Davison, Gemma Elizabeth;
(2022)
Hybrid plasmonic nanoparticles for enhanced Raman spectroscopy.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
The enhancement of Raman spectroscopy signals is essential for applications in medical diagnosis and environmental monitoring, with the development of hybrid nanostructures presenting a key solution. In this thesis three different hybrid nanostructures have been synthesised, each consisting of gold nanoparticles (Au NPs) combined either with silver (Ag), tin dioxide (SnO2) or cadmium telluride (CdTe) quantum dots (QDs), to tailor the properties towards enhanced Raman spectroscopy. Gold nanospheres (Au NSs) have been synthesised using the citrate reduction method, while a shape directing agent enabled gold nanotriangles (Au NTs) to be formed. These were combined with Ag, SnO2 or CdTe QDs to create hybrid nanostructures, before being characterised using a range of techniques. For example, ultraviolet-visible spectroscopy allowed changes in the localised surface plasmon resonance to be observed upon the alteration of nanoparticle properties, while transmission electron microscopy imaging provided information about the size, shape, and composition of the hybrid nanostructures. Core@shell Au@Ag NSs aggregated using cucurbit[n]urils were found to be effective surface-enhanced Raman spectroscopy (SERS) substrates, with potential applications in the detection of nucleobases for medical diagnosis. Raman signals of the explosive precursor 2,4-dinitrotoluene were also successfully enhanced using Au NT-SnO2 nanostructures, which enabled both hybrid SERS detection due to intrinsic oxygen vacancies in the SnO2, and photo-induced enhanced Raman spectroscopy (PIERS) detection upon ultraviolet irradiation. Finally, charge transfer between plasmonic NPs and CdTe QDs was explored, with initial tests carried out to explore the potential for applications in enhanced Raman spectroscopy.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Hybrid plasmonic nanoparticles for enhanced Raman spectroscopy |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2022. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10143201 |
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