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Electrical Characterization Of Carbon Nanotube As Gas Sensing Element

Gas sensing is very important in order to detect dangerous gases like carbon dioxide, ammonia and acetylene, which are commonly used in industries as well as in medical applications. Carbon Nanotube is a promising candidate for gas sensing element because of their large surface area. Therefore, they...

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Main Author: Mohd Yusof, Farah Aniza
Format: Thesis
Language:English
English
Published: 2007
Online Access:http://psasir.upm.edu.my/id/eprint/5245/1/FK_2007_45a.pdf
http://psasir.upm.edu.my/id/eprint/5245/
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spelling my.upm.eprints.52452013-05-27T07:21:26Z http://psasir.upm.edu.my/id/eprint/5245/ Electrical Characterization Of Carbon Nanotube As Gas Sensing Element Mohd Yusof, Farah Aniza Gas sensing is very important in order to detect dangerous gases like carbon dioxide, ammonia and acetylene, which are commonly used in industries as well as in medical applications. Carbon Nanotube is a promising candidate for gas sensing element because of their large surface area. Therefore, they offer excellent sensitivity and rapid response towards surface changes. This work aims to investigate carbon nanotubes as gas sensing element. The growth of carbon nanotube has been done using Chemical Vapor Deposition (CVD) technique. The physical and electrical characteristics of carbon nanotube have been characterized using microscopes and source measurement unit. Sensors were fabricated and the variations of electrical resistance upon the exposure of carbon dioxide, ammonia and acetylene gas have been investigated. The technique for growing carbon nanotubes that is called Floating Catalyst CVD has been used to produce grams of carbon nanotube. The temperature was set from 800oC to 900oC. For that range of temperature, grams of carbon nanotubes are produced in which the diameter is from 40 nm – 200nm and the length is in micrometer. The carbon nanotubes produced are found to have multi-layered wall in about 8nm thickness. The diameter, length and wall thickness have been measured using the Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM) and Transmission Electron Microscope (TEM). The multi-layered wall indicates that the carbon nanotubes are Multi-Walled Carbon Nanotubes (MWNTs). Gas-sensing samples have been prepared in the forms of pellet and films. Upon exposure of carbon dioxide, ammonia and acetylene gas, the resistance of the samples increases from their steady state value. From the research, it was found that the sensor is sensitive to carbon dioxide, ammonia and acetylene gas. The sensor can be operated at room temperature with response time as fast as 0.1 to 1 second. 2007 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/5245/1/FK_2007_45a.pdf Mohd Yusof, Farah Aniza (2007) Electrical Characterization Of Carbon Nanotube As Gas Sensing Element. Masters thesis, Universiti Putra Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description Gas sensing is very important in order to detect dangerous gases like carbon dioxide, ammonia and acetylene, which are commonly used in industries as well as in medical applications. Carbon Nanotube is a promising candidate for gas sensing element because of their large surface area. Therefore, they offer excellent sensitivity and rapid response towards surface changes. This work aims to investigate carbon nanotubes as gas sensing element. The growth of carbon nanotube has been done using Chemical Vapor Deposition (CVD) technique. The physical and electrical characteristics of carbon nanotube have been characterized using microscopes and source measurement unit. Sensors were fabricated and the variations of electrical resistance upon the exposure of carbon dioxide, ammonia and acetylene gas have been investigated. The technique for growing carbon nanotubes that is called Floating Catalyst CVD has been used to produce grams of carbon nanotube. The temperature was set from 800oC to 900oC. For that range of temperature, grams of carbon nanotubes are produced in which the diameter is from 40 nm – 200nm and the length is in micrometer. The carbon nanotubes produced are found to have multi-layered wall in about 8nm thickness. The diameter, length and wall thickness have been measured using the Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM) and Transmission Electron Microscope (TEM). The multi-layered wall indicates that the carbon nanotubes are Multi-Walled Carbon Nanotubes (MWNTs). Gas-sensing samples have been prepared in the forms of pellet and films. Upon exposure of carbon dioxide, ammonia and acetylene gas, the resistance of the samples increases from their steady state value. From the research, it was found that the sensor is sensitive to carbon dioxide, ammonia and acetylene gas. The sensor can be operated at room temperature with response time as fast as 0.1 to 1 second.
format Thesis
author Mohd Yusof, Farah Aniza
spellingShingle Mohd Yusof, Farah Aniza
Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
author_facet Mohd Yusof, Farah Aniza
author_sort Mohd Yusof, Farah Aniza
title Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
title_short Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
title_full Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
title_fullStr Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
title_full_unstemmed Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
title_sort electrical characterization of carbon nanotube as gas sensing element
publishDate 2007
url http://psasir.upm.edu.my/id/eprint/5245/1/FK_2007_45a.pdf
http://psasir.upm.edu.my/id/eprint/5245/
_version_ 1643823132746711040
score 13.211869

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