Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.

Nano-sized carbons such as graphene and carbon nanotubes have been used as highly sensitive semiconducting materials in field effect transistor (FET) based biosensors. Extensive studies have been made for each carbon material for biosensing but only a few ventures into a comparison study. For thi...

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Main Author: Hoo, Tun Kai.
Other Authors: Chen Peng
Format: Final Year Project
Language:English
Published: 2010
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Online Access:http://hdl.handle.net/10356/39852
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-398522023-03-03T15:38:55Z Comparative study of graphene and carbon nanotube based field effect transistor for biosensing. Hoo, Tun Kai. Chen Peng School of Chemical and Biomedical Engineering DRNTU::Engineering::Chemical engineering::Biotechnology Nano-sized carbons such as graphene and carbon nanotubes have been used as highly sensitive semiconducting materials in field effect transistor (FET) based biosensors. Extensive studies have been made for each carbon material for biosensing but only a few ventures into a comparison study. For this project, a top-gating FET design was utilized to measure the bio-analytes’ modulation of the graphene and carbon nanotubes’ conductance. The device was fabricated using a micro-molding in capillary technique (MIMIC) to form micro-patterned graphene and carbon nanotubes devices for biosensing. The dimension of the micro-pattern improves compatibility with cell biosensing and it introduces an efficient electron transport pathway for better device conductance. The target analytes for this project were dopamine molecules and mercury (II) nitrate ions, which were added in increasing concentrations into a phosphate buffered saline (PBS) buffer solution filled FET device. Results from dopamine testing have shown that FET devices using carbon nanotubes possess superior sensitivity and detection range compared to graphene FET devices due to several explanations proposed. However, the detection results for charged ions (from mercury (II) nitrate) by both devices were debatable due to a lack of understanding of adsorption mechanism. Further studies can be done to remedy the above issue and specific binding of the analytes to functionalized devices can be carried out for a more thorough comparative study. Bachelor of Engineering (Chemical and Biomolecular Engineering) 2010-06-07T04:24:21Z 2010-06-07T04:24:21Z 2010 2010 Final Year Project (FYP) http://hdl.handle.net/10356/39852 en Nanyang Technological University 66 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::Chemical engineering::Biotechnology
spellingShingle DRNTU::Engineering::Chemical engineering::Biotechnology
Hoo, Tun Kai.
Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
description Nano-sized carbons such as graphene and carbon nanotubes have been used as highly sensitive semiconducting materials in field effect transistor (FET) based biosensors. Extensive studies have been made for each carbon material for biosensing but only a few ventures into a comparison study. For this project, a top-gating FET design was utilized to measure the bio-analytes’ modulation of the graphene and carbon nanotubes’ conductance. The device was fabricated using a micro-molding in capillary technique (MIMIC) to form micro-patterned graphene and carbon nanotubes devices for biosensing. The dimension of the micro-pattern improves compatibility with cell biosensing and it introduces an efficient electron transport pathway for better device conductance. The target analytes for this project were dopamine molecules and mercury (II) nitrate ions, which were added in increasing concentrations into a phosphate buffered saline (PBS) buffer solution filled FET device. Results from dopamine testing have shown that FET devices using carbon nanotubes possess superior sensitivity and detection range compared to graphene FET devices due to several explanations proposed. However, the detection results for charged ions (from mercury (II) nitrate) by both devices were debatable due to a lack of understanding of adsorption mechanism. Further studies can be done to remedy the above issue and specific binding of the analytes to functionalized devices can be carried out for a more thorough comparative study.
author2 Chen Peng
author_facet Chen Peng
Hoo, Tun Kai.
format Final Year Project
author Hoo, Tun Kai.
author_sort Hoo, Tun Kai.
title Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
title_short Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
title_full Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
title_fullStr Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
title_full_unstemmed Comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
title_sort comparative study of graphene and carbon nanotube based field effect transistor for biosensing.
publishDate 2010
url http://hdl.handle.net/10356/39852
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