converted to EHPs in the substrate Si The electrons are emitted into vacuum from spatially-distinct nanoscale field emission tips fabricated on the back-side of the conversion layer, and detected using an imaging multi-channel plate (MCP).
本文介绍了一种基于Si场发射尖端技术的x射线探测器。x射线首先在衬底Si中转换为EHPs,电子从转换层背面制造的空间不同的纳米场发射尖端发射到真空中,并使用成像多通道板(MCP)检测。
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引用次数: 1
Fabrication and characterization of a micro-fabricated linear array of electrospray emitters intended for space thruster applications 用于空间推进器应用的微制造电喷雾发射器线性阵列的制造和表征
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619496
L. Velásquez-García, A. Akinwande, M. Martínez-Sánchez
This paper reports the design, fabrication, and experimental characterization of a microfabricated, internally-fed linear array of electrospray emitters intended for space propulsion applications. The engine uses highly doped formamide as propellant, with electrical conductivity in the 0.3 - 3.0 S/m range. The electrospray array operates in the single Taylor cone droplet emission regime, and it requires about 2000 V to become activated. The reported device demonstrates the feasibility of high clustering of the electrospray emitters.
本文报道了一种用于空间推进应用的微制造、内部馈电线性阵列电喷雾发射器的设计、制造和实验表征。发动机采用高度掺杂的甲酰胺作为推进剂,电导率在0.3 - 3.0 S/m范围内。电喷雾阵列在单泰勒锥液滴发射状态下工作,它需要大约2000伏才能被激活。该装置证明了高聚类电喷雾发射体的可行性。
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引用次数: 0
Theoretical analysis of triple junction field emission for a new type of cold cathode 新型冷阴极三结场发射的理论分析
Pub Date : 2005-07-10 DOI: 10.1116/1.2185650
M. Chung, T. S. Choi, P. H. Cutler, N. Miskovsky
Triple junction of metal-dielectric-vacuum is theoretically analysed. Electric field enhancement is observed in the vicinity of a metal-dielectric contact and considered to be due to the presence of dielectric. The dielectric enhancement in the problem gives rise to a new concept that dielectric can enhance the electric field, which is opposite to the usual view that dielectric reduces the electric field. This new type of enhancement is attributed to the polarization of dielectric. It is also found that the metal-dielectric-vacuum path is more favorable than the metal-vacuum path for field electrons. The present results suggest that the triple junction can be a new type of field emission source
对金属-介电-真空三重结进行了理论分析。在金属-电介质接触附近观察到电场增强,并认为是由于电介质的存在。问题中的介电增强提出了介电增强电场的新概念,这与通常认为介电减弱电场的观点相反。这种新型的增强归因于介质的极化。研究还发现,金属-介电-真空路径比金属-真空路径对场电子更有利。目前的结果表明,三重结可以作为一种新型的场发射源
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引用次数: 17
Emission mechanism for field assisted electron emission from a novel multilayered nanocarbon based electron emitter 一种新型多层纳米碳基电子发射器的场辅助电子发射机理
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619463
B. Satyanarayana
In an effort to develop a relatively low cost-low temperature process based technology compatible with semiconductor technology, a low field electron emission from a nanocarbon based multilayered electron emitter was studied. Some of the results are presented in this paper as well as a possible mechanism of emission from such multilayered electron emitter.
为了开发一种与半导体技术兼容的低成本低温工艺技术,研究了纳米碳基多层电子发射器的低场电子发射。本文给出了部分实验结果,并对多层电子发射器的可能发射机理进行了讨论。
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引用次数: 0
Fabrication and electron emission of carbon microtubes 碳微管的制备及电子发射
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619596
Wang Weibiao, Xia Yuxue, Lei Da, Chen Song, L. Lili, Chen Ming, L. Jingqiu
This study introduced a kind of carbon microtubes. These materials have some different properties with carbon nanotubes and the density is lower than carbon nanotube bundles. These carbon microtubes are directly synthesized by liquidoid epitaxy method on silicon substrates at low temperature. The field emission properties of carbon microtubes were also determined.
本研究介绍了一种碳微管。这些材料具有与碳纳米管不同的性能,且密度低于碳纳米管束。这些碳微管是在低温下用液态外延法直接在硅衬底上合成的。测定了碳微管的场发射性能。
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引用次数: 0
Mass spectrum analysis of a L.M.A.I.Ss using a novel software by MATLAB 利用MATLAB软件对l - m - a - is进行质谱分析
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619631
T. Ganetsos, Nikolaos Laskaris, Ch. Lontos, B. Kotsos
In this work, mass spectrum analysis using a new novel software by MATLAB were tested in several liquid metal ion sources (LMAISs) such as AuGeSi, GaIN, ErFeCrNi, and AuGe. The relative intensities of the main ions of each source were determined. In AuGeSi source our results strongly point towards the co-existence of two mechanisms for the emission of doubly-charged monomer ions: direct field evaporation for the Ge/sup 2+/ and Si/sup 2+/ ions but Au/sup 2+/ is formed by the post-ionisation of Au/sup +/. In ErFeCrNi source according to Brandon's criterion Er/sup 2+/, Fe/sup 2+/ is likely to be field evaporated as doubly charged ions. Also, in AuSi alloy source Si/sup 2+/ is directly field-evaporated while Au/sup 2+/ must formed by the post-ionisation of Au/sup +/.
