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
Subjects:	Carbon Electric engineering
Online Access:	http://psasir.upm.edu.my/id/eprint/5245/1/FK_2007_45a.pdf
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spelling	my-upm-ir.52452013-05-27T07:21:26Z Electrical Characterization Of Carbon Nanotube As Gas Sensing Element 2007 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. Carbon Electric engineering 2007 Thesis http://psasir.upm.edu.my/id/eprint/5245/ http://psasir.upm.edu.my/id/eprint/5245/1/FK_2007_45a.pdf application/pdf en public masters Universiti Putra Malaysia Carbon Electric engineering Faculty of Engineering English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Carbon Electric engineering
spellingShingle	Carbon Electric engineering Mohd Yusof, Farah Aniza Electrical Characterization Of Carbon Nanotube As Gas Sensing Element
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
qualification_level	Master's degree
author	Mohd Yusof, Farah Aniza
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
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	2007
url	http://psasir.upm.edu.my/id/eprint/5245/1/FK_2007_45a.pdf
_version_	1747810382680948736

Electrical Characterization Of Carbon Nanotube As Gas Sensing Element

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