Title :
Effects of CNT density variation in field emission model of ionization gas sensor
Author :
Mahmood, Salman ; Burhanudin, Zainal Arif ; Hamid, Nor Hisham
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. Teknol. PETRONAS (UTP), Tronoh, Malaysia
Abstract :
A new model to study the gas detection mechanism of carbon nanotube (CNT) based ionization gas sensor has been developed. The model incorporates electron field emission property of the CNTs. The CNT density and aspect ratio variations which are major factors involved in the field emission are also included. The CNT field emission is controlled with density and aspect ratio parameters in the model. The model is then embedded in the standard Particle-In-Cell / Monte-Carlo-Collision (PIC-MCC) codes. With the help of these enhanced PIC-MCC codes the simulation of gas breakdown behaviour with CNT field emission and density variation effects become possible for the first time. From the simulations, it is observed that the electrostatic screening effects are reduced and the field emission is high for the moderate CNT density on the electrode.
Keywords :
Monte Carlo methods; carbon nanotubes; electric breakdown; electron field emission; electrostatics; field ionisation; gas sensors; nanosensors; nanotube devices; CNT density variation; CNT field emission; Monte Carlo Collision code; PIC-MCC code; aspect ratio parameter; aspect ratio variation; carbon nanotube based ionization gas sensor; density variation effect; electron field emission model; electrostatic screening effect; gas breakdown behaviour; gas detection mechanism; standard particle-in-cell code; Carbon nanotubes; Computational modeling; Electric breakdown; Electrodes; Electrostatics; Gas detectors; Ionization;
Conference_Titel :
Micro and Nanoelectronics (RSM), 2011 IEEE Regional Symposium on
Conference_Location :
Kota Kinabalu
Print_ISBN :
978-1-61284-844-0
DOI :
10.1109/RSM.2011.6088340