在这项工作中,使用MATLAB的新型软件在几种液态金属离子源(lmais)中进行了质谱分析,如AuGeSi, GaIN, ErFeCrNi和AuGe。测定了各源主离子的相对强度。在AuGeSi源中,我们的结果强烈地指向了两种双重带电单体离子发射机制的共存:Ge/sup 2+/和Si/sup 2+/离子的直接场蒸发,而Au/sup 2+/是由Au/sup +/的后电离形成的。在ErFeCrNi源中,根据Brandon准则Er/sup 2+/, Fe/sup 2+/很可能以双带电离子的形式被场蒸发。此外,在AuSi合金中,源Si/sup 2+/是直接场蒸发的,而Au/sup 2+/必须由Au/sup +/后电离形成。
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引用次数: 0
Capacitance effect on FED system 电容对FED系统的影响
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619623
M. Xiaoyan, Lei Wei, Gu Wei, Zhang Xiaobing
This paper discusses the capacitance effect of the triode structure on the display characteristic of a field emission display. An RC circuit model between gate and cathode is adopted and results show that the effect of the capacitance and resistance on the waveform and the grayscale are estimated.
讨论了三极管结构的电容效应对场发射显示器显示特性的影响。采用栅极和阴极之间的RC电路模型,计算了电容和电阻对波形和灰度的影响。
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引用次数: 0
The influence of electric field and emission current on the configuration of nanotubes in carbon nanotubes layers 电场和发射电流对碳纳米管层中纳米管结构的影响
Pub Date : 2005-07-10 DOI: 10.1109/IVNC.2005.1619524
N. Kiselev, A. L. Musatov, J. Hutchison, O. Zhigalina, E. Kukovitskiǐ, V. Artemov, Y. Grigoriev, K. R. Izrael’yants, S. L’vov
Carbon nanotube (NT) layers grown by CVD on Ni foil demonstrated low voltage characteristics of field electron emission: the value of the field amplification coefficient beta was in the range 1000-4000. The influence of electric field (Eav), emission current (IFE ) and exposure time on the configuration of conical-layer carbon nanotubes grown by CVD on the edge of a Ni foil has been investigated. TEM profile imaging revealed a significant concentration of NTs close to the edge surface, whereas on the NTs layers' outer surfaces single, non-oriented NTs with open ends free of catalytic particles, were observed. After sufficient electric field application many NTs become oriented towards the anode, but one or two of them were always a few microns more extended. In-situ SEM investigation showed that below Eav = 3.2 - 3.9 V/mum, emission was achieved at the expense of originally existing free NTs ends. Configuration changes began at the higher applied fields. On the observed foil edge length (14.6 - 17.8 mum) and the edge thickness 200 mum one or two NTs extended towards the anode and probably become main emitters. On further increasing the field to Eav= 5.7 - 8 V/mum and at IFE=2times10-5 A these tubes disappeared (or essentially shortened). At Eav = 8 V/mum and higher, and at an exposure time of up to 40 min, several tens of extended NTs appeared with one or two extended significantly beyond the others. This NT configuration pattern is probably connected with electrostatic screening between the NTs. It is suggested that in the range of Eav and IFE that was investigated, a limited number of NTs were emitting and these nanotubes were constantly changing as Eav, IFE and exposure time increase
在Ni箔上CVD生长的碳纳米管(NT)层表现出低电压场电子发射特性,场放大系数β值在1000 ~ 4000之间。研究了电场(Eav)、发射电流(IFE)和曝光时间对镍箔边缘CVD生长的锥形层碳纳米管结构的影响。透射电镜成像显示,纳米碳管的边缘表面有大量的纳米碳管,而在纳米碳管层的外表面,则观察到单个的、无取向的、开放的、没有催化颗粒的纳米碳管。在足够的电场作用后,许多纳米管都朝向阳极,但其中一两个纳米管总是延伸几微米。原位SEM研究表明,当Eav = 3.2 - 3.9 V/mum时,以原有的自由NTs端为代价实现了发射。配置更改从较高的应用字段开始。在观察到的箔边缘长度(14.6 - 17.8 μ m)和边缘厚度为200 μ m的情况下,有一两个纳米管向阳极延伸,可能成为主发射体。当电场进一步增大到Eav= 5.7 - 8 V/mum, IFE=2times10- 5a时,这些管消失(或基本上缩短)。在Eav = 8 V/mum及更高时,曝光时间长达40 min,出现了数十个延长的nt,其中一个或两个明显超过其他nt。这种NT结构模式可能与NT之间的静电屏蔽有关。结果表明,在所研究的Eav和IFE范围内,随着Eav、IFE和暴露时间的增加,纳米管的发射数量有限,且不断发生变化
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引用次数: 0
期刊
2005 International Vacuum Nanoelectronics Conference
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