Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection

Chlorothalonil-based fungicide has been employed extensively to prevent various fungal diseases in plants to increase yield of crops. Conversely, over-usage of chlorothalonil can have adverse effects to human health and environment. An optical sensor implemented Localized Surface Plasmon Reson...

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Main Author:	Razali, Nur Liyana
Format:	Thesis
Language:	English English English
Published:	2020
Subjects:	QK Botany
Online Access:	http://eprints.uthm.edu.my/1120/1/24p%20NUR%20LIYANA%20RAZALI.pdf http://eprints.uthm.edu.my/1120/2/NUR%20LIYANA%20RAZALI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1120/3/NUR%20LIYANA%20RAZALI%20WATERMARK.pdf
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spelling	my-uthm-ep.11202021-09-22T05:57:29Z Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection 2020-07 Razali, Nur Liyana QK Botany Chlorothalonil-based fungicide has been employed extensively to prevent various fungal diseases in plants to increase yield of crops. Conversely, over-usage of chlorothalonil can have adverse effects to human health and environment. An optical sensor implemented Localized Surface Plasmon Resonance (LSPR) phenomenon offers direct and simple detection method has been developed for chlorothalonil detection. In this study, a simple technique of seed-mediated growth method (SMGM) has been successfully performed to grow gold nanoparticles (GNPs) onto solid substrates. The process parameters; seeding time, growth time and effect of capping agent’s molecular weight were investigated to monitor the effect on nanoparticles formation. It was found that increasing the seeding time affect the surface density of GNPs. Furthermore, the investigation on growth time shows significant impact to the shape and size of nanoparticles with 2 hours growth time formed small particles whiles 5 hours and more produces bigger particles. Moreover, in this work, molecular weight (MW) of polyvinylpyrrolidone (PVP) as shape controlling agent was also investigated to observe the uniformity of nanoparticles. PVP 55,000 produced more uniform shape and size of gold nanoparticles compared to PVP 40,000. The prepared sample with 3 hours seeding time, 8 hours growth time and 55k MW of PVP produced highest surface density of GNPs which is 53.66 ± 1.23 %. This sample was further used as a sensing material in detection of chlorothalonil. The sensitivity of the sensor system is determined by measuring the change of peak position and intensity on t-SPR and l�SPR band of GNPs in three mediums; air, deionized water and chlorothalonil solution. Chlorothalonil with 30 mM concentration (without GNPs) exhibits no significant peak and thus proven that GNPs is more suitable to be used as sensing material. Besides, GNPs shows good stability response in 600 seconds with fast response and recovery time during five cycles change of medium. As a conclusion, the GNPs was successfully synthesised and used as sensing material for chlorothalonil detection from 1mM to 40 mM. 2020-07 Thesis http://eprints.uthm.edu.my/1120/ http://eprints.uthm.edu.my/1120/1/24p%20NUR%20LIYANA%20RAZALI.pdf text en public http://eprints.uthm.edu.my/1120/2/NUR%20LIYANA%20RAZALI%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/1120/3/NUR%20LIYANA%20RAZALI%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	QK Botany
spellingShingle	QK Botany Razali, Nur Liyana Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
description	Chlorothalonil-based fungicide has been employed extensively to prevent various fungal diseases in plants to increase yield of crops. Conversely, over-usage of chlorothalonil can have adverse effects to human health and environment. An optical sensor implemented Localized Surface Plasmon Resonance (LSPR) phenomenon offers direct and simple detection method has been developed for chlorothalonil detection. In this study, a simple technique of seed-mediated growth method (SMGM) has been successfully performed to grow gold nanoparticles (GNPs) onto solid substrates. The process parameters; seeding time, growth time and effect of capping agent’s molecular weight were investigated to monitor the effect on nanoparticles formation. It was found that increasing the seeding time affect the surface density of GNPs. Furthermore, the investigation on growth time shows significant impact to the shape and size of nanoparticles with 2 hours growth time formed small particles whiles 5 hours and more produces bigger particles. Moreover, in this work, molecular weight (MW) of polyvinylpyrrolidone (PVP) as shape controlling agent was also investigated to observe the uniformity of nanoparticles. PVP 55,000 produced more uniform shape and size of gold nanoparticles compared to PVP 40,000. The prepared sample with 3 hours seeding time, 8 hours growth time and 55k MW of PVP produced highest surface density of GNPs which is 53.66 ± 1.23 %. This sample was further used as a sensing material in detection of chlorothalonil. The sensitivity of the sensor system is determined by measuring the change of peak position and intensity on t-SPR and l�SPR band of GNPs in three mediums; air, deionized water and chlorothalonil solution. Chlorothalonil with 30 mM concentration (without GNPs) exhibits no significant peak and thus proven that GNPs is more suitable to be used as sensing material. Besides, GNPs shows good stability response in 600 seconds with fast response and recovery time during five cycles change of medium. As a conclusion, the GNPs was successfully synthesised and used as sensing material for chlorothalonil detection from 1mM to 40 mM.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Razali, Nur Liyana
author_facet	Razali, Nur Liyana
author_sort	Razali, Nur Liyana
title	Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
title_short	Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
title_full	Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
title_fullStr	Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
title_full_unstemmed	Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
title_sort	study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2020
url	http://eprints.uthm.edu.my/1120/1/24p%20NUR%20LIYANA%20RAZALI.pdf http://eprints.uthm.edu.my/1120/2/NUR%20LIYANA%20RAZALI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1120/3/NUR%20LIYANA%20RAZALI%20WATERMARK.pdf
_version_	1747830741011529728

Study on the properties of gold nanoparticles as plasmonic sensing material for chlorothalonil detection

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