Formation and electrical interfacing of nanocrystal-molecule nanostructures

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dc.contributor.advisor Quinn, Aidan J. Sassiat, Nicolas 2011-09-29T15:50:26Z 2011-09-29T15:50:26Z 2011-06 2011-07-01
dc.identifier.citation Sassiat, N.P. 2011. Formation and electrical interfacing of nanocrystal-molecule nanostructures. PhD Thesis, University College Cork. en
dc.description.abstract The objective of this thesis work is to develop methods for forming and interfacing nanocrystal-molecule nanostructures in order to explore their electrical transport properties in various controlled environments. This work demonstrates the potential of nanocrystal assemblies for laterally contacting molecules for electronic transport measurements. We first propose a phenomenological model based on rate equations for the formation of hybrid nanocrystal-molecule (respectively: 20 nm – 1.2 nm) nanostructures in solution. We then concentrate on nanocrystals (~ 60 nm) assembled between nano-gaps (~ 40 nm) as a contacting strategy for the measurement of electronic transport properties of thiophene-terminated conjugated molecules (1.5 nm long) in a two-terminal configuration, under vacuum conditions. Similar devices were also probed with a three-terminal configuration using thiophene-terminated oxidation-reduction active molecules (1.8 nm long) in liquid medium for the demonstration of the electrolytic gating technique. The experimental and modelling work presented in this thesis project brings into light physical and chemical processes taking place at the extremely narrow (~1 nm separation) and curved interface between two nanocrystals or one nanocrystal and a grain of a metallic electrode. The formation of molecular bridges at this kind of interface necessitates molecules to diffuse from a large liquid reservoir into the region in the first place. Molecular bonding must occur to the surface for both molecular ends: this is a low yield statistical process in itself as it depends on orientation of surfaces, on steric hindrance at the surface and on binding energies. On the other hand, the experimental work also touched the importance of the competition between potentially immiscible liquids in systems such that (organo-)metallic molecules solvated by organic solvent in water and organic solvent in contact with hydrated citrate stabilised nanocrystals dispersed in solutions or assembled between electrodes from both experimental and simulations point of view. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2011, Nicolas Sassiat. en
dc.rights.uri en
dc.subject Nanostructure formation en
dc.subject Electrolytic gating en
dc.subject.lcsh Molecular electronics en
dc.subject.lcsh Nanostructures en
dc.subject.lcsh Nanocrystals en
dc.subject.lcsh Molecules en
dc.title Formation and electrical interfacing of nanocrystal-molecule nanostructures en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.description.version Accepted Version en
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder European Commission en
dc.description.status Not peer reviewed en Physics en Tyndall en

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