Application of carboxylated carbon nanotubes in gas sensing

This project aim to increase on the sensitivity of carboxylated CNTs based devices to gases with different concentration of nitric acid used. In this project, 2 method of deposition the CNTs onto the subsrate are carried. They are the thermal Chemical Vapor Deposition method and the drop-cast met...

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Main Author: Kwan, Ronnie Kwok Hoong.
Other Authors: Alfred Tok Iing Yoong
Format: Final Year Project
Language:English
Published: 2010
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Online Access:http://hdl.handle.net/10356/36169
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-361692023-03-04T15:40:34Z Application of carboxylated carbon nanotubes in gas sensing Kwan, Ronnie Kwok Hoong. Alfred Tok Iing Yoong School of Materials Science and Engineering DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Nanotechnology This project aim to increase on the sensitivity of carboxylated CNTs based devices to gases with different concentration of nitric acid used. In this project, 2 method of deposition the CNTs onto the subsrate are carried. They are the thermal Chemical Vapor Deposition method and the drop-cast method. The CNTs involved in this project are carboxylated with nitric acid at 1M, 2M and 4M. The procedures involved to carboxylate the CNTs are illustrated at the experimental procedure in this report. The receptors fabricated in this project are used as gas detecting agents for NO and CO gases in the laboratory. Gas sensing procedures are carried out using a Keithley 4200 probe station which is installed within a gas chamber in the polymer electronics laboratory at School of Materials Science and Engineering. Results have shown that the sensitivity of carboxylated CNTs varies with the concentration of nitric acid used to carboxylate the CNTs. The sensitivity towards NO gas is optimum with 2M of nitric acid. The positive result shown was tested by carboxylated CNTs that were deposited by the thermal Chemical Vapor Deposition method. It is reported by T. Ueda that temporal change rate of the resistance was proportional to the concentration of the targeted gas for multi-wall CNTs based sensors prepared by thermal Chemical Vapor Deposition method. [1] Though by varying the operating temperature is one of the ways to increase the sensitivity, the high temperature environment required makes it unrealistic for field deployment usage. In this project, the result realizes the possibility of future field deployment usage of CNTs as the sensitivity of gas sensor can be increase by varying the acid concentration to the CNTs. Future research work can be carried in this direction to develop a high performance gas receptor that is able to show high sensitivities, high stability and high selectivity that can distinguish more variety of gases. Bachelor of Engineering (Materials Engineering) 2010-04-23T03:24:33Z 2010-04-23T03:24:33Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/36169 en Nanyang Technological University 48 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Engineering::Nanotechnology
spellingShingle DRNTU::Engineering::Materials::Nanostructured materials
DRNTU::Engineering::Nanotechnology
Kwan, Ronnie Kwok Hoong.
Application of carboxylated carbon nanotubes in gas sensing
description This project aim to increase on the sensitivity of carboxylated CNTs based devices to gases with different concentration of nitric acid used. In this project, 2 method of deposition the CNTs onto the subsrate are carried. They are the thermal Chemical Vapor Deposition method and the drop-cast method. The CNTs involved in this project are carboxylated with nitric acid at 1M, 2M and 4M. The procedures involved to carboxylate the CNTs are illustrated at the experimental procedure in this report. The receptors fabricated in this project are used as gas detecting agents for NO and CO gases in the laboratory. Gas sensing procedures are carried out using a Keithley 4200 probe station which is installed within a gas chamber in the polymer electronics laboratory at School of Materials Science and Engineering. Results have shown that the sensitivity of carboxylated CNTs varies with the concentration of nitric acid used to carboxylate the CNTs. The sensitivity towards NO gas is optimum with 2M of nitric acid. The positive result shown was tested by carboxylated CNTs that were deposited by the thermal Chemical Vapor Deposition method. It is reported by T. Ueda that temporal change rate of the resistance was proportional to the concentration of the targeted gas for multi-wall CNTs based sensors prepared by thermal Chemical Vapor Deposition method. [1] Though by varying the operating temperature is one of the ways to increase the sensitivity, the high temperature environment required makes it unrealistic for field deployment usage. In this project, the result realizes the possibility of future field deployment usage of CNTs as the sensitivity of gas sensor can be increase by varying the acid concentration to the CNTs. Future research work can be carried in this direction to develop a high performance gas receptor that is able to show high sensitivities, high stability and high selectivity that can distinguish more variety of gases.
author2 Alfred Tok Iing Yoong
author_facet Alfred Tok Iing Yoong
Kwan, Ronnie Kwok Hoong.
format Final Year Project
author Kwan, Ronnie Kwok Hoong.
author_sort Kwan, Ronnie Kwok Hoong.
title Application of carboxylated carbon nanotubes in gas sensing
title_short Application of carboxylated carbon nanotubes in gas sensing
title_full Application of carboxylated carbon nanotubes in gas sensing
title_fullStr Application of carboxylated carbon nanotubes in gas sensing
title_full_unstemmed Application of carboxylated carbon nanotubes in gas sensing
title_sort application of carboxylated carbon nanotubes in gas sensing
publishDate 2010
url http://hdl.handle.net/10356/36169
_version_ 1759856209921310720