Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy

Metal nanoparticles possess great optical properties, among many others, and are used in multiple applications. One of the most important application is the enhancement of the Raman scattering signals, which on its own is known to be too weak to be measured. However, surface-enhanced Raman scatterin...

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Main Author: Amirah Nur Izzaty Bakram
Other Authors: Duan Hongwei
Format: Final Year Project
Language:English
Published: 2019
Subjects:
Online Access:http://hdl.handle.net/10356/78525
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-785252023-03-03T15:37:19Z Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy Amirah Nur Izzaty Bakram Duan Hongwei School of Chemical and Biomedical Engineering DRNTU::Engineering::Bioengineering Metal nanoparticles possess great optical properties, among many others, and are used in multiple applications. One of the most important application is the enhancement of the Raman scattering signals, which on its own is known to be too weak to be measured. However, surface-enhanced Raman scattering (SERS) often comes from the aggregates of metal nanoparticles that are not homogenous, causing some signals to be strong and others weak. In this project, a method on how to make the SERS signals homogenous is implemented through the fabrication of 2D-assembly of the metal nanoparticles as SERS substrates. Different types of nanoparticles are synthesized from gold seeds, mainly, gold nanorods, gold nano-octahedra, silver-coated nanorods and silver-coated nanocubes. They are first surface-modified by polydopamine (PDA) and then undergo self-assembly at the water-oil interface. After transferred to a glass substrate, the SERS activity was measured with Rhodamine B as the Raman dye. Our results have showed that the self- assembled SERS substrates are able to provide relatively uniform enhancement factors. Bachelor of Engineering (Bioengineering) 2019-06-21T02:36:18Z 2019-06-21T02:36:18Z 2019 Final Year Project (FYP) http://hdl.handle.net/10356/78525 en Nanyang Technological University 42 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::Bioengineering
spellingShingle DRNTU::Engineering::Bioengineering
Amirah Nur Izzaty Bakram
Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy
description Metal nanoparticles possess great optical properties, among many others, and are used in multiple applications. One of the most important application is the enhancement of the Raman scattering signals, which on its own is known to be too weak to be measured. However, surface-enhanced Raman scattering (SERS) often comes from the aggregates of metal nanoparticles that are not homogenous, causing some signals to be strong and others weak. In this project, a method on how to make the SERS signals homogenous is implemented through the fabrication of 2D-assembly of the metal nanoparticles as SERS substrates. Different types of nanoparticles are synthesized from gold seeds, mainly, gold nanorods, gold nano-octahedra, silver-coated nanorods and silver-coated nanocubes. They are first surface-modified by polydopamine (PDA) and then undergo self-assembly at the water-oil interface. After transferred to a glass substrate, the SERS activity was measured with Rhodamine B as the Raman dye. Our results have showed that the self- assembled SERS substrates are able to provide relatively uniform enhancement factors.
author2 Duan Hongwei
author_facet Duan Hongwei
Amirah Nur Izzaty Bakram
format Final Year Project
author Amirah Nur Izzaty Bakram
author_sort Amirah Nur Izzaty Bakram
title Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy
title_short Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy
title_full Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy
title_fullStr Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy
title_full_unstemmed Interfacial assembly of metal nanoparticles for surface enhanced Raman spectroscopy
title_sort interfacial assembly of metal nanoparticles for surface enhanced raman spectroscopy
publishDate 2019
url http://hdl.handle.net/10356/78525
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