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Title: Energy transfer in biomimetic and biosensing molecular nanomaterials
Author: Chen, Wei-Han
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2013
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This thesis is concerned with ultrafast photophysics and excitation energy transfer in biomimetic and bio-sensing molecular nanomaterials, which have been investigated using timeresolved photoluminescence spectroscopy. Artificially-synthesised fully 7r-conjugated nanorings with 6-24 units of porphyrins incorporated have demonstrated remarkable full delocalisation of the absorbing excited state across the entire ring on an ultrafast timescale. The largest ring of 24 porphyrin units with a diameter of,...., 10 urn is the largest man-made molecular nanaring at present. The constraint that the lowest electronic transition is forbidden due to their high molecular symmetries is released by static and dynamic distortions in the solution. T hese findings provide promising opportunities for using these man-made light-harvesting materials that match the efficiency of their natural counterparts in technological applications. Self-assembled organic fluorescent nanoparticles (NPs) formed of amphiphilic monomers with targeting ligands exhibit potential to be used in bio-sensing applications. Homotransfer and heterotransfer of excitation energy in nanoparticles have been investigated, where mannose covalently linked on Ampl-B monomers provide binding sites for Concanavalin A which is attached with energy acceptors. Increasing the molar ratios of Ampl-B-mannose and Amp3-B can increase the binding sites and forming directional energetic cascades towards the NP surface, respectively. However, the amount of these two monomers must be optimised in order to reach the highest donor-acceptor energy transfer rate in the system. The works in this thesis have explored the fundamental optical properties of new Of ganic nanomaterials, which provide opportunities for biological relevant and light-harvesting applications.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available