Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm

Oil palms suffer from the major disease, basal stem rot (BSR), caused by the white rot fungus Ganoderma. During the plant-pathogen interactions, secondary metabolites are secreted by plants as defence mechanism. Various types of secondary metabolites secreted being quinoline compound as one of them....

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Main Author:	Abdul Rahim, Zulaiha
Format:	Thesis
Language:	English
Published:	2018
Subjects:	Electrodes Carbon nanotubes Quinoline
Online Access:	http://psasir.upm.edu.my/id/eprint/85423/1/FS%202018%20111%20ir.pdf
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id	my-upm-ir.85423
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spelling	my-upm-ir.854232021-12-16T03:39:46Z Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm 2018-04 Abdul Rahim, Zulaiha Oil palms suffer from the major disease, basal stem rot (BSR), caused by the white rot fungus Ganoderma. During the plant-pathogen interactions, secondary metabolites are secreted by plants as defence mechanism. Various types of secondary metabolites secreted being quinoline compound as one of them. A rapid electrochemical technique is developed in order to help in early detection of the disease before the loss of the oil palm plantations. Multiwalled carbon nanotube screen-printed electrode based on Silicon substrate was fabricated for electrochemical sensor. The sensor was applied for the detection of quinoline via linear sweep voltammetry approach. Preliminary study of the growth of multi-wall carbon nanotube (MWCNT) was done using plasma enhanced chemical vapour deposition (PECVD) techniques. Posttreatment of MWCNT using different kinds of plasma atmosphere including oxygen, hydrogen and nitrogen were applied to introduce defects on the surface of MWCNTs and nitrogen plasma gives the most significant arises on the peak current compared to the bare electrode with increment from ~0.33 mA to ~0.52 mA with increased of effective area from ~0.32 cm2 to ~0.49 cm2. The study was further into fabrication of screen-printed electrode system using photolithography methods and the MWCNTs working electrodes were modified under nitrogen plasma to enhance the surface sensitivity. The study was extended into detection of quinoline in secondary metabolite. In pH 7 phosphate buffer saline, an oxidation peak of quinoline was observed. Compared with the unmodified electrode, the NH3-MWCNT modified electrode greatly increases the oxidation peak current of quinoline showing notable enhancement effect. The effects of pH value, amount of MWCNT, accumulation potential and time were studied on the oxidation peak current of quinoline. A detection limit of 0.164μM was also achieved by applying deposition potential of -0.6V and deposition time of 50s. Preliminary study on root extract was done by diluting the extract on 0.1M methanol solution in addition of 0.1M PBS (pH 7) as supporting electrolyte. The linear plot gives an equation of y= 0.4753x-2.2894 with R2= 0.9879. Electrodes Carbon nanotubes Quinoline 2018-04 Thesis http://psasir.upm.edu.my/id/eprint/85423/ http://psasir.upm.edu.my/id/eprint/85423/1/FS%202018%20111%20ir.pdf text en public masters Universiti Putra Malaysia Electrodes Carbon nanotubes Quinoline Yusof, Nor Azah
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Yusof, Nor Azah
topic	Electrodes Carbon nanotubes Quinoline
spellingShingle	Electrodes Carbon nanotubes Quinoline Abdul Rahim, Zulaiha Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
description	Oil palms suffer from the major disease, basal stem rot (BSR), caused by the white rot fungus Ganoderma. During the plant-pathogen interactions, secondary metabolites are secreted by plants as defence mechanism. Various types of secondary metabolites secreted being quinoline compound as one of them. A rapid electrochemical technique is developed in order to help in early detection of the disease before the loss of the oil palm plantations. Multiwalled carbon nanotube screen-printed electrode based on Silicon substrate was fabricated for electrochemical sensor. The sensor was applied for the detection of quinoline via linear sweep voltammetry approach. Preliminary study of the growth of multi-wall carbon nanotube (MWCNT) was done using plasma enhanced chemical vapour deposition (PECVD) techniques. Posttreatment of MWCNT using different kinds of plasma atmosphere including oxygen, hydrogen and nitrogen were applied to introduce defects on the surface of MWCNTs and nitrogen plasma gives the most significant arises on the peak current compared to the bare electrode with increment from ~0.33 mA to ~0.52 mA with increased of effective area from ~0.32 cm2 to ~0.49 cm2. The study was further into fabrication of screen-printed electrode system using photolithography methods and the MWCNTs working electrodes were modified under nitrogen plasma to enhance the surface sensitivity. The study was extended into detection of quinoline in secondary metabolite. In pH 7 phosphate buffer saline, an oxidation peak of quinoline was observed. Compared with the unmodified electrode, the NH3-MWCNT modified electrode greatly increases the oxidation peak current of quinoline showing notable enhancement effect. The effects of pH value, amount of MWCNT, accumulation potential and time were studied on the oxidation peak current of quinoline. A detection limit of 0.164μM was also achieved by applying deposition potential of -0.6V and deposition time of 50s. Preliminary study on root extract was done by diluting the extract on 0.1M methanol solution in addition of 0.1M PBS (pH 7) as supporting electrolyte. The linear plot gives an equation of y= 0.4753x-2.2894 with R2= 0.9879.
format	Thesis
qualification_level	Master's degree
author	Abdul Rahim, Zulaiha
author_facet	Abdul Rahim, Zulaiha
author_sort	Abdul Rahim, Zulaiha
title	Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
title_short	Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
title_full	Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
title_fullStr	Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
title_full_unstemmed	Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
title_sort	fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm
granting_institution	Universiti Putra Malaysia
publishDate	2018
url	http://psasir.upm.edu.my/id/eprint/85423/1/FS%202018%20111%20ir.pdf
_version_	1747813539098132480

Fabrication of plasma-treated multiwalled carbon nanotube electrodes for detection of quinoline in infected oil palm

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