Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine

A sensitive, flexible and convenient electrochemical method for the determination of dopamine (DA) was developed using an aligned carbon nanotube (CNT) sheet electrode. The electrochemical behaviour of DA at the aligned CNT sheet electrode was investigated by cyclic voltammetry (CV) and differential...

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Main Author: Soh, Janice Wan Qi.
Other Authors: Zheng Lianxi
Format: Final Year Project
Language:English
Published: 2013
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Online Access:http://hdl.handle.net/10356/54024
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-540242023-03-04T18:26:38Z Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine Soh, Janice Wan Qi. Zheng Lianxi School of Mechanical and Aerospace Engineering DRNTU::Engineering::Nanotechnology A sensitive, flexible and convenient electrochemical method for the determination of dopamine (DA) was developed using an aligned carbon nanotube (CNT) sheet electrode. The electrochemical behaviour of DA at the aligned CNT sheet electrode was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) with three parameters which are the scan rate of CV, the pH values of phosphate buffer solution (PBS) solution and the concentration of DA. The results of cyclic and differential pulse voltammetric investigations showed that the aligned CNT sheet electrode has an efficient electrocatalytic activity for the electrochemical oxidation of DA. The aligned CNT sheet displays linear behaviour with the square root of scan rates over the 0.01 to 0.5 V/s range. With an increase in pH value, the DA oxidation peak potential shifted negatively. In addition, the aligned CNT sheet was observed to show higher sensitivity to lower concentration compared to higher concentration of DA. The oxidation peak current of DA at the modified electrode was linear to the lower and higher concentration of DA from 1 to 120 μM, with correlation coefficient of 0.998 for both and detection limit of 0.1 μM. A reproducible response was observed for repetitive measurements with a RSD of less than 5%. The aligned CNT sheet electrode also showed flexibility and pre-treatment was not required. These studies show that aligned CNT sheet electrodes can be used with fast scanning techniques and are advantageous due to their good sensitivity, reproducibility, conductivity, flexibility and convenience. Bachelor of Engineering (Mechanical Engineering) 2013-06-11T08:33:37Z 2013-06-11T08:33:37Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/54024 en Nanyang Technological University 75 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::Nanotechnology
spellingShingle DRNTU::Engineering::Nanotechnology
Soh, Janice Wan Qi.
Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
description A sensitive, flexible and convenient electrochemical method for the determination of dopamine (DA) was developed using an aligned carbon nanotube (CNT) sheet electrode. The electrochemical behaviour of DA at the aligned CNT sheet electrode was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) with three parameters which are the scan rate of CV, the pH values of phosphate buffer solution (PBS) solution and the concentration of DA. The results of cyclic and differential pulse voltammetric investigations showed that the aligned CNT sheet electrode has an efficient electrocatalytic activity for the electrochemical oxidation of DA. The aligned CNT sheet displays linear behaviour with the square root of scan rates over the 0.01 to 0.5 V/s range. With an increase in pH value, the DA oxidation peak potential shifted negatively. In addition, the aligned CNT sheet was observed to show higher sensitivity to lower concentration compared to higher concentration of DA. The oxidation peak current of DA at the modified electrode was linear to the lower and higher concentration of DA from 1 to 120 μM, with correlation coefficient of 0.998 for both and detection limit of 0.1 μM. A reproducible response was observed for repetitive measurements with a RSD of less than 5%. The aligned CNT sheet electrode also showed flexibility and pre-treatment was not required. These studies show that aligned CNT sheet electrodes can be used with fast scanning techniques and are advantageous due to their good sensitivity, reproducibility, conductivity, flexibility and convenience.
author2 Zheng Lianxi
author_facet Zheng Lianxi
Soh, Janice Wan Qi.
format Final Year Project
author Soh, Janice Wan Qi.
author_sort Soh, Janice Wan Qi.
title Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
title_short Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
title_full Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
title_fullStr Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
title_full_unstemmed Preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
title_sort preparation and characterization of aligned carbon nanotube sheet for electrochemical detection of dopamine
publishDate 2013
url http://hdl.handle.net/10356/54024
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