Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah

In this study, a novel fibre optic sensor towards biosensing application was developed by introducing polymeric supporting membranes of hybrid hydrogels (HH) and nanomaterials of graphene quantum dots (GQDs) as coating materials. HH was formed by introducing chitosan (CH) as an additive that would f...

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Main Author:	Noor Akashah, Muhammad Haziq
Format:	Thesis
Language:	English
Published:	2022
Subjects:	Bioengineering Optical fiber detectors
Online Access:	https://ir.uitm.edu.my/id/eprint/75724/1/75724.pdf
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id	my-uitm-ir.75724
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spelling	my-uitm-ir.757242023-03-30T13:28:36Z Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah 2022 Noor Akashah, Muhammad Haziq Bioengineering Optical fiber detectors In this study, a novel fibre optic sensor towards biosensing application was developed by introducing polymeric supporting membranes of hybrid hydrogels (HH) and nanomaterials of graphene quantum dots (GQDs) as coating materials. HH was formed by introducing chitosan (CH) as an additive that would further aid in introducing the amide group that was lacking in agarose (AG) hydrogel. GQDs were synthesised using a chemical reduction method transforming the precursor graphene oxide (GO) into GQDs nanostructures. GO was synthesised prior to that using a modified Hummers' method. GQDs were optimised by varying the parameters in the chemical reduction method with the optimum condition for synthesis ~2 nm of GQDs was obtained by using 25 uL of dispersed in 5 mL of sulfuric acid, 0.014 g of potassium permanganate and 0.1 mL of hydrogen peroxide. The optimum GQDs were found to be having an average size of 2.481 ± 0.649 nm as confirmed by transmission electron microscopy, subtle x-ray diffraction peak at around 29=26°, loaded with hydroxyl (OH), carbonyl (C=0) and carbon bonds found from Fourier transform infrared analysis reflect that GQDs have many oxygenated functional groups making them soluble in water and stable fluorescence stability for up to 90 days with a quantum yield of 48%. A conventional fibre optic cable was used and exposed its core region made from silica by using mechanical etching via a fibre optic cable stripper. Before that, signal validation for the uncladded region (1, 2 and 3 cm) was performed with 2 cm of uncladded and was found to give the signal of 1660.74 a.u. and efficient uncladded length to be spliced. The fibre optic core coated HH was then let to be coated with the optimum coating thickness of HH on fibre optic was found at 122.18 ± 0.3 um by 2% total concentration of HH (2% w/v of AG with 2% v/v of CH) with confirmation by signal validation from the spectrometer with laser as a light source. 2022 Thesis https://ir.uitm.edu.my/id/eprint/75724/ https://ir.uitm.edu.my/id/eprint/75724/1/75724.pdf text en public masters Universiti Teknologi MARA (UiTM) College of Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Bioengineering Optical fiber detectors
spellingShingle	Bioengineering Optical fiber detectors Noor Akashah, Muhammad Haziq Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah
description	In this study, a novel fibre optic sensor towards biosensing application was developed by introducing polymeric supporting membranes of hybrid hydrogels (HH) and nanomaterials of graphene quantum dots (GQDs) as coating materials. HH was formed by introducing chitosan (CH) as an additive that would further aid in introducing the amide group that was lacking in agarose (AG) hydrogel. GQDs were synthesised using a chemical reduction method transforming the precursor graphene oxide (GO) into GQDs nanostructures. GO was synthesised prior to that using a modified Hummers' method. GQDs were optimised by varying the parameters in the chemical reduction method with the optimum condition for synthesis ~2 nm of GQDs was obtained by using 25 uL of dispersed in 5 mL of sulfuric acid, 0.014 g of potassium permanganate and 0.1 mL of hydrogen peroxide. The optimum GQDs were found to be having an average size of 2.481 ± 0.649 nm as confirmed by transmission electron microscopy, subtle x-ray diffraction peak at around 29=26°, loaded with hydroxyl (OH), carbonyl (C=0) and carbon bonds found from Fourier transform infrared analysis reflect that GQDs have many oxygenated functional groups making them soluble in water and stable fluorescence stability for up to 90 days with a quantum yield of 48%. A conventional fibre optic cable was used and exposed its core region made from silica by using mechanical etching via a fibre optic cable stripper. Before that, signal validation for the uncladded region (1, 2 and 3 cm) was performed with 2 cm of uncladded and was found to give the signal of 1660.74 a.u. and efficient uncladded length to be spliced. The fibre optic core coated HH was then let to be coated with the optimum coating thickness of HH on fibre optic was found at 122.18 ± 0.3 um by 2% total concentration of HH (2% w/v of AG with 2% v/v of CH) with confirmation by signal validation from the spectrometer with laser as a light source.
format	Thesis
qualification_level	Master's degree
author	Noor Akashah, Muhammad Haziq
author_facet	Noor Akashah, Muhammad Haziq
author_sort	Noor Akashah, Muhammad Haziq
title	Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah
title_short	Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah
title_full	Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah
title_fullStr	Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah
title_full_unstemmed	Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah
title_sort	synthesis of 3d hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / muhammad haziq noor akashah
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	College of Engineering
publishDate	2022
url	https://ir.uitm.edu.my/id/eprint/75724/1/75724.pdf
_version_	1783736076054036480

Synthesis of 3D hydrogel graphene quantum dots nanocomposites modified fibre optic for biosensors application / Muhammad Haziq Noor Akashah

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