Synthesis of rare earth based nanomaterials

Discovered just a few years ago, graphene and graphene oxide has received great interest in the scientific community. Graphene oxide, being able to load and deliver drugs opens up possibilities for simultaneous bio-imaging and therapy. Meanwhile, in the near-infrared region, biological samples have...

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Main Author: Ong, Ling Hui.
Other Authors: School of Chemical and Biomedical Engineering
Format: Final Year Project
Language:English
Published: 2011
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Online Access:http://hdl.handle.net/10356/45716
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-457162023-03-03T15:34:18Z Synthesis of rare earth based nanomaterials Ong, Ling Hui. School of Chemical and Biomedical Engineering Huang Ling DRNTU::Engineering::Materials::Nanostructured materials Discovered just a few years ago, graphene and graphene oxide has received great interest in the scientific community. Graphene oxide, being able to load and deliver drugs opens up possibilities for simultaneous bio-imaging and therapy. Meanwhile, in the near-infrared region, biological samples have low background fluorescence signals, providing high signal to noise ratio. Also, near-infrared radiation can penetrate into sample matrices deeply due to low light scattering. However, there lies the problem of low light scattering and photobleaching Solution came in the form of semiconductor nanocrystals, or quantum dots. Though brighter fluorescence was achieved and them being more resistant to degradation by light, tracking is made difficult due to “blinking” from collective fluorescence. NaYF4: Yb, Er nanocrystals, also quantum dots, were subsequently discovered to solve the problem of “blinking” by traditional quantum dots. NaYF4: Yb, Er nanocrystals are excited by infrared light with each of the quantum dots absorbing and emit fluorescence independently not collectively. Hence, this project aims to incorporate NaYF4: Yb, Er nanocrystals on graphene oxide in hope of combining the properties of both, and also the possibility of improving the aqueous solubility of the nanocrystals. Experiments conducted were able to attach NaYF4: Yb, Er nanocrystals to the graphene surfaces rich in hydroxyl groups giving them high hydrophilicity. Further experiments also suggest a faster and improved way to obtain NaYF4: Yb, ER on expholiated oxidized graphene through solvothermal synthesis. This is opposed to the commonly used hydrothermal synthesis (Modified Hummer’s Method). Bachelor of Engineering (Chemical and Biomolecular Engineering) 2011-06-16T06:50:35Z 2011-06-16T06:50:35Z 2011 2011 Final Year Project (FYP) http://hdl.handle.net/10356/45716 en Nanyang Technological University 21 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::Materials::Nanostructured materials
spellingShingle DRNTU::Engineering::Materials::Nanostructured materials
Ong, Ling Hui.
Synthesis of rare earth based nanomaterials
description Discovered just a few years ago, graphene and graphene oxide has received great interest in the scientific community. Graphene oxide, being able to load and deliver drugs opens up possibilities for simultaneous bio-imaging and therapy. Meanwhile, in the near-infrared region, biological samples have low background fluorescence signals, providing high signal to noise ratio. Also, near-infrared radiation can penetrate into sample matrices deeply due to low light scattering. However, there lies the problem of low light scattering and photobleaching Solution came in the form of semiconductor nanocrystals, or quantum dots. Though brighter fluorescence was achieved and them being more resistant to degradation by light, tracking is made difficult due to “blinking” from collective fluorescence. NaYF4: Yb, Er nanocrystals, also quantum dots, were subsequently discovered to solve the problem of “blinking” by traditional quantum dots. NaYF4: Yb, Er nanocrystals are excited by infrared light with each of the quantum dots absorbing and emit fluorescence independently not collectively. Hence, this project aims to incorporate NaYF4: Yb, Er nanocrystals on graphene oxide in hope of combining the properties of both, and also the possibility of improving the aqueous solubility of the nanocrystals. Experiments conducted were able to attach NaYF4: Yb, Er nanocrystals to the graphene surfaces rich in hydroxyl groups giving them high hydrophilicity. Further experiments also suggest a faster and improved way to obtain NaYF4: Yb, ER on expholiated oxidized graphene through solvothermal synthesis. This is opposed to the commonly used hydrothermal synthesis (Modified Hummer’s Method).
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Ong, Ling Hui.
format Final Year Project
author Ong, Ling Hui.
author_sort Ong, Ling Hui.
title Synthesis of rare earth based nanomaterials
title_short Synthesis of rare earth based nanomaterials
title_full Synthesis of rare earth based nanomaterials
title_fullStr Synthesis of rare earth based nanomaterials
title_full_unstemmed Synthesis of rare earth based nanomaterials
title_sort synthesis of rare earth based nanomaterials
publishDate 2011
url http://hdl.handle.net/10356/45716
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