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

2013 ◽  
Vol 113 (2) ◽  
pp. 023302 ◽  
Author(s):  
Salman Mahmood ◽  
Zainal Arif Burhanudin ◽  
Aysha Salman
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Field Emission ◽  
Emission Model ◽  
Gas Breakdown

Field Emission Model of CNT Based Ionization Gas Sensor

2013 ◽  
Vol 667 ◽  
pp. 135-143 ◽  
Author(s):  
Salman Mahmood ◽  
Zainal Arif Burhanudin ◽  
Nor Hisham Hamid
Keyword(s):  
Gas Sensor ◽  
Field Emission ◽  
Gas Detection ◽  
Electron Field Emission ◽  
Emission Model ◽  
Detection Mechanism ◽  
New Model ◽  
Particle In Cell ◽  
Order Of Magnitude ◽  
Electron Field

A new model to study the gas detection mechanism of carbon nanotube (CNT) based ionization gas sensor has been developed. The model incorporates the effect of electron field emission due to the presence of CNT. The model is then embedded in the standard Particle-In-Cell / Monte-Carlo-Collision (PIC-MCC) codes. This enhanced PIC-MCC codes serve as a tool to optimize CNT based ionization gas sensor. The functionality of the new model is validated by running simulations of DC discharges in argon and comparing the results with published experimental and simulated works. From the simulation, one order of magnitude decrease in the breakdown voltages and three orders of magnitude faster response time was observed.

Universal field-emission model for carbon nanotubes on a metal tip

2002 ◽  
Vol 80 (3) ◽  
pp. 506-508 ◽  
Author(s):  
D. Y. Zhong ◽  
G. Y. Zhang ◽  
S. Liu ◽  
T. Sakurai ◽  
E. G. Wang
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Emission Model ◽  
Metal Tip

Carbon Nanotube Gas Sensor Fabricated on Anodic Aluminum Oxide

2007 ◽  
Vol 124-126 ◽  
pp. 1309-1312
Author(s):  
Nguyen Duc Hoa ◽  
Nguyen Van Quy ◽  
Gyu Seok Choi ◽  
You Suk Cho ◽  
Se Young Jeong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Gas Sensor ◽  
Chemical Vapor ◽  
Fast Response ◽  
Device Fabrication ◽  
Alumina Oxide ◽  
Response And Recovery ◽  
New Type ◽  
P Type

A new type of gas sensor was realized by directly depositing carbon nanotube on nano channels of the anodic alumina oxide (AAO) fabricated on p-type silicon substrate. The carbon nanotubes were synthesized by thermal chemical vapor deposition at a very high temperature of 1200 oC to improve the crystallinity. The device fabrication process was also developed. The contact of carbon nanotubes and p-type Si substrate showed a Schottky behavior, and the Schottky barrier height increased with exposure to gases while the overall conductivity decreased. The sensors showed fast response and recovery to ammonia gas upon the filling (400 mTorr) and evacuation.

Effect of adsorbates on field emission from flame-synthesized carbon nanotubes

2008 ◽  
Vol 41 (19) ◽  
pp. 195401 ◽  
Author(s):  
Chun Li ◽  
Guojia Fang ◽  
Xiaoxia Yang ◽  
Nishuang Liu ◽  
Yuping Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission

Analytic theory for field emission driven microscale gas breakdown for a pin-to-plate geometry

2021 ◽  
Vol 129 (10) ◽  
pp. 103301 ◽  
Author(s):  
Amanda M. Loveless ◽  
Lorin I. Breen ◽  
Allen L. Garner
Keyword(s):  
Field Emission ◽  
Analytic Theory ◽  
Gas Breakdown ◽  
Plate Geometry
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