Modeling and simulation for the field emission of carbon nanotubes array

Wang, X.Q.; Wang, M.; Ge, Hui; Chen, Q.; Xu, Yanqiao

doi:10.1016/j.physe.2005.07.012

Cited by 44 publications

(21 citation statements)

References 20 publications

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“…The enhancement factor is very depended on the aspect ratio and shape of the nanowires tips as well as the interspace distances between the nanowires. The effects of these structural parameters on the induced local electric fields between the two parallel plates were studied by these authors and reported previously [22][23][24][25][26][27][28][29][30][31]. Devices were designed considering gold, silver, and semiconductor ZnO as the materials for the nanowires.…”

Section: Simulation Resultsmentioning

confidence: 99%

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

Chivu

Kahrizi

2012

2012 IEEE International Conference on Industrial Technology

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Gas ionization sensor (GIS), made of two parallel plates, works on measuring the breakdown voltage of gases that is unique for each gas. The gas breakdown inside the gas chamber occurs due to the ionization of gas molecules by accelerated electron impacts. The acceleration of electrons is very depended on the effective electric field they experience. It is shown that metallic or semiconductor nanowires grown between the two plates improve the sensitivity of the device and breakdown voltages of the gases are considerably reduced. In this work we report the design, modeling, and simulation of a miniaturized GIS based on nanowires. We have developed simulating software based on an open source simulator XOOPIC. The simulation tool is based on combined Particle-In-Cell and Monte-Carlo-Collision approaches. The tool is developed to model and simulate the gas ionization sensor to detect various gases including greenhouse gases with optimized breakdown voltages.

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Section: Simulation Resultsmentioning

confidence: 99%

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

Chivu

Kahrizi

2012

2012 IEEE International Conference on Industrial Technology

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“…Calculation difficulties in these numerical methods arise due to the large nanotube aspect ratio and very long distance between cathode and anode in comparison with emitter height. Usually, these numerical results were generalized and simple fitting formulas of field enhancement factor for individual nanotube (Edgcombe & Valdrè, 2001;Edgcombe & Valdrè, 2002;Shang et al, 2007), for nanotube in space between parallel cathode and anode planes (Bonard et al, 2002a;Filip et al, 2001;Nilsson et al, 2002;Smith et al, 2005), and for a nanotube surrounded by neighboring nanotubes with a screening effect (Jo et al, 2003;Glukhova et al, 2003;Nilsson et al, 2000;Wang et al, 2005) were suggested. The main problem for such algebraic fitting formulas is the lack of a definitive proof of their accuracy.…”

Section: Electric Field and Field Enhancement Factor In Diode Configumentioning

confidence: 99%

Carbon Nanotube Field Emitters

Zhbanov¹,

Pogorelov²,

Chang³

2010

Carbon Nanotubes

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“…When the distance between adjacent patterns of synthesizing CNFs is at least twice the CNF length, they found that the field strength focused on those CNFs was almost the same as a CNF standing alone. There are many reports on the optimization of FE properties with CNF array patterning that followed the reports of Nilsson et al [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In some these reports, the patterning of CNFs by lithography, which commonly uses semiconductor process technology, was explained.…”

Section: Introductionmentioning

confidence: 99%

Optimized Distribution and Morphology of Carbon Nanofibers for a Field Emitter Grown by Nickel and Chromium Cosputtering

Shimoi¹,

Tanaka²

2013

MSA

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To obtain a high field emission (FE) current with a low driving voltage, it is important to control and optimize carbon nanofiber (CNF) array patterns for FE. While there have been various means for controlling CNF array patterns reported over the past few decades, array patterning using lithography is the method typically used to control CNF morphology. Because lithography uses many masks and is costly, it is necessary to establish a simpler process. In this study, the grain size and distribution of catalysts with phase separation were controlled. A system which controls the morphology of small bundles of CNFs was constructed with the distance between the bundles kept constant in order to obtain a higher FE current. The Ni catalyst layer for forming the CNF morphology was separated by noncatalytic Cr grains formed by cosputtering. As a result, it was possible to control the Ni content, the grain size and synthesis density of CNFs in the alloy with a varying number of nickel pellets placed on the chromium target. This method is an epochmaking CNF patterning technique very different from lithography.

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Modeling and simulation for the field emission of carbon nanotubes array

Cited by 44 publications

References 20 publications

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

Design, modeling and simulation of a miniaturized gas ionization sensor: Optimization of the structure and operation

Carbon Nanotube Field Emitters

Optimized Distribution and Morphology of Carbon Nanofibers for a Field Emitter Grown by Nickel and Chromium Cosputtering

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