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Field emission model of carbon nanotubes to simulate gas breakdown in ionization gas sensor

Mahmood, Salman and Burhanudin, Zainal Arif and Salman, Aysha (2013) Field emission model of carbon nanotubes to simulate gas breakdown in ionization gas sensor. JOURNAL OF APPLIED PHYSICS, 113 (2). 023302-1. ISSN 0021-8979

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Official URL: http://jap.aip.org/resource/1/japiau/v113/i2/p0233...

Abstract

A new field emission model of carbon nanotubes (CNTs) to simulate gas detection mechanism in CNT based ionization gas sensor has been developed. The new model consists of three modules which are combined together and embedded in the standard particle-in-cell/Monte Carlo collision codes. The functionality of the enhanced model is checked by varying the gas pressure and gap spacing in the simulations. From the results, around one order of magnitude decrease in the breakdown voltages and two orders of magnitude faster response time is observed. The lowest breakdown voltages are observed when intertube spacing is equal to height of the nanotube. The field enhancement factor 9 is calculated from our model and compared with the 9 of the well established model. The closeness among the values of 9 validates the performance of our field emission model. Furthermore, the 9 of our model is compared with the 9 of the existing ionization gas sensors. It was found that the 9 of our sensor is around 3 times better than the 9 of the gold nanowire based ionization gas sensor and 28 times better than the 9 of the other CNT based ionization gas sensor. These results suggest that by properly controlling the growth of CNT structures, an optimized CNT based ionization gas sensor can be realized.

Item Type:Article
Impact Factor:2.169 from 2011 Journal of Citation Report (Thomson Reuters)
Subjects:Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Academic Subject One:Academic Department - Electrical And Electronics - Pervasisve Systems - Microelectronics - Material Development - CNT
Departments / MOR / COE:Mission Oriented Research > Nanotechnology
ID Code:8843
Deposited By: Dr Zainal Arif Burhanudin
Deposited On:16 Jan 2013 02:07
Last Modified:16 Jan 2013 02:07

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