Stabilizing a pulsed field emission from an array of carbon nanotubes
In this paper, we propose a new design configuration for a carbon nanotube (CNT) array based pulsed field emission device to stabilize the field emission current. In the new design, we consider a pointed height distribution of the carbon nanotube array under a diode configuration with two side gat...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
The International Society for Optical Engineering
2010
|
| Online Access: | http://hdl.handle.net/1721.1/52732 |
| _version_ | 1826204065030209536 |
|---|---|
| author | Sinha, Niraj Melnik, R. V. N. Anand, Sushant Mahapatra, D. Roy |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Sinha, Niraj Melnik, R. V. N. Anand, Sushant Mahapatra, D. Roy |
| author_sort | Sinha, Niraj |
| collection | MIT |
| description | In this paper, we propose a new design configuration for a carbon nanotube (CNT) array based pulsed field emission device to stabilize the field emission current. In the new design, we consider a pointed height distribution of the carbon nanotube array under a diode configuration with two side gates maintained at a negative potential to obtain a highly intense beam of electrons localized at the center of the array. The randomly oriented CNTs are assumed to be grown on a metallic substrate in the form of a thin film. A model of field emission from an array of CNTs under diode configuration was proposed and validated by experiments. Despite high output, the current in such a thin film device often decays drastically. The present paper is focused on understanding this problem. The random orientation of the CNTs and the electromechanical interaction are modeled to explain the self-assembly. The degraded state of the CNTs and the electromechanical force are employed to update the orientation of the CNTs. Pulsed field emission current at the device scale is finally obtained by using the Fowler-Nordheim equation by considering a dynamic electric field across the cathode and the anode and integration of current densities over the computational cell surfaces on the anode side. Furthermore we compare the subsequent performance of the pointed array with the conventionally used random and uniform arrays and show that the proposed design outperforms the conventional designs by several orders of magnitude. Based on the developed model, numerical simulations aimed at understanding the effects of various geometric parameters and their statistical features on the device current history are reported. |
| first_indexed | 2024-09-23T12:48:21Z |
| format | Article |
| id | mit-1721.1/52732 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:48:21Z |
| publishDate | 2010 |
| publisher | The International Society for Optical Engineering |
| record_format | dspace |
| spelling | mit-1721.1/527322022-09-28T10:09:16Z Stabilizing a pulsed field emission from an array of carbon nanotubes Sinha, Niraj Melnik, R. V. N. Anand, Sushant Mahapatra, D. Roy Massachusetts Institute of Technology. Department of Mechanical Engineering Sinha, Niraj Sinha, Niraj In this paper, we propose a new design configuration for a carbon nanotube (CNT) array based pulsed field emission device to stabilize the field emission current. In the new design, we consider a pointed height distribution of the carbon nanotube array under a diode configuration with two side gates maintained at a negative potential to obtain a highly intense beam of electrons localized at the center of the array. The randomly oriented CNTs are assumed to be grown on a metallic substrate in the form of a thin film. A model of field emission from an array of CNTs under diode configuration was proposed and validated by experiments. Despite high output, the current in such a thin film device often decays drastically. The present paper is focused on understanding this problem. The random orientation of the CNTs and the electromechanical interaction are modeled to explain the self-assembly. The degraded state of the CNTs and the electromechanical force are employed to update the orientation of the CNTs. Pulsed field emission current at the device scale is finally obtained by using the Fowler-Nordheim equation by considering a dynamic electric field across the cathode and the anode and integration of current densities over the computational cell surfaces on the anode side. Furthermore we compare the subsequent performance of the pointed array with the conventionally used random and uniform arrays and show that the proposed design outperforms the conventional designs by several orders of magnitude. Based on the developed model, numerical simulations aimed at understanding the effects of various geometric parameters and their statistical features on the device current history are reported. 2010-03-18T20:13:23Z 2010-03-18T20:13:23Z 2009-08 Article http://purl.org/eprint/type/JournalArticle 0277-786X http://hdl.handle.net/1721.1/52732 Mahapatra, D. Roy et al. “Stabilizing a pulsed field emission from an array of carbon nanotubes.” Carbon Nanotubes, Graphene, and Associated Devices II. Ed. Manijeh Razeghi, Didier Pribat, & Young-Hee Lee. San Diego, CA, USA: SPIE, 2009. 73990M-10. © 2009 SPIE--The International Society for Optical Engineering en_US http://dx.doi.org/10.1117/12.826166 Proceedings of SPIE Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf The International Society for Optical Engineering SPIE |
| spellingShingle | Sinha, Niraj Melnik, R. V. N. Anand, Sushant Mahapatra, D. Roy Stabilizing a pulsed field emission from an array of carbon nanotubes |
| title | Stabilizing a pulsed field emission from an array of carbon nanotubes |
| title_full | Stabilizing a pulsed field emission from an array of carbon nanotubes |
| title_fullStr | Stabilizing a pulsed field emission from an array of carbon nanotubes |
| title_full_unstemmed | Stabilizing a pulsed field emission from an array of carbon nanotubes |
| title_short | Stabilizing a pulsed field emission from an array of carbon nanotubes |
| title_sort | stabilizing a pulsed field emission from an array of carbon nanotubes |
| url | http://hdl.handle.net/1721.1/52732 |
| work_keys_str_mv | AT sinhaniraj stabilizingapulsedfieldemissionfromanarrayofcarbonnanotubes AT melnikrvn stabilizingapulsedfieldemissionfromanarrayofcarbonnanotubes AT anandsushant stabilizingapulsedfieldemissionfromanarrayofcarbonnanotubes AT mahapatradroy stabilizingapulsedfieldemissionfromanarrayofcarbonnanotubes |